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    <title>MongoDB Jira</title>
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    <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-72616] Remove futex usage in favour of std::atomic/AtomicWord::wait on TicketBroker</title>
                <link>https://jira.mongodb.org/browse/SERVER-72616</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72067&quot; title=&quot;Implement TicketQueue mechanism with futex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72067&quot;&gt;&lt;del&gt;SERVER-72067&lt;/del&gt;&lt;/a&gt; we had to implement the TicketBroker class using raw Linux futex syscalls due to not having C++20 atomics at the time.&lt;/p&gt;

&lt;p&gt;These calls should go away in order to use C++20 atomics once we can use them in the codebase in order to enable cross-platform usage pof the class. Right now these calls block PriorityTicketHolder from being multi-platform since they are tied to Linux.&lt;/p&gt;

&lt;p&gt;Places affected by this have been tagged to this ticket in the comments.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2227652">SERVER-72616</key>
            <summary>Remove futex usage in favour of std::atomic/AtomicWord::wait on TicketBroker</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="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-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                            <label>tech-debt</label>
                    </labels>
                <created>Mon, 9 Jan 2023 12:30:56 +0000</created>
                <updated>Tue, 3 Oct 2023 14:34:21 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5748688" author="JIRAUSER1264163" created="Tue, 3 Oct 2023 14:34:21 +0000"  >&lt;p&gt;Agreed, there&apos;s sadly a lack of support for timeouts in the C++ standard version.&lt;/p&gt;</comment>
                            <comment id="5748494" author="redbeard0531" created="Tue, 3 Oct 2023 13:59:03 +0000"  >&lt;p&gt;I think we should make this depend on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81797&quot; title=&quot;Make our own portable implementation of atomic notify() and wait() with timeout support&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81797&quot;&gt;SERVER-81797&lt;/a&gt; rather than &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72064&quot; title=&quot;Implement AtomicWord::wait similar to std::atomic::wait&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72064&quot;&gt;SERVER-72064&lt;/a&gt; because the feature that was standardized in C++20 doesn&apos;t support timeouts/deadlines, but we need them in this use case (and basically all other ones we have)&lt;/p&gt;</comment>
                            <comment id="5203246" author="haley.connelly" created="Thu, 16 Feb 2023 10:08:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66893&quot; title=&quot;Architecture Guide updates for PM-2935&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66893&quot;&gt;&lt;del&gt;SERVER-66893&lt;/del&gt;&lt;/a&gt; Adds a section to the Architecture Guide about the PriorityTicketHolder and specifies it is only available on linux. Once this ticket is complete, we should update the Architecture Guide to reflect the feature is enabled on all variants&lt;/p&gt;</comment>
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            <issuekey id="2457264">SERVER-81797</issuekey>
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            <issuekey id="2266233">SERVER-74082</issuekey>
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