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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-40908] Alter stdx::condition_variable::_runWithNotifyable to avoid allocations</title>
                <link>https://jira.mongodb.org/browse/SERVER-40908</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;condition_variable::_runWithNotifyable allocates a linked list member for the notification list per invocation.  It also does this under both the condvar mutex as well as the mutex for the predicate waiter.&lt;/p&gt;

&lt;p&gt;Two things need to happen for this:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;notifyables need to either own a std::list&amp;lt;Notifyable*&amp;gt; or be intrusively linked listed&lt;/li&gt;
	&lt;li&gt;NotInterruptible needs to not be a global (making it a thread local would do)&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="750877">SERVER-40908</key>
            <summary>Alter stdx::condition_variable::_runWithNotifyable to avoid allocations</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Tue, 30 Apr 2019 15:50:23 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:15 +0000</updated>
                            <resolved>Wed, 5 Jun 2019 17:24:39 +0000</resolved>
                                                    <fixVersion>4.2.0-rc1</fixVersion>
                    <fixVersion>4.3.1</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2273309" author="xgen-internal-githook" created="Wed, 5 Jun 2019 22:53:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Carey&apos;, &apos;email&apos;: &apos;jcarey@argv.me&apos;, &apos;username&apos;: &apos;hanumantmk&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40908&quot; title=&quot;Alter stdx::condition_variable::_runWithNotifyable to avoid allocations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40908&quot;&gt;&lt;del&gt;SERVER-40908&lt;/del&gt;&lt;/a&gt; !allocs in cv::_runWithNotifyable&lt;/p&gt;

&lt;p&gt;condition_variable::_runWithNotifyable allocates a linked list member&lt;br/&gt;
for the notification list per invocation. It also does this under both&lt;br/&gt;
the condvar mutex as well as the mutex for the predicate waiter.&lt;/p&gt;

&lt;p&gt;Two things need to happen for this:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;notifyables need to own a std::list&amp;lt;Notifyable*&amp;gt;&lt;/li&gt;
	&lt;li&gt;NotInterruptible needs to be a thread local&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;(cherry picked from commit 24ebd1d1f6d7a05e80bff9b14fa6a3e2ff35cc86)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c79827714943d9aaca568db3bfabefa99896d065&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c79827714943d9aaca568db3bfabefa99896d065&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2272693" author="xgen-internal-githook" created="Wed, 5 Jun 2019 17:24:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Carey&apos;, &apos;email&apos;: &apos;jcarey@argv.me&apos;, &apos;username&apos;: &apos;hanumantmk&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40908&quot; title=&quot;Alter stdx::condition_variable::_runWithNotifyable to avoid allocations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40908&quot;&gt;&lt;del&gt;SERVER-40908&lt;/del&gt;&lt;/a&gt; !allocs in cv::_runWithNotifyable&lt;/p&gt;

&lt;p&gt;condition_variable::_runWithNotifyable allocates a linked list member&lt;br/&gt;
for the notification list per invocation. It also does this under both&lt;br/&gt;
the condvar mutex as well as the mutex for the predicate waiter.&lt;/p&gt;

&lt;p&gt;Two things need to happen for this:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;notifyables need to own a std::list&amp;lt;Notifyable*&amp;gt;&lt;/li&gt;
	&lt;li&gt;NotInterruptible needs to be a thread local&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/24ebd1d1f6d7a05e80bff9b14fa6a3e2ff35cc86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/24ebd1d1f6d7a05e80bff9b14fa6a3e2ff35cc86&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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