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data-analytics-event="{&quot;action&quot;:&quot;view_all_features&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;platform&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;view_all_features_link_platform_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">View all features</span><svg data-component="Octicon" aria-hidden="true" focusable="false" class="octicon octicon-chevron-right NavLink-module__arrowIcon__amekg" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L9.94 8 6.22 4.28a.75.75 0 0 1 0-1.06Z"></path></svg></a></div></div></div></li><li><div class="NavDropdown-module__container__l2YeI js-details-container js-header-menu-item"><button type="button" class="NavDropdown-module__button__PEHWX js-details-target" aria-expanded="false">Solutions<svg data-component="Octicon" aria-hidden="true" focusable="false" class="octicon octicon-chevron-right NavDropdown-module__buttonIcon__Tkl8_" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L9.94 8 6.22 4.28a.75.75 0 0 1 0-1.06Z"></path></svg></button><div class="NavDropdown-module__dropdown__xm1jd"><ul class="NavDropdown-module__list__zuCgG"><li><div class="NavGroup-module__group__W8SqJ"><span class="NavGroup-module__title__Wzxz2" id="_R_5ib_">BY COMPANY SIZE</span><ul class="NavGroup-module__list__UCOFy" aria-labelledby="_R_5ib_"><li><a href="https://github.com/enterprise" data-analytics-event="{&quot;action&quot;:&quot;enterprises&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;enterprises_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Enterprises</span></a></li><li><a href="https://github.com/team" data-analytics-event="{&quot;action&quot;:&quot;small_and_medium_teams&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;small_and_medium_teams_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Small and medium teams</span></a></li><li><a href="https://github.com/enterprise/startups" data-analytics-event="{&quot;action&quot;:&quot;startups&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;startups_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Startups</span></a></li><li><a href="https://github.com/solutions/industry/nonprofits" data-analytics-event="{&quot;action&quot;:&quot;nonprofits&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;nonprofits_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Nonprofits</span></a></li></ul></div></li><li><div class="NavGroup-module__group__W8SqJ"><span class="NavGroup-module__title__Wzxz2" id="_R_9ib_">BY USE CASE</span><ul class="NavGroup-module__list__UCOFy" aria-labelledby="_R_9ib_"><li><a href="https://github.com/solutions/use-case/app-modernization" data-analytics-event="{&quot;action&quot;:&quot;app_modernization&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;app_modernization_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">App Modernization</span></a></li><li><a href="https://github.com/solutions/use-case/devsecops" data-analytics-event="{&quot;action&quot;:&quot;devsecops&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;devsecops_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">DevSecOps</span></a></li><li><a href="https://github.com/solutions/use-case/devops" data-analytics-event="{&quot;action&quot;:&quot;devops&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;devops_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">DevOps</span></a></li><li><a href="https://github.com/solutions/use-case/ci-cd" data-analytics-event="{&quot;action&quot;:&quot;ci/cd&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;ci/cd_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">CI/CD</span></a></li><li><a href="https://github.com/solutions/use-case" data-analytics-event="{&quot;action&quot;:&quot;view_all_use_cases&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;view_all_use_cases_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">View all use cases</span><svg data-component="Octicon" aria-hidden="true" focusable="false" class="octicon octicon-chevron-right NavLink-module__arrowIcon__amekg" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L9.94 8 6.22 4.28a.75.75 0 0 1 0-1.06Z"></path></svg></a></li></ul></div></li><li><div class="NavGroup-module__group__W8SqJ"><span class="NavGroup-module__title__Wzxz2" id="_R_dib_">BY INDUSTRY</span><ul class="NavGroup-module__list__UCOFy" aria-labelledby="_R_dib_"><li><a href="https://github.com/solutions/industry/healthcare" data-analytics-event="{&quot;action&quot;:&quot;healthcare&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;healthcare_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Healthcare</span></a></li><li><a href="https://github.com/solutions/industry/financial-services" data-analytics-event="{&quot;action&quot;:&quot;financial_services&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;financial_services_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Financial services</span></a></li><li><a href="https://github.com/solutions/industry/manufacturing" data-analytics-event="{&quot;action&quot;:&quot;manufacturing&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;manufacturing_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Manufacturing</span></a></li><li><a href="https://github.com/solutions/industry/government" data-analytics-event="{&quot;action&quot;:&quot;government&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;government_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Government</span></a></li><li><a href="https://github.com/solutions/industry" data-analytics-event="{&quot;action&quot;:&quot;view_all_industries&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;view_all_industries_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">View all industries</span><svg data-component="Octicon" aria-hidden="true" focusable="false" class="octicon octicon-chevron-right NavLink-module__arrowIcon__amekg" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L9.94 8 6.22 4.28a.75.75 0 0 1 0-1.06Z"></path></svg></a></li></ul></div></li></ul><div class="NavDropdown-module__trailingLinkContainer__VgJGL"><a href="https://github.com/solutions" data-analytics-event="{&quot;action&quot;:&quot;view_all_solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;view_all_solutions_link_solutions_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">View all solutions</span><svg data-component="Octicon" aria-hidden="true" focusable="false" class="octicon octicon-chevron-right NavLink-module__arrowIcon__amekg" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L9.94 8 6.22 4.28a.75.75 0 0 1 0-1.06Z"></path></svg></a></div></div></div></li><li><div class="NavDropdown-module__container__l2YeI js-details-container js-header-menu-item"><button type="button" class="NavDropdown-module__button__PEHWX js-details-target" aria-expanded="false">Resources<svg data-component="Octicon" aria-hidden="true" focusable="false" class="octicon octicon-chevron-right NavDropdown-module__buttonIcon__Tkl8_" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L9.94 8 6.22 4.28a.75.75 0 0 1 0-1.06Z"></path></svg></button><div class="NavDropdown-module__dropdown__xm1jd"><ul class="NavDropdown-module__list__zuCgG"><li><div class="NavGroup-module__group__W8SqJ"><span class="NavGroup-module__title__Wzxz2" id="_R_5jb_">EXPLORE BY TOPIC</span><ul class="NavGroup-module__list__UCOFy" aria-labelledby="_R_5jb_"><li><a href="https://github.com/resources/articles?topic=ai" data-analytics-event="{&quot;action&quot;:&quot;ai&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;ai_link_resources_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">AI</span></a></li><li><a href="https://github.com/resources/articles?topic=software-development" data-analytics-event="{&quot;action&quot;:&quot;software_development&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;software_development_link_resources_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Software Development</span></a></li><li><a href="https://github.com/resources/articles?topic=devops" data-analytics-event="{&quot;action&quot;:&quot;devops&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;devops_link_resources_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">DevOps</span></a></li><li><a href="https://github.com/resources/articles?topic=security" data-analytics-event="{&quot;action&quot;:&quot;security&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;security_link_resources_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Security</span></a></li><li><a href="https://github.com/resources/articles" data-analytics-event="{&quot;action&quot;:&quot;view_all_topics&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;view_all_topics_link_resources_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">View all topics</span><svg data-component="Octicon" aria-hidden="true" focusable="false" class="octicon octicon-chevron-right NavLink-module__arrowIcon__amekg" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L9.94 8 6.22 4.28a.75.75 0 0 1 0-1.06Z"></path></svg></a></li></ul></div></li><li><div class="NavGroup-module__group__W8SqJ"><span class="NavGroup-module__title__Wzxz2" id="_R_9jb_">EXPLORE BY TYPE</span><ul class="NavGroup-module__list__UCOFy" aria-labelledby="_R_9jb_"><li><a href="https://github.com/customer-stories" data-analytics-event="{&quot;action&quot;:&quot;customer_stories&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;customer_stories_link_resources_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Customer stories</span></a></li><li><a href="https://github.com/resources/events" data-analytics-event="{&quot;action&quot;:&quot;events__webinars&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;events__webinars_link_resources_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Events &amp; webinars</span></a></li><li><a href="https://github.com/resources/whitepapers" data-analytics-event="{&quot;action&quot;:&quot;ebooks__reports&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;ebooks__reports_link_resources_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Ebooks &amp; reports</span></a></li><li><a href="https://github.com/solutions/executive-insights" data-analytics-event="{&quot;action&quot;:&quot;business_insights&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;business_insights_link_resources_navbar&quot;}" class="NavLink-module__link__EG3d4"><span class="NavLink-module__title__Q7t0p">Business insights</span></a></li><li><a href="https://skills.github.com" data-analytics-event="{&quot;action&quot;:&quot;github_skills&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;location&quot;:&quot;navbar&quot;,&quot;label&quot;:&quot;github_skills_link_resources_navbar&quot;}" class="NavLink-module__link__EG3d4" target="_blank" rel="noreferrer"><span class="NavLink-module__title__Q7t0p">GitHub Skills</span><svg data-component="Octicon" aria-hidden="true" focusable="false" class="octicon octicon-link-external NavLink-module__externalIcon__eWIry" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 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        <div data-target="query-builder.styledInputContainer" class="QueryBuilder-StyledInputContainer">
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      <template id="search-icon">
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</svg>
</template>

<template id="code-icon">
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<template id="file-code-icon">
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</template>

<template id="history-icon">
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</template>

