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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-86269] stdx::condition_variable starves waiters who don&apos;t use waitForConditionOrInterrupt</title>
                <link>https://jira.mongodb.org/browse/SERVER-86269</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Our hand-rolled condition variable implementation &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4dfa65eab841fa816ac96072fa3cf78509abb4a2/src/mongo/stdx/condition_variable.h#L107-L112&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;wakes waiters&lt;/a&gt; that enter through the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4dfa65eab841fa816ac96072fa3cf78509abb4a2/src/mongo/stdx/condition_variable.h#L146&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_runWithNotifyable&lt;/a&gt; entry point (i.e. waitForConditionOrInterrupt) before it signals any waiters who have called regular wait() or wait_until().&lt;/p&gt;

&lt;p&gt;When contended, this completely starves out the regular waiters. I&apos;m not sure if this is intended behavior, but at the very least, the API does not provide the fairness guarantees that a caller may assume.&lt;/p&gt;

&lt;p&gt;It seems like we probably shouldn&apos;t pretend that stdx::condition_variable has the same behavior as a regular condition variable, and require that callers always go through the poll/Baton code or not at all.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2568339">SERVER-86269</key>
            <summary>stdx::condition_variable starves waiters who don&apos;t use waitForConditionOrInterrupt</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Feb 2024 14:36:01 +0000</created>
                <updated>Wed, 7 Feb 2024 01:01:34 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
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