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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>
    </build-info>


<item>
            <title>[SERVER-72064] Implement AtomicWord::wait similar to std::atomic::wait</title>
                <link>https://jira.mongodb.org/browse/SERVER-72064</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In C++20 the functionality for waiting on an atomic variable is implemented in &lt;a href=&quot;https://en.cppreference.com/w/cpp/atomic/atomic/wait&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;std::atomic::wait&lt;/a&gt;. This essentially brings an implementation of futexes that is cross-platform.&lt;/p&gt;

&lt;p&gt;We should investigate whether we can implement this functionality in our AtomicWord once C++20 is allowed in the codebase.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2209237">SERVER-72064</key>
            <summary>Implement AtomicWord::wait similar to std::atomic::wait</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-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Dec 2022 11:00:57 +0000</created>
                <updated>Tue, 3 Oct 2023 14:06:36 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5748534" author="redbeard0531" created="Tue, 3 Oct 2023 14:06:36 +0000"  >&lt;p&gt;I propose closing this as WONTFIX in favor of &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;. We can&apos;t use the APIs standardized in C++20 because they don&apos;t support deadlines or timeouts, while effectively all of our use cases need them.&lt;/p&gt;

&lt;p&gt;I think adding the APIs directly to &lt;tt&gt;AtomicWord&amp;lt;T&amp;gt;&lt;/tt&gt; would be a mistake because it limits our flexibility, assuming we want to keep the rule that &lt;tt&gt;sizeof(AtomicWord&amp;lt;T&amp;gt;) == sizeof(T)&lt;/tt&gt;. Using a separate &lt;tt&gt;AtomicWaitable&amp;lt;T&amp;gt;&lt;/tt&gt; template that exposes the &lt;tt&gt;AtomicWord&amp;lt;T&amp;gt;&lt;/tt&gt; API in addition to the wait/notify functions, gives us the flexability to make its size vary based on the requirement to efficiently wait, without impacting the size of all &lt;tt&gt;AtomicWords&lt;/tt&gt;.&lt;/p&gt;</comment>
                            <comment id="5051907" author="billy.donahue" created="Tue, 13 Dec 2022 17:52:43 +0000"  >&lt;p&gt;I would switch to &lt;tt&gt;std::atomic&lt;/tt&gt; the second &lt;tt&gt;AtomicWord&lt;/tt&gt; is missing something I need. This &lt;tt&gt;#if&lt;/tt&gt; -protected code wouldn&apos;t be future-proofing, because you can&apos;t use it until &lt;tt&gt;__cpp_lib_atomic_wait&lt;/tt&gt; exists. There is no fallback &lt;tt&gt;#else&lt;/tt&gt; clause. The &lt;tt&gt;AtomicWord&lt;/tt&gt; functions just won&apos;t exist at all until &lt;tt&gt;std::atomic&lt;/tt&gt; supports them.&lt;/p&gt;</comment>
                            <comment id="5051776" author="JIRAUSER1264163" created="Tue, 13 Dec 2022 17:22:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=billy.donahue%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;billy.donahue@mongodb.com&quot;&gt;billy.donahue@mongodb.com&lt;/a&gt; that would very much be appreciated and would future proof the code for when it becomes available. In my mind it would try to mimick as much as possible the same semantics of the corresponding methods in std::atomic.&lt;/p&gt;</comment>
                            <comment id="5051614" author="billy.donahue" created="Tue, 13 Dec 2022 16:37:12 +0000"  >&lt;p&gt;We could add this feature right now, enabled by the feature test macro &lt;tt&gt;__cpp