<template id="repo-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo">
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<template id="bookmark-icon">
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<template id="plus-circle-icon">
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<template id="circle-icon">
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<template id="trash-icon">
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<template id="team-icon">
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<template id="project-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-project">
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<template id="pencil-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-pencil">
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<template id="copilot-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copilot">
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<template id="copilot-error-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copilot-error">
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<template id="workflow-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-workflow">
    <path d="M0 1.75C0 .784.784 0 1.75 0h3.5C6.216 0 7 .784 7 1.75v3.5A1.75 1.75 0 0 1 5.25 7H4v4a1 1 0 0 0 1 1h4v-1.25C9 9.784 9.784 9 10.75 9h3.5c.966 0 1.75.784 1.75 1.75v3.5A1.75 1.75 0 0 1 14.25 16h-3.5A1.75 1.75 0 0 1 9 14.25v-.75H5A2.5 2.5 0 0 1 2.5 11V7h-.75A1.75 1.75 0 0 1 0 5.25Zm1.75-.25a.25.25 0 0 0-.25.25v3.5c0 .138.112.25.25.25h3.5a.25.25 0 0 0 .25-.25v-3.5a.25.25 0 0 0-.25-.25Zm9 9a.25.25 0 0 0-.25.25v3.5c0 .138.112.25.25.25h3.5a.25.25 0 0 0 .25-.25v-3.5a.25.25 0 0 0-.25-.25Z"></path>
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<template id="book-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-book">
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<template id="code-review-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-code-review">
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<template id="codespaces-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-codespaces">
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<template id="comment-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-comment">
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<template id="comment-discussion-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-comment-discussion">
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<template id="organization-icon">
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<template id="rocket-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-rocket">
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<template id="shield-check-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-shield-check">
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<template id="heart-icon">
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<template id="server-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-server">
    <path d="M1.75 1h12.5c.966 0 1.75.784 1.75 1.75v4c0 .372-.116.717-.314 1 .198.283.314.628.314 1v4a1.75 1.75 0 0 1-1.75 1.75H1.75A1.75 1.75 0 0 1 0 12.75v-4c0-.358.109-.707.314-1a1.739 1.739 0 0 1-.314-1v-4C0 1.784.784 1 1.75 1ZM1.5 2.75v4c0 .138.112.25.25.25h12.5a.25.25 0 0 0 .25-.25v-4a.25.25 0 0 0-.25-.25H1.75a.25.25 0 0 0-.25.25Zm.25 5.75a.25.25 0 0 0-.25.25v4c0 .138.112.25.25.25h12.5a.25.25 0 0 0 .25-.25v-4a.25.25 0 0 0-.25-.25ZM7 4.75A.75.75 0 0 1 7.75 4h4.5a.75.75 0 0 1 0 1.5h-4.5A.75.75 0 0 1 7 4.75ZM7.75 10h4.5a.75.75 0 0 1 0 1.5h-4.5a.75.75 0 0 1 0-1.5ZM3 4.75A.75.75 0 0 1 3.75 4h.5a.75.75 0 0 1 0 1.5h-.5A.75.75 0 0 1 3 4.75ZM3.75 10h.5a.75.75 0 0 1 0 1.5h-.5a.75.75 0 0 1 0-1.5Z"></path>
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<template id="globe-icon">
  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-globe">
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        <div class="position-relative">
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          <div class="form-group">
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              id="custom_scope_query"
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          <p class="text-small color-fg-muted">
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src=\"https://camo.githubusercontent.com/9007feca68c6385b2ef81e31d8e08bc274bddb965c1441fe437d7c35ff2e2130/68747470733a2f2f636f766572616c6c732e696f2f7265706f732f6769746875622f446972747948616972792f6173796e632d6d757465782f62616467652e7376673f6272616e63683d6d6173746572\" alt=\"Coverage Status\" data-canonical-src=\"https://coveralls.io/repos/github/DirtyHairy/async-mutex/badge.svg?branch=master\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat is it?\u003c/h1\u003e\u003ca id=\"user-content-what-is-it\" class=\"anchor\" aria-label=\"Permalink: What is it?\" href=\"#what-is-it\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis package implements primitives for synchronizing asynchronous operations in\nJavascript.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMutex\u003c/h2\u003e\u003ca id=\"user-content-mutex\" class=\"anchor\" aria-label=\"Permalink: Mutex\" href=\"#mutex\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe term \"mutex\" usually refers to a data structure used to synchronize\nconcurrent processes running on different threads. For example, before accessing\na non-threadsafe resource, a thread will lock the mutex. This is guaranteed\nto block the thread until no other thread holds a lock on the mutex and thus\nenforces exclusive access to the resource. Once the operation is complete, the\nthread releases the lock, allowing other threads to acquire a lock and access the\nresource.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhile Javascript is strictly single-threaded, the asynchronous nature of its\nexecution model allows for race conditions that require similar synchronization\nprimitives. Consider for example a library communicating with a web worker that\nneeds to exchange several subsequent messages with the worker in order to achieve\na task. As these messages are exchanged in an asynchronous manner, it is perfectly\npossible that the library is called again during this process. Depending on the\nway state is handled during the async process, this will lead to race conditions\nthat are hard to fix and even harder to track down.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis library solves the problem by applying the concept of mutexes to Javascript.\nLocking the mutex will return a promise that resolves once the mutex becomes\navailable. Once the async process is complete (usually taking multiple\nspins of the event loop), a callback supplied to the caller should be called in order\nto release the mutex, allowing the next scheduled worker to execute.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSemaphore\u003c/h1\u003e\u003ca id=\"user-content-semaphore\" class=\"anchor\" aria-label=\"Permalink: Semaphore\" href=\"#semaphore\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eImagine a situation where you need to control access to several instances of\na shared resource. For example, you might want to distribute images between several\nworker processes that perform transformations, or you might want to create a web\ncrawler that performs a defined number of requests in parallel.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA semaphore is a data structure that is initialized with an arbitrary integer value and that\ncan be locked multiple times.\nAs long as the semaphore value is positive, locking it will return the current value\nand the locking process will continue execution immediately; the semaphore will\nbe decremented upon locking. Releasing the lock will increment the semaphore again.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOnce the semaphore has reached zero, the next process that attempts to acquire a lock\nwill be suspended until another process releases its lock and this increments the semaphore\nagain.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis library provides a semaphore implementation for Javascript that is similar to the\nmutex implementation described above.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow to use it?\u003c/h1\u003e\u003ca id=\"user-content-how-to-use-it\" class=\"anchor\" aria-label=\"Permalink: How to use it?\" href=\"#how-to-use-it\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eInstallation\u003c/h2\u003e\u003ca id=\"user-content-installation\" class=\"anchor\" aria-label=\"Permalink: Installation\" href=\"#installation\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can install the library into your project via npm\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"npm install async-mutex\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003enpm install async-mutex\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe library is written in TypeScript and will work in any environment that\nsupports ES5, ES6 promises and \u003ccode\u003eArray.isArray\u003c/code\u003e. On ancient browsers,\na shim can be used (e.g. \u003ca href=\"https://github.com/zloirock/core-js\"\u003ecore-js\u003c/a\u003e).\nNo external typings are required for using this library with\nTypeScript (version \u0026gt;= 2).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eStarting with Node 12.16 and 13.7, native ES6 style imports are supported.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eWARNING:\u003c/strong\u003e Node 13 versions \u0026lt; 13.2.0 fail to import this package correctly.\nNode 12 and earlier are fine, as are newer versions of Node 13.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eImporting\u003c/h2\u003e\u003ca id=\"user-content-importing\" class=\"anchor\" aria-label=\"Permalink: Importing\" href=\"#importing\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCommonJS:\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const {Mutex, Semaphore, withTimeout} = require('async-mutex');\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003eMutex\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e Semaphore\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e withTimeout\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003erequire\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'async-mutex'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eES6:\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {Mutex, Semaphore, withTimeout} from 'async-mutex';\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-v\"\u003eMutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ewithTimeout\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'async-mutex'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eTypeScript:\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {Mutex, MutexInterface, Semaphore, SemaphoreInterface, withTimeout} from 'async-mutex';\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-v\"\u003eMutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eMutexInterface\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSemaphoreInterface\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ewithTimeout\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'async-mutex'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWith the latest version of Node, native ES6 style imports are supported.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMutex API\u003c/h2\u003e\u003ca id=\"user-content-mutex-api\" class=\"anchor\" aria-label=\"Permalink: Mutex API\" href=\"#mutex-api\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCreating\u003c/h3\u003e\u003ca id=\"user-content-creating\" class=\"anchor\" aria-label=\"Permalink: Creating\" href=\"#creating\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const mutex = new Mutex();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emutex\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eMutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCreate a new mutex.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSynchronized code execution\u003c/h3\u003e\u003ca id=\"user-content-synchronized-code-execution\" class=\"anchor\" aria-label=\"Permalink: Synchronized code execution\" href=\"#synchronized-code-execution\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePromise style:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"mutex\n    .runExclusive(() =\u0026gt; {\n        // ...\n    })\n    .then((result) =\u0026gt; {\n        // ...\n    });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003emutex\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erunExclusive\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ethen\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003easync/await:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"await mutex.runExclusive(async () =\u0026gt; {\n    // ...\n});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erunExclusive\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003easync\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n    \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003erunExclusive\u003c/code\u003e schedules the supplied callback to be run once the mutex is unlocked.\nThe function may return a promise. Once the promise is resolved or rejected (or immediately after\nexecution if an immediate value was returned),\nthe mutex is released. \u003ccode\u003erunExclusive\u003c/code\u003e returns a promise that adopts the state of the function result.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe mutex is released and the result rejected if an exception occurs during execution\nof the callback.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eManual locking / releasing\u003c/h3\u003e\u003ca id=\"user-content-manual-locking--releasing\" class=\"anchor\" aria-label=\"Permalink: Manual locking / releasing\" href=\"#manual-locking--releasing\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePromise style:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"mutex\n    .acquire()\n    .then(function(release) {\n        // ...\n\n        release();\n    });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003emutex\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eacquire\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ethen\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003erelease\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n\n        \u003cspan class=\"pl-en\"\u003erelease\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003easync/await:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const release = await mutex.acquire();\ntry {\n    // ...\n} finally {\n    release();\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003erelease\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eacquire\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n    \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efinally\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n    \u003cspan class=\"pl-en\"\u003erelease\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003eacquire\u003c/code\u003e returns an (ES6) promise that will resolve as soon as the mutex is\navailable. The promise resolves with a function \u003ccode\u003erelease\u003c/code\u003e that\nmust be called once the mutex should be released again. The \u003ccode\u003erelease\u003c/code\u003e callback\nis idempotent.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eIMPORTANT:\u003c/strong\u003e Failure to call \u003ccode\u003erelease\u003c/code\u003e will hold the mutex locked and will\nlikely deadlock the application. Make sure to call \u003ccode\u003erelease\u003c/code\u003e under all circumstances\nand handle exceptions accordingly.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUnscoped release\u003c/h3\u003e\u003ca id=\"user-content-unscoped-release\" class=\"anchor\" aria-label=\"Permalink: Unscoped release\" href=\"#unscoped-release\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAs an alternative to calling the \u003ccode\u003erelease\u003c/code\u003e callback returned by \u003ccode\u003eacquire\u003c/code\u003e, the mutex\ncan be released by calling \u003ccode\u003erelease\u003c/code\u003e directly on it:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"mutex.release();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003emutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erelease\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eChecking whether the mutex is locked\u003c/h3\u003e\u003ca id=\"user-content-checking-whether-the-mutex-is-locked\" class=\"anchor\" aria-label=\"Permalink: Checking whether the mutex is locked\" href=\"#checking-whether-the-mutex-is-locked\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"mutex.isLocked();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003emutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eisLocked\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCancelling pending locks\u003c/h3\u003e\u003ca id=\"user-content-cancelling-pending-locks\" class=\"anchor\" aria-label=\"Permalink: Cancelling pending locks\" href=\"#cancelling-pending-locks\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePending locks can be cancelled by calling \u003ccode\u003ecancel()\u003c/code\u003e on the mutex. This will reject\nall pending locks with \u003ccode\u003eE_CANCELED\u003c/code\u003e:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePromise style:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {E_CANCELED} from 'async-mutex';\n\nmutex\n    .runExclusive(() =\u0026gt; {\n        // ...\n    })\n    .then(() =\u0026gt; {\n        // ...\n    })\n    .catch(e =\u0026gt; {\n        if (e === E_CANCELED) {\n            // ...\n        }\n    });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eE_CANCELED\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'async-mutex'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-s1\"\u003emutex\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erunExclusive\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ethen\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecatch\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e===\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eE_CANCELED\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n            \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n        \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003easync/await:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {E_CANCELED} from 'async-mutex';\n\ntry {\n    await mutex.runExclusive(() =\u0026gt; {\n        // ...\n    });\n} catch (e) {\n    if (e === E_CANCELED) {\n        // ...\n    }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eE_CANCELED\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'async-mutex'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n    \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erunExclusive\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n    \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e===\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eE_CANCELED\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis works with \u003ccode\u003eacquire\u003c/code\u003e, too:\nif \u003ccode\u003eacquire\u003c/code\u003e is used for locking, the resulting promise will reject with \u003ccode\u003eE_CANCELED\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe error that is thrown can be customized by passing a different error to the \u003ccode\u003eMutex\u003c/code\u003e\nconstructor:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const mutex = new Mutex(new Error('fancy custom error'));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emutex\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eMutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eError\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'fancy custom error'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that while all pending locks are cancelled, a currently held lock will not be\nrevoked. In consequence, the mutex may not be available even after \u003ccode\u003ecancel()\u003c/code\u003e has been called.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWaiting until the mutex is available\u003c/h3\u003e\u003ca id=\"user-content-waiting-until-the-mutex-is-available\" class=\"anchor\" aria-label=\"Permalink: Waiting until the mutex is available\" href=\"#waiting-until-the-mutex-is-available\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can wait until the mutex is available without locking it by calling \u003ccode\u003ewaitForUnlock()\u003c/code\u003e.\nThis will return a promise that resolve once the mutex can be acquired again. This operation\nwill not lock the mutex, and there is no guarantee that the mutex will still be available\nonce an async barrier has been encountered.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePromise style:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"mutex\n    .waitForUnlock()\n    .then(() =\u0026gt; {\n        // ...\n    });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003emutex\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ewaitForUnlock\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ethen\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAsync/await:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"await mutex.waitForUnlock();\n// ...\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ewaitForUnlock\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSemaphore API\u003c/h2\u003e\u003ca id=\"user-content-semaphore-api\" class=\"anchor\" aria-label=\"Permalink: Semaphore API\" href=\"#semaphore-api\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCreating\u003c/h3\u003e\u003ca id=\"user-content-creating-1\" class=\"anchor\" aria-label=\"Permalink: Creating\" href=\"#creating-1\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const semaphore = new Semaphore(initialValue);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003einitialValue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCreates a new semaphore. \u003ccode\u003einitialValue\u003c/code\u003e is an arbitrary integer that defines the\ninitial value of the semaphore.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSynchronized code execution\u003c/h3\u003e\u003ca id=\"user-content-synchronized-code-execution-1\" class=\"anchor\" aria-label=\"Permalink: Synchronized code execution\" href=\"#synchronized-code-execution-1\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePromise style:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"semaphore\n    .runExclusive(function(value) {\n        // ...\n    })\n    .then(function(result) {\n        // ...\n    });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erunExclusive\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ethen\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003easync/await:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"await semaphore.runExclusive(async (value) =\u0026gt; {\n    // ...\n});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erunExclusive\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003easync\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n    \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003erunExclusive\u003c/code\u003e schedules the supplied callback to be run once the semaphore is available.\nThe callback will receive the current value of the semaphore as its argument.\nThe function may return a promise. Once the promise is resolved or rejected (or immediately after\nexecution if an immediate value was returned),\nthe semaphore is released. \u003ccode\u003erunExclusive\u003c/code\u003e returns a promise that adopts the state of the function result.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe semaphore is released and the result rejected if an exception occurs during execution\nof the callback.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003erunExclusive\u003c/code\u003e accepts a first optional argument \u003ccode\u003eweight\u003c/code\u003e. Specifying a \u003ccode\u003eweight\u003c/code\u003e will decrement the\nsemaphore by the specified value, and the callback will only be invoked once the semaphore's\nvalue greater or equal to \u003ccode\u003eweight\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003erunExclusive\u003c/code\u003e accepts a second optional argument \u003ccode\u003epriority\u003c/code\u003e. Specifying a greater value for \u003ccode\u003epriority\u003c/code\u003e\ntells the scheduler to run this task before other tasks. \u003ccode\u003epriority\u003c/code\u003e can be any real number. The default\nis zero.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eManual locking / releasing\u003c/h3\u003e\u003ca id=\"user-content-manual-locking--releasing-1\" class=\"anchor\" aria-label=\"Permalink: Manual locking / releasing\" href=\"#manual-locking--releasing-1\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePromise style:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"semaphore\n    .acquire()\n    .then(function([value, release]) {\n        // ...\n\n        release();\n    });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eacquire\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ethen\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003erelease\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n\n        \u003cspan class=\"pl-en\"\u003erelease\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003easync/await:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const [value, release] = await semaphore.acquire();\ntry {\n    // ...\n} finally {\n    release();\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003erelease\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eacquire\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n    \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efinally\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n    \u003cspan class=\"pl-en\"\u003erelease\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003eacquire\u003c/code\u003e returns an (ES6) promise that will resolve as soon as the semaphore is\navailable. The promise resolves to an array with the\nfirst entry being the current value of the semaphore, and the second value a\nfunction that must be called to release the semaphore once the critical operation\nhas completed. The \u003ccode\u003erelease\u003c/code\u003e callback is idempotent.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eIMPORTANT:\u003c/strong\u003e Failure to call \u003ccode\u003erelease\u003c/code\u003e will hold the semaphore locked and will\nlikely deadlock the application. Make sure to call \u003ccode\u003erelease\u003c/code\u003e under all circumstances\nand handle exceptions accordingly.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003eacquire\u003c/code\u003e accepts a first optional argument \u003ccode\u003eweight\u003c/code\u003e. Specifying a \u003ccode\u003eweight\u003c/code\u003e will decrement the\nsemaphore by the specified value, and the semaphore will only be acquired once its\nvalue is greater or equal to \u003ccode\u003eweight\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003eacquire\u003c/code\u003e accepts a second optional argument \u003ccode\u003epriority\u003c/code\u003e. Specifying a greater value for \u003ccode\u003epriority\u003c/code\u003e\ntells the scheduler to release the semaphore to the caller before other callers. \u003ccode\u003epriority\u003c/code\u003e can be\nany real number. The default is zero.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUnscoped release\u003c/h3\u003e\u003ca id=\"user-content-unscoped-release-1\" class=\"anchor\" aria-label=\"Permalink: Unscoped release\" href=\"#unscoped-release-1\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAs an alternative to calling the \u003ccode\u003erelease\u003c/code\u003e callback returned by \u003ccode\u003eacquire\u003c/code\u003e, the semaphore\ncan be released by calling \u003ccode\u003erelease\u003c/code\u003e directly on it:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"semaphore.release();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erelease\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003erelease\u003c/code\u003e accepts an optional argument \u003ccode\u003eweight\u003c/code\u003e and increments the semaphore accordingly.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eIMPORTANT:\u003c/strong\u003e Releasing a previously acquired semaphore with the releaser that was\nreturned by acquire will automatically increment the semaphore by the correct weight. If\nyou release by calling the unscoped \u003ccode\u003erelease\u003c/code\u003e you have to supply the correct weight\nyourself!\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGetting the semaphore value\u003c/h3\u003e\u003ca id=\"user-content-getting-the-semaphore-value\" class=\"anchor\" aria-label=\"Permalink: Getting the semaphore value\" href=\"#getting-the-semaphore-value\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"semaphore.getValue()\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003egetValue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eChecking whether the semaphore is locked\u003c/h3\u003e\u003ca id=\"user-content-checking-whether-the-semaphore-is-locked\" class=\"anchor\" aria-label=\"Permalink: Checking whether the semaphore is locked\" href=\"#checking-whether-the-semaphore-is-locked\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"semaphore.isLocked();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eisLocked\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe semaphore is considered to be locked if its value is either zero or negative.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSetting the semaphore value\u003c/h3\u003e\u003ca id=\"user-content-setting-the-semaphore-value\" class=\"anchor\" aria-label=\"Permalink: Setting the semaphore value\" href=\"#setting-the-semaphore-value\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe value of a semaphore can be set directly to a desired value. A positive value will\ncause the semaphore to schedule any pending waiters accordingly.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"semaphore.setValue();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003esetValue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCancelling pending locks\u003c/h3\u003e\u003ca id=\"user-content-cancelling-pending-locks-1\" class=\"anchor\" aria-label=\"Permalink: Cancelling pending locks\" href=\"#cancelling-pending-locks-1\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePending locks can be cancelled by calling \u003ccode\u003ecancel()\u003c/code\u003e on the semaphore. This will reject\nall pending locks with \u003ccode\u003eE_CANCELED\u003c/code\u003e:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePromise style:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {E_CANCELED} from 'async-mutex';\n\nsemaphore\n    .runExclusive(() =\u0026gt; {\n        // ...\n    })\n    .then(() =\u0026gt; {\n        // ...\n    })\n    .catch(e =\u0026gt; {\n        if (e === E_CANCELED) {\n            // ...\n        }\n    });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eE_CANCELED\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'async-mutex'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erunExclusive\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ethen\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecatch\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e===\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eE_CANCELED\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n            \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n        \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003easync/await:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {E_CANCELED} from 'async-mutex';\n\ntry {\n    await semaphore.runExclusive(() =\u0026gt; {\n        // ...\n    });\n} catch (e) {\n    if (e === E_CANCELED) {\n        // ...\n    }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eE_CANCELED\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'async-mutex'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n    \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erunExclusive\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n    \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e===\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eE_CANCELED\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis works with \u003ccode\u003eacquire\u003c/code\u003e, too:\nif \u003ccode\u003eacquire\u003c/code\u003e is used for locking, the resulting promise will reject with \u003ccode\u003eE_CANCELED\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe error that is thrown can be customized by passing a different error to the \u003ccode\u003eSemaphore\u003c/code\u003e\nconstructor:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const semaphore = new Semaphore(2, new Error('fancy custom error'));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eError\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'fancy custom error'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that while all pending locks are cancelled, any currently held locks will not be\nrevoked. In consequence, the semaphore may not be available even after \u003ccode\u003ecancel()\u003c/code\u003e has been called.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWaiting until the semaphore is available\u003c/h3\u003e\u003ca id=\"user-content-waiting-until-the-semaphore-is-available\" class=\"anchor\" aria-label=\"Permalink: Waiting until the semaphore is available\" href=\"#waiting-until-the-semaphore-is-available\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can wait until the semaphore is available without locking it by calling \u003ccode\u003ewaitForUnlock()\u003c/code\u003e.\nThis will return a promise that resolve once the semaphore can be acquired again. This operation\nwill not lock the semaphore, and there is no guarantee that the semaphore will still be available\nonce an async barrier has been encountered.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePromise style:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"semaphore\n    .waitForUnlock()\n    .then(() =\u0026gt; {\n        // ...\n    });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ewaitForUnlock\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ethen\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAsync/await:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"await semaphore.waitForUnlock();\n// ...\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ewaitForUnlock\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003ewaitForUnlock\u003c/code\u003e accepts optional arguments \u003ccode\u003eweight\u003c/code\u003e and \u003ccode\u003epriority\u003c/code\u003e. The promise will resolve as soon\nas it is possible to \u003ccode\u003eacquire\u003c/code\u003e the semaphore with the given weight and priority. Scheduled tasks with\nthe greatest \u003ccode\u003epriority\u003c/code\u003e values execute first.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLimiting the time waiting for a mutex or semaphore to become available\u003c/h2\u003e\u003ca id=\"user-content-limiting-the-time-waiting-for-a-mutex-or-semaphore-to-become-available\" class=\"anchor\" aria-label=\"Permalink: Limiting the time waiting for a mutex or semaphore to become available\" href=\"#limiting-the-time-waiting-for-a-mutex-or-semaphore-to-become-available\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSometimes it is desirable to limit the time a program waits for a mutex or\nsemaphore to become available. The \u003ccode\u003ewithTimeout\u003c/code\u003e decorator can be applied\nto both semaphores and mutexes and changes the behavior of \u003ccode\u003eacquire\u003c/code\u003e and\n\u003ccode\u003erunExclusive\u003c/code\u003e accordingly.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {withTimeout, E_TIMEOUT} from 'async-mutex';\n\nconst mutexWithTimeout = withTimeout(new Mutex(), 100);\nconst semaphoreWithTimeout = withTimeout(new Semaphore(5), 100);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ewithTimeout\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eE_TIMEOUT\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'async-mutex'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emutexWithTimeout\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003ewithTimeout\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eMutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e100\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esemaphoreWithTimeout\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003ewithTimeout\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e5\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e100\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe API of the decorated mutex or semaphore is unchanged.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe second argument of \u003ccode\u003ewithTimeout\u003c/code\u003e is the timeout in milliseconds. After the\ntimeout is exceeded, the promise returned by \u003ccode\u003eacquire\u003c/code\u003e and \u003ccode\u003erunExclusive\u003c/code\u003e will\nreject with \u003ccode\u003eE_TIMEOUT\u003c/code\u003e. The latter will not run the provided callback in case\nof an timeout.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe third argument of \u003ccode\u003ewithTimeout\u003c/code\u003e is optional and can be used to\ncustomize the error with which the promise is rejected.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const mutexWithTimeout = withTimeout(new Mutex(), 100, new Error('new fancy error'));\nconst semaphoreWithTimeout = withTimeout(new Semaphore(5), 100, new Error('new fancy error'));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emutexWithTimeout\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003ewithTimeout\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eMutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e100\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eError\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'new fancy error'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esemaphoreWithTimeout\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003ewithTimeout\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSemaphore\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e5\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e100\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eError\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'new fancy error'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFailing early if the mutex or semaphore is not available\u003c/h3\u003e\u003ca id=\"user-content-failing-early-if-the-mutex-or-semaphore-is-not-available\" class=\"anchor\" aria-label=\"Permalink: Failing early if the mutex or semaphore is not available\" href=\"#failing-early-if-the-mutex-or-semaphore-is-not-available\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA shortcut exists for the case where you do not want to wait for a lock to\nbe available at all. The \u003ccode\u003etryAcquire\u003c/code\u003e decorator can be applied to both mutexes\nand semaphores and changes the behavior of \u003ccode\u003eacquire\u003c/code\u003e and \u003ccode\u003erunExclusive\u003c/code\u003e to\nimmediately throw \u003ccode\u003eE_ALREADY_LOCKED\u003c/code\u003e if the mutex is not available.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePromise style:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {tryAcquire, E_ALREADY_LOCKED} from 'async-mutex';\n\ntryAcquire(semaphoreOrMutex)\n    .runExclusive(() =\u0026gt; {\n        // ...\n    })\n    .then(() =\u0026gt; {\n        // ...\n    })\n    .catch(e =\u0026gt; {\n        if (e === E_ALREADY_LOCKED) {\n            // ...\n        }\n    });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003etryAcquire\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eE_ALREADY_LOCKED\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'async-mutex'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-en\"\u003etryAcquire\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esemaphoreOrMutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erunExclusive\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ethen\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecatch\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e===\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eE_ALREADY_LOCKED\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n            \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n        \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003easync/await:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {tryAcquire, E_ALREADY_LOCKED} from 'async-mutex';\n\ntry {\n    await tryAcquire(semaphoreOrMutex).runExclusive(() =\u0026gt; {\n        // ...\n    });\n} catch (e) {\n    if (e === E_ALREADY_LOCKED) {\n        // ...\n    }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003etryAcquire\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eE_ALREADY_LOCKED\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'async-mutex'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n    \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-en\"\u003etryAcquire\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esemaphoreOrMutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erunExclusive\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n    \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e===\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eE_ALREADY_LOCKED\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAgain, the error can be customized by providing a custom error as second argument to\n\u003ccode\u003etryAcquire\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"tryAcquire(semaphoreOrMutex, new Error('new fancy error'))\n    .runExclusive(() =\u0026gt; {\n        // ...\n    });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-en\"\u003etryAcquire\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esemaphoreOrMutex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eError\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'new fancy error'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erunExclusive\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n        \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n    \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLicense\u003c/h1\u003e\u003ca id=\"user-content-license\" class=\"anchor\" aria-label=\"Permalink: License\" href=\"#license\"\u003e\u003csvg data-component=\"Octicon\" class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFeel free to use this library under the conditions of the MIT license.\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"What is it?","anchor":"what-is-it","htmlText":"What is it?"},{"level":2,"text":"Mutex","anchor":"mutex","htmlText":"Mutex"},{"level":1,"text":"Semaphore","anchor":"semaphore","htmlText":"Semaphore"},{"level":1,"text":"How to use it?","anchor":"how-to-use-it","htmlText":"How to use it?"},{"level":2,"text":"Installation","anchor":"installation","htmlText":"Installation"},{"level":2,"text":"Importing","anchor":"importing","htmlText":"Importing"},{"level":2,"text":"Mutex API","anchor":"mutex-api","htmlText":"Mutex API"},{"level":3,"text":"Creating","anchor":"creating","htmlText":"Creating"},{"level":3,"text":"Synchronized code execution","anchor":"synchronized-code-execution","htmlText":"Synchronized code execution"},{"level":3,"text":"Manual locking / releasing","anchor":"manual-locking--releasing","htmlText":"Manual locking / releasing"},{"level":3,"text":"Unscoped release","anchor":"unscoped-release","htmlText":"Unscoped release"},{"level":3,"text":"Checking whether the mutex is locked","anchor":"checking-whether-the-mutex-is-locked","htmlText":"Checking whether the mutex is locked"},{"level":3,"text":"Cancelling pending locks","anchor":"cancelling-pending-locks","htmlText":"Cancelling pending locks"},{"level":3,"text":"Waiting until the mutex is 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<div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">What is it?</h1><a id="user-content-what-is-it" class="anchor" aria-label="Permalink: What is it?" href="#what-is-it"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">This package implements primitives for synchronizing asynchronous operations in
Javascript.</p>
<div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Mutex</h2><a id="user-content-mutex" class="anchor" aria-label="Permalink: Mutex" href="#mutex"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">The term "mutex" usually refers to a data structure used to synchronize
concurrent processes running on different threads. For example, before accessing
a non-threadsafe resource, a thread will lock the mutex. This is guaranteed
to block the thread until no other thread holds a lock on the mutex and thus
enforces exclusive access to the resource. Once the operation is complete, the
thread releases the lock, allowing other threads to acquire a lock and access the
resource.</p>
<p dir="auto">While Javascript is strictly single-threaded, the asynchronous nature of its
execution model allows for race conditions that require similar synchronization
primitives. Consider for example a library communicating with a web worker that
needs to exchange several subsequent messages with the worker in order to achieve
a task. As these messages are exchanged in an asynchronous manner, it is perfectly
possible that the library is called again during this process. Depending on the
way state is handled during the async process, this will lead to race conditions
that are hard to fix and even harder to track down.</p>
<p dir="auto">This library solves the problem by applying the concept of mutexes to Javascript.
Locking the mutex will return a promise that resolves once the mutex becomes
available. Once the async process is complete (usually taking multiple
spins of the event loop), a callback supplied to the caller should be called in order
to release the mutex, allowing the next scheduled worker to execute.</p>
<div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Semaphore</h1><a id="user-content-semaphore" class="anchor" aria-label="Permalink: Semaphore" href="#semaphore"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">Imagine a situation where you need to control access to several instances of
a shared resource. For example, you might want to distribute images between several
worker processes that perform transformations, or you might want to create a web
crawler that performs a defined number of requests in parallel.</p>
<p dir="auto">A semaphore is a data structure that is initialized with an arbitrary integer value and that
can be locked multiple times.
As long as the semaphore value is positive, locking it will return the current value
and the locking process will continue execution immediately; the semaphore will
be decremented upon locking. Releasing the lock will increment the semaphore again.</p>
<p dir="auto">Once the semaphore has reached zero, the next process that attempts to acquire a lock
will be suspended until another process releases its lock and this increments the semaphore
again.</p>
<p dir="auto">This library provides a semaphore implementation for Javascript that is similar to the
mutex implementation described above.</p>
<div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">How to use it?</h1><a id="user-content-how-to-use-it" class="anchor" aria-label="Permalink: How to use it?" href="#how-to-use-it"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Installation</h2><a id="user-content-installation" class="anchor" aria-label="Permalink: Installation" href="#installation"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">You can install the library into your project via npm</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="npm install async-mutex"><pre class="notranslate"><code>npm install async-mutex
</code></pre></div>
<p dir="auto">The library is written in TypeScript and will work in any environment that
supports ES5, ES6 promises and <code>Array.isArray</code>. On ancient browsers,
a shim can be used (e.g. <a href="https://github.com/zloirock/core-js">core-js</a>).
No external typings are required for using this library with
TypeScript (version &gt;= 2).</p>
<p dir="auto">Starting with Node 12.16 and 13.7, native ES6 style imports are supported.</p>
<p dir="auto"><strong>WARNING:</strong> Node 13 versions &lt; 13.2.0 fail to import this package correctly.
Node 12 and earlier are fine, as are newer versions of Node 13.</p>
<div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Importing</h2><a id="user-content-importing" class="anchor" aria-label="Permalink: Importing" href="#importing"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto"><strong>CommonJS:</strong></p>
<div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const {Mutex, Semaphore, withTimeout} = require('async-mutex');"><pre><span class="pl-k">const</span> <span class="pl-kos">{</span>Mutex<span class="pl-kos">,</span> Semaphore<span class="pl-kos">,</span> withTimeout<span class="pl-kos">}</span> <span class="pl-c1">=</span> <span class="pl-en">require</span><span class="pl-kos">(</span><span class="pl-s">'async-mutex'</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto"><strong>ES6:</strong></p>
<div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {Mutex, Semaphore, withTimeout} from 'async-mutex';"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-v">Mutex</span><span class="pl-kos">,</span> <span class="pl-v">Semaphore</span><span class="pl-kos">,</span> <span class="pl-s1">withTimeout</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'async-mutex'</span><span class="pl-kos">;</span></pre></div>
<p dir="auto"><strong>TypeScript:</strong></p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {Mutex, MutexInterface, Semaphore, SemaphoreInterface, withTimeout} from 'async-mutex';"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-v">Mutex</span><span class="pl-kos">,</span> <span class="pl-v">MutexInterface</span><span class="pl-kos">,</span> <span class="pl-v">Semaphore</span><span class="pl-kos">,</span> <span class="pl-v">SemaphoreInterface</span><span class="pl-kos">,</span> <span class="pl-s1">withTimeout</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'async-mutex'</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">With the latest version of Node, native ES6 style imports are supported.</p>
<div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Mutex API</h2><a id="user-content-mutex-api" class="anchor" aria-label="Permalink: Mutex API" href="#mutex-api"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Creating</h3><a id="user-content-creating" class="anchor" aria-label="Permalink: Creating" href="#creating"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const mutex = new Mutex();"><pre><span class="pl-k">const</span> <span class="pl-s1">mutex</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">Mutex</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">Create a new mutex.</p>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Synchronized code execution</h3><a id="user-content-synchronized-code-execution" class="anchor" aria-label="Permalink: Synchronized code execution" href="#synchronized-code-execution"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">Promise style:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="mutex
    .runExclusive(() =&gt; {
        // ...
    })
    .then((result) =&gt; {
        // ...
    });"><pre><span class="pl-s1">mutex</span>
    <span class="pl-kos">.</span><span class="pl-en">runExclusive</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">then</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-s1">result</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">async/await:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="await mutex.runExclusive(async () =&gt; {
    // ...
});"><pre><span class="pl-k">await</span> <span class="pl-s1">mutex</span><span class="pl-kos">.</span><span class="pl-en">runExclusive</span><span class="pl-kos">(</span><span class="pl-k">async</span> <span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
    <span class="pl-c">// ...</span>
<span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto"><code>runExclusive</code> schedules the supplied callback to be run once the mutex is unlocked.
The function may return a promise. Once the promise is resolved or rejected (or immediately after
execution if an immediate value was returned),
the mutex is released. <code>runExclusive</code> returns a promise that adopts the state of the function result.</p>
<p dir="auto">The mutex is released and the result rejected if an exception occurs during execution
of the callback.</p>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Manual locking / releasing</h3><a id="user-content-manual-locking--releasing" class="anchor" aria-label="Permalink: Manual locking / releasing" href="#manual-locking--releasing"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">Promise style:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="mutex
    .acquire()
    .then(function(release) {
        // ...

        release();
    });"><pre><span class="pl-s1">mutex</span>
    <span class="pl-kos">.</span><span class="pl-en">acquire</span><span class="pl-kos">(</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">then</span><span class="pl-kos">(</span><span class="pl-k">function</span><span class="pl-kos">(</span><span class="pl-s1">release</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>

        <span class="pl-en">release</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">async/await:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const release = await mutex.acquire();
try {
    // ...
} finally {
    release();
}"><pre><span class="pl-k">const</span> <span class="pl-s1">release</span> <span class="pl-c1">=</span> <span class="pl-k">await</span> <span class="pl-s1">mutex</span><span class="pl-kos">.</span><span class="pl-en">acquire</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-k">try</span> <span class="pl-kos">{</span>
    <span class="pl-c">// ...</span>
<span class="pl-kos">}</span> <span class="pl-k">finally</span> <span class="pl-kos">{</span>
    <span class="pl-en">release</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-kos">}</span></pre></div>
<p dir="auto"><code>acquire</code> returns an (ES6) promise that will resolve as soon as the mutex is
available. The promise resolves with a function <code>release</code> that
must be called once the mutex should be released again. The <code>release</code> callback
is idempotent.</p>
<p dir="auto"><strong>IMPORTANT:</strong> Failure to call <code>release</code> will hold the mutex locked and will
likely deadlock the application. Make sure to call <code>release</code> under all circumstances
and handle exceptions accordingly.</p>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Unscoped release</h3><a id="user-content-unscoped-release" class="anchor" aria-label="Permalink: Unscoped release" href="#unscoped-release"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">As an alternative to calling the <code>release</code> callback returned by <code>acquire</code>, the mutex
can be released by calling <code>release</code> directly on it:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="mutex.release();"><pre><span class="pl-s1">mutex</span><span class="pl-kos">.</span><span class="pl-en">release</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Checking whether the mutex is locked</h3><a id="user-content-checking-whether-the-mutex-is-locked" class="anchor" aria-label="Permalink: Checking whether the mutex is locked" href="#checking-whether-the-mutex-is-locked"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="mutex.isLocked();"><pre><span class="pl-s1">mutex</span><span class="pl-kos">.</span><span class="pl-en">isLocked</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Cancelling pending locks</h3><a id="user-content-cancelling-pending-locks" class="anchor" aria-label="Permalink: Cancelling pending locks" href="#cancelling-pending-locks"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">Pending locks can be cancelled by calling <code>cancel()</code> on the mutex. This will reject
all pending locks with <code>E_CANCELED</code>:</p>
<p dir="auto">Promise style:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {E_CANCELED} from 'async-mutex';

mutex
    .runExclusive(() =&gt; {
        // ...
    })
    .then(() =&gt; {
        // ...
    })
    .catch(e =&gt; {
        if (e === E_CANCELED) {
            // ...
        }
    });"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-c1">E_CANCELED</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'async-mutex'</span><span class="pl-kos">;</span>

<span class="pl-s1">mutex</span>
    <span class="pl-kos">.</span><span class="pl-en">runExclusive</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">then</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">catch</span><span class="pl-kos">(</span><span class="pl-s1">e</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">e</span> <span class="pl-c1">===</span> <span class="pl-c1">E_CANCELED</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
            <span class="pl-c">// ...</span>
        <span class="pl-kos">}</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">async/await:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {E_CANCELED} from 'async-mutex';

try {
    await mutex.runExclusive(() =&gt; {
        // ...
    });
} catch (e) {
    if (e === E_CANCELED) {
        // ...
    }
}"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-c1">E_CANCELED</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'async-mutex'</span><span class="pl-kos">;</span>

<span class="pl-k">try</span> <span class="pl-kos">{</span>
    <span class="pl-k">await</span> <span class="pl-s1">mutex</span><span class="pl-kos">.</span><span class="pl-en">runExclusive</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">(</span><span class="pl-s1">e</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
    <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">e</span> <span class="pl-c1">===</span> <span class="pl-c1">E_CANCELED</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span>
<span class="pl-kos">}</span></pre></div>
<p dir="auto">This works with <code>acquire</code>, too:
if <code>acquire</code> is used for locking, the resulting promise will reject with <code>E_CANCELED</code>.</p>
<p dir="auto">The error that is thrown can be customized by passing a different error to the <code>Mutex</code>
constructor:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const mutex = new Mutex(new Error('fancy custom error'));"><pre><span class="pl-k">const</span> <span class="pl-s1">mutex</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">Mutex</span><span class="pl-kos">(</span><span class="pl-k">new</span> <span class="pl-v">Error</span><span class="pl-kos">(</span><span class="pl-s">'fancy custom error'</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">Note that while all pending locks are cancelled, a currently held lock will not be
revoked. In consequence, the mutex may not be available even after <code>cancel()</code> has been called.</p>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Waiting until the mutex is available</h3><a id="user-content-waiting-until-the-mutex-is-available" class="anchor" aria-label="Permalink: Waiting until the mutex is available" href="#waiting-until-the-mutex-is-available"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">You can wait until the mutex is available without locking it by calling <code>waitForUnlock()</code>.
This will return a promise that resolve once the mutex can be acquired again. This operation
will not lock the mutex, and there is no guarantee that the mutex will still be available
once an async barrier has been encountered.</p>
<p dir="auto">Promise style:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="mutex
    .waitForUnlock()
    .then(() =&gt; {
        // ...
    });"><pre><span class="pl-s1">mutex</span>
    <span class="pl-kos">.</span><span class="pl-en">waitForUnlock</span><span class="pl-kos">(</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">then</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">Async/await:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="await mutex.waitForUnlock();
// ..."><pre><span class="pl-k">await</span> <span class="pl-s1">mutex</span><span class="pl-kos">.</span><span class="pl-en">waitForUnlock</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-c">// ...</span></pre></div>
<div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Semaphore API</h2><a id="user-content-semaphore-api" class="anchor" aria-label="Permalink: Semaphore API" href="#semaphore-api"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Creating</h3><a id="user-content-creating-1" class="anchor" aria-label="Permalink: Creating" href="#creating-1"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const semaphore = new Semaphore(initialValue);"><pre><span class="pl-k">const</span> <span class="pl-s1">semaphore</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">Semaphore</span><span class="pl-kos">(</span><span class="pl-s1">initialValue</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">Creates a new semaphore. <code>initialValue</code> is an arbitrary integer that defines the
initial value of the semaphore.</p>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Synchronized code execution</h3><a id="user-content-synchronized-code-execution-1" class="anchor" aria-label="Permalink: Synchronized code execution" href="#synchronized-code-execution-1"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">Promise style:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="semaphore
    .runExclusive(function(value) {
        // ...
    })
    .then(function(result) {
        // ...
    });"><pre><span class="pl-s1">semaphore</span>
    <span class="pl-kos">.</span><span class="pl-en">runExclusive</span><span class="pl-kos">(</span><span class="pl-k">function</span><span class="pl-kos">(</span><span class="pl-s1">value</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">then</span><span class="pl-kos">(</span><span class="pl-k">function</span><span class="pl-kos">(</span><span class="pl-s1">result</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">async/await:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="await semaphore.runExclusive(async (value) =&gt; {
    // ...
});"><pre><span class="pl-k">await</span> <span class="pl-s1">semaphore</span><span class="pl-kos">.</span><span class="pl-en">runExclusive</span><span class="pl-kos">(</span><span class="pl-k">async</span> <span class="pl-kos">(</span><span class="pl-s1">value</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
    <span class="pl-c">// ...</span>
<span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto"><code>runExclusive</code> schedules the supplied callback to be run once the semaphore is available.
The callback will receive the current value of the semaphore as its argument.
The function may return a promise. Once the promise is resolved or rejected (or immediately after
execution if an immediate value was returned),
the semaphore is released. <code>runExclusive</code> returns a promise that adopts the state of the function result.</p>
<p dir="auto">The semaphore is released and the result rejected if an exception occurs during execution
of the callback.</p>
<p dir="auto"><code>runExclusive</code> accepts a first optional argument <code>weight</code>. Specifying a <code>weight</code> will decrement the
semaphore by the specified value, and the callback will only be invoked once the semaphore's
value greater or equal to <code>weight</code>.</p>
<p dir="auto"><code>runExclusive</code> accepts a second optional argument <code>priority</code>. Specifying a greater value for <code>priority</code>
tells the scheduler to run this task before other tasks. <code>priority</code> can be any real number. The default
is zero.</p>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Manual locking / releasing</h3><a id="user-content-manual-locking--releasing-1" class="anchor" aria-label="Permalink: Manual locking / releasing" href="#manual-locking--releasing-1"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">Promise style:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="semaphore
    .acquire()
    .then(function([value, release]) {
        // ...

        release();
    });"><pre><span class="pl-s1">semaphore</span>
    <span class="pl-kos">.</span><span class="pl-en">acquire</span><span class="pl-kos">(</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">then</span><span class="pl-kos">(</span><span class="pl-k">function</span><span class="pl-kos">(</span><span class="pl-kos">[</span><span class="pl-s1">value</span><span class="pl-kos">,</span> <span class="pl-s1">release</span><span class="pl-kos">]</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>

        <span class="pl-en">release</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">async/await:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const [value, release] = await semaphore.acquire();
try {
    // ...
} finally {
    release();
}"><pre><span class="pl-k">const</span> <span class="pl-kos">[</span><span class="pl-s1">value</span><span class="pl-kos">,</span> <span class="pl-s1">release</span><span class="pl-kos">]</span> <span class="pl-c1">=</span> <span class="pl-k">await</span> <span class="pl-s1">semaphore</span><span class="pl-kos">.</span><span class="pl-en">acquire</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-k">try</span> <span class="pl-kos">{</span>
    <span class="pl-c">// ...</span>
<span class="pl-kos">}</span> <span class="pl-k">finally</span> <span class="pl-kos">{</span>
    <span class="pl-en">release</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-kos">}</span></pre></div>
<p dir="auto"><code>acquire</code> returns an (ES6) promise that will resolve as soon as the semaphore is
available. The promise resolves to an array with the
first entry being the current value of the semaphore, and the second value a
function that must be called to release the semaphore once the critical operation
has completed. The <code>release</code> callback is idempotent.</p>
<p dir="auto"><strong>IMPORTANT:</strong> Failure to call <code>release</code> will hold the semaphore locked and will
likely deadlock the application. Make sure to call <code>release</code> under all circumstances
and handle exceptions accordingly.</p>
<p dir="auto"><code>acquire</code> accepts a first optional argument <code>weight</code>. Specifying a <code>weight</code> will decrement the
semaphore by the specified value, and the semaphore will only be acquired once its
value is greater or equal to <code>weight</code>.</p>
<p dir="auto"><code>acquire</code> accepts a second optional argument <code>priority</code>. Specifying a greater value for <code>priority</code>
tells the scheduler to release the semaphore to the caller before other callers. <code>priority</code> can be
any real number. The default is zero.</p>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Unscoped release</h3><a id="user-content-unscoped-release-1" class="anchor" aria-label="Permalink: Unscoped release" href="#unscoped-release-1"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">As an alternative to calling the <code>release</code> callback returned by <code>acquire</code>, the semaphore
can be released by calling <code>release</code> directly on it:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="semaphore.release();"><pre><span class="pl-s1">semaphore</span><span class="pl-kos">.</span><span class="pl-en">release</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto"><code>release</code> accepts an optional argument <code>weight</code> and increments the semaphore accordingly.</p>
<p dir="auto"><strong>IMPORTANT:</strong> Releasing a previously acquired semaphore with the releaser that was
returned by acquire will automatically increment the semaphore by the correct weight. If
you release by calling the unscoped <code>release</code> you have to supply the correct weight
yourself!</p>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Getting the semaphore value</h3><a id="user-content-getting-the-semaphore-value" class="anchor" aria-label="Permalink: Getting the semaphore value" href="#getting-the-semaphore-value"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="semaphore.getValue()"><pre><span class="pl-s1">semaphore</span><span class="pl-kos">.</span><span class="pl-en">getValue</span><span class="pl-kos">(</span><span class="pl-kos">)</span></pre></div>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Checking whether the semaphore is locked</h3><a id="user-content-checking-whether-the-semaphore-is-locked" class="anchor" aria-label="Permalink: Checking whether the semaphore is locked" href="#checking-whether-the-semaphore-is-locked"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="semaphore.isLocked();"><pre><span class="pl-s1">semaphore</span><span class="pl-kos">.</span><span class="pl-en">isLocked</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">The semaphore is considered to be locked if its value is either zero or negative.</p>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Setting the semaphore value</h3><a id="user-content-setting-the-semaphore-value" class="anchor" aria-label="Permalink: Setting the semaphore value" href="#setting-the-semaphore-value"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">The value of a semaphore can be set directly to a desired value. A positive value will
cause the semaphore to schedule any pending waiters accordingly.</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="semaphore.setValue();"><pre><span class="pl-s1">semaphore</span><span class="pl-kos">.</span><span class="pl-en">setValue</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Cancelling pending locks</h3><a id="user-content-cancelling-pending-locks-1" class="anchor" aria-label="Permalink: Cancelling pending locks" href="#cancelling-pending-locks-1"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">Pending locks can be cancelled by calling <code>cancel()</code> on the semaphore. This will reject
all pending locks with <code>E_CANCELED</code>:</p>
<p dir="auto">Promise style:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {E_CANCELED} from 'async-mutex';

semaphore
    .runExclusive(() =&gt; {
        // ...
    })
    .then(() =&gt; {
        // ...
    })
    .catch(e =&gt; {
        if (e === E_CANCELED) {
            // ...
        }
    });"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-c1">E_CANCELED</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'async-mutex'</span><span class="pl-kos">;</span>

<span class="pl-s1">semaphore</span>
    <span class="pl-kos">.</span><span class="pl-en">runExclusive</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">then</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">catch</span><span class="pl-kos">(</span><span class="pl-s1">e</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">e</span> <span class="pl-c1">===</span> <span class="pl-c1">E_CANCELED</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
            <span class="pl-c">// ...</span>
        <span class="pl-kos">}</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">async/await:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {E_CANCELED} from 'async-mutex';

try {
    await semaphore.runExclusive(() =&gt; {
        // ...
    });
} catch (e) {
    if (e === E_CANCELED) {
        // ...
    }
}"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-c1">E_CANCELED</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'async-mutex'</span><span class="pl-kos">;</span>

<span class="pl-k">try</span> <span class="pl-kos">{</span>
    <span class="pl-k">await</span> <span class="pl-s1">semaphore</span><span class="pl-kos">.</span><span class="pl-en">runExclusive</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">(</span><span class="pl-s1">e</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
    <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">e</span> <span class="pl-c1">===</span> <span class="pl-c1">E_CANCELED</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span>
<span class="pl-kos">}</span></pre></div>
<p dir="auto">This works with <code>acquire</code>, too:
if <code>acquire</code> is used for locking, the resulting promise will reject with <code>E_CANCELED</code>.</p>
<p dir="auto">The error that is thrown can be customized by passing a different error to the <code>Semaphore</code>
constructor:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const semaphore = new Semaphore(2, new Error('fancy custom error'));"><pre><span class="pl-k">const</span> <span class="pl-s1">semaphore</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">Semaphore</span><span class="pl-kos">(</span><span class="pl-c1">2</span><span class="pl-kos">,</span> <span class="pl-k">new</span> <span class="pl-v">Error</span><span class="pl-kos">(</span><span class="pl-s">'fancy custom error'</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">Note that while all pending locks are cancelled, any currently held locks will not be
revoked. In consequence, the semaphore may not be available even after <code>cancel()</code> has been called.</p>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Waiting until the semaphore is available</h3><a id="user-content-waiting-until-the-semaphore-is-available" class="anchor" aria-label="Permalink: Waiting until the semaphore is available" href="#waiting-until-the-semaphore-is-available"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">You can wait until the semaphore is available without locking it by calling <code>waitForUnlock()</code>.
This will return a promise that resolve once the semaphore can be acquired again. This operation
will not lock the semaphore, and there is no guarantee that the semaphore will still be available
once an async barrier has been encountered.</p>
<p dir="auto">Promise style:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="semaphore
    .waitForUnlock()
    .then(() =&gt; {
        // ...
    });"><pre><span class="pl-s1">semaphore</span>
    <span class="pl-kos">.</span><span class="pl-en">waitForUnlock</span><span class="pl-kos">(</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">then</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">Async/await:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="await semaphore.waitForUnlock();
// ..."><pre><span class="pl-k">await</span> <span class="pl-s1">semaphore</span><span class="pl-kos">.</span><span class="pl-en">waitForUnlock</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-c">// ...</span></pre></div>
<p dir="auto"><code>waitForUnlock</code> accepts optional arguments <code>weight</code> and <code>priority</code>. The promise will resolve as soon
as it is possible to <code>acquire</code> the semaphore with the given weight and priority. Scheduled tasks with
the greatest <code>priority</code> values execute first.</p>
<div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Limiting the time waiting for a mutex or semaphore to become available</h2><a id="user-content-limiting-the-time-waiting-for-a-mutex-or-semaphore-to-become-available" class="anchor" aria-label="Permalink: Limiting the time waiting for a mutex or semaphore to become available" href="#limiting-the-time-waiting-for-a-mutex-or-semaphore-to-become-available"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">Sometimes it is desirable to limit the time a program waits for a mutex or
semaphore to become available. The <code>withTimeout</code> decorator can be applied
to both semaphores and mutexes and changes the behavior of <code>acquire</code> and
<code>runExclusive</code> accordingly.</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {withTimeout, E_TIMEOUT} from 'async-mutex';

const mutexWithTimeout = withTimeout(new Mutex(), 100);
const semaphoreWithTimeout = withTimeout(new Semaphore(5), 100);"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">withTimeout</span><span class="pl-kos">,</span> <span class="pl-c1">E_TIMEOUT</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'async-mutex'</span><span class="pl-kos">;</span>

<span class="pl-k">const</span> <span class="pl-s1">mutexWithTimeout</span> <span class="pl-c1">=</span> <span class="pl-en">withTimeout</span><span class="pl-kos">(</span><span class="pl-k">new</span> <span class="pl-v">Mutex</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-c1">100</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-k">const</span> <span class="pl-s1">semaphoreWithTimeout</span> <span class="pl-c1">=</span> <span class="pl-en">withTimeout</span><span class="pl-kos">(</span><span class="pl-k">new</span> <span class="pl-v">Semaphore</span><span class="pl-kos">(</span><span class="pl-c1">5</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-c1">100</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">The API of the decorated mutex or semaphore is unchanged.</p>
<p dir="auto">The second argument of <code>withTimeout</code> is the timeout in milliseconds. After the
timeout is exceeded, the promise returned by <code>acquire</code> and <code>runExclusive</code> will
reject with <code>E_TIMEOUT</code>. The latter will not run the provided callback in case
of an timeout.</p>
<p dir="auto">The third argument of <code>withTimeout</code> is optional and can be used to
customize the error with which the promise is rejected.</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const mutexWithTimeout = withTimeout(new Mutex(), 100, new Error('new fancy error'));
const semaphoreWithTimeout = withTimeout(new Semaphore(5), 100, new Error('new fancy error'));"><pre><span class="pl-k">const</span> <span class="pl-s1">mutexWithTimeout</span> <span class="pl-c1">=</span> <span class="pl-en">withTimeout</span><span class="pl-kos">(</span><span class="pl-k">new</span> <span class="pl-v">Mutex</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-c1">100</span><span class="pl-kos">,</span> <span class="pl-k">new</span> <span class="pl-v">Error</span><span class="pl-kos">(</span><span class="pl-s">'new fancy error'</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-k">const</span> <span class="pl-s1">semaphoreWithTimeout</span> <span class="pl-c1">=</span> <span class="pl-en">withTimeout</span><span class="pl-kos">(</span><span class="pl-k">new</span> <span class="pl-v">Semaphore</span><span class="pl-kos">(</span><span class="pl-c1">5</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-c1">100</span><span class="pl-kos">,</span> <span class="pl-k">new</span> <span class="pl-v">Error</span><span class="pl-kos">(</span><span class="pl-s">'new fancy error'</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Failing early if the mutex or semaphore is not available</h3><a id="user-content-failing-early-if-the-mutex-or-semaphore-is-not-available" class="anchor" aria-label="Permalink: Failing early if the mutex or semaphore is not available" href="#failing-early-if-the-mutex-or-semaphore-is-not-available"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">A shortcut exists for the case where you do not want to wait for a lock to
be available at all. The <code>tryAcquire</code> decorator can be applied to both mutexes
and semaphores and changes the behavior of <code>acquire</code> and <code>runExclusive</code> to
immediately throw <code>E_ALREADY_LOCKED</code> if the mutex is not available.</p>
<p dir="auto">Promise style:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {tryAcquire, E_ALREADY_LOCKED} from 'async-mutex';

tryAcquire(semaphoreOrMutex)
    .runExclusive(() =&gt; {
        // ...
    })
    .then(() =&gt; {
        // ...
    })
    .catch(e =&gt; {
        if (e === E_ALREADY_LOCKED) {
            // ...
        }
    });"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">tryAcquire</span><span class="pl-kos">,</span> <span class="pl-c1">E_ALREADY_LOCKED</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'async-mutex'</span><span class="pl-kos">;</span>

<span class="pl-en">tryAcquire</span><span class="pl-kos">(</span><span class="pl-s1">semaphoreOrMutex</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">runExclusive</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">then</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">catch</span><span class="pl-kos">(</span><span class="pl-s1">e</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">e</span> <span class="pl-c1">===</span> <span class="pl-c1">E_ALREADY_LOCKED</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
            <span class="pl-c">// ...</span>
        <span class="pl-kos">}</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">async/await:</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {tryAcquire, E_ALREADY_LOCKED} from 'async-mutex';

try {
    await tryAcquire(semaphoreOrMutex).runExclusive(() =&gt; {
        // ...
    });
} catch (e) {
    if (e === E_ALREADY_LOCKED) {
        // ...
    }
}"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">tryAcquire</span><span class="pl-kos">,</span> <span class="pl-c1">E_ALREADY_LOCKED</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'async-mutex'</span><span class="pl-kos">;</span>

<span class="pl-k">try</span> <span class="pl-kos">{</span>
    <span class="pl-k">await</span> <span class="pl-en">tryAcquire</span><span class="pl-kos">(</span><span class="pl-s1">semaphoreOrMutex</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">runExclusive</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">(</span><span class="pl-s1">e</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
    <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">e</span> <span class="pl-c1">===</span> <span class="pl-c1">E_ALREADY_LOCKED</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span>
<span class="pl-kos">}</span></pre></div>
<p dir="auto">Again, the error can be customized by providing a custom error as second argument to
<code>tryAcquire</code>.</p>
<div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="tryAcquire(semaphoreOrMutex, new Error('new fancy error'))
    .runExclusive(() =&gt; {
        // ...
    });"><pre><span class="pl-en">tryAcquire</span><span class="pl-kos">(</span><span class="pl-s1">semaphoreOrMutex</span><span class="pl-kos">,</span> <span class="pl-k">new</span> <span class="pl-v">Error</span><span class="pl-kos">(</span><span class="pl-s">'new fancy error'</span><span class="pl-kos">)</span><span class="pl-kos">)</span>
    <span class="pl-kos">.</span><span class="pl-en">runExclusive</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=&gt;</span> <span class="pl-kos">{</span>
        <span class="pl-c">// ...</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">License</h1><a id="user-content-license" class="anchor" aria-label="Permalink: License" href="#license"><svg data-component="Octicon" class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div>
<p dir="auto">Feel free to use this library under the conditions of the MIT license.</p>
</article></div></div></div></div></div></div></div><div class="prc-PageLayout-PaneWrapper-pHPop pr-2" style="--offset-header:0px;--spacing-row:var(--spacing-none);--spacing-column:var(--spacing-none)" data-is-hidden="false" data-position="end"><div class="prc-PageLayout-HorizontalDivider-JLVqp prc-PageLayout-PaneHorizontalDivider-9tbnE" data-variant-narrow="none" data-variant-regular="none" data-position="end" style="--spacing-divider:var(--spacing-none);--spacing:var(--spacing-none)"></div><div class="prc-PageLayout-Pane-AyzHK" style="--spacing:var(--spacing-normal);--pane-min-width:256px;--pane-max-width:calc(100vw - var(--pane-max-width-diff));--pane-width-size:var(--pane-width-large);--pane-width:320px"><rails-partial data-partial-name="codeViewRepoRoute.Sidebar" class="RailsPartial-module__d-contents__G5m4w">

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  <h2 class="tmp-mb-3 h4">About</h2>

      <p class="f4 tmp-my-3">
        A mutex for synchronizing async workflows in Javascript
      </p>


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    <button type="button" class="flash-close js-ajax-error-dismiss" aria-label="Dismiss error">
      <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x">
    <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path>
</svg>
    </button>
    You can’t perform that action at this time.
  </div>

    <template id="site-details-dialog">
  <details class="details-reset details-overlay details-overlay-dark lh-default color-fg-default hx_rsm" open>
    <summary role="button" aria-label="Close dialog"></summary>
    <details-dialog class="Box Box--overlay d-flex flex-column anim-fade-in fast hx_rsm-dialog hx_rsm-modal">
      <button class="Box-btn-octicon m-0 btn-octicon position-absolute right-0 top-0" type="button" aria-label="Close dialog" data-close-dialog>
        <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x">
    <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path>
</svg>
      </button>
      <div class="octocat-spinner tmp-my-6 js-details-dialog-spinner"></div>
    </details-dialog>
  </details>
</template>

    <div class="Popover js-hovercard-content position-absolute" style="display: none; outline: none;">
  <div class="Popover-message Popover-message--bottom-left Popover-message--large Box color-shadow-large" style="width:360px;">
  </div>
</div>

    <template id="snippet-clipboard-copy-button">
  <div class="zeroclipboard-container position-absolute right-0 top-0">
    <clipboard-copy aria-label="Copy code to clipboard" class="ClipboardButton btn js-clipboard-copy m-2 p-0" data-copy-feedback="Copied!" data-tooltip-direction="w">
      <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon m-2 tmp-m-2">
    <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path>
</svg>
      <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none m-2 tmp-m-2">
    <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path>
</svg>
    </clipboard-copy>
  </div>
</template>
<template id="snippet-clipboard-copy-button-unpositioned">
  <div class="zeroclipboard-container">
    <clipboard-copy aria-label="Copy code to clipboard" class="ClipboardButton btn btn-invisible js-clipboard-copy m-2 p-0 d-flex flex-justify-center flex-items-center" data-copy-feedback="Copied!" data-tooltip-direction="w">
      <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon">
    <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path>
</svg>
      <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none">
    <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path>
</svg>
    </clipboard-copy>
  </div>
</template>




    </div>
    <div id="js-global-screen-reader-notice" class="sr-only mt-n1" aria-live="polite" aria-atomic="true" ></div>
    <div id="js-global-screen-reader-notice-assertive" class="sr-only mt-n1" aria-live="assertive" aria-atomic="true"></div>
  </body>
</html>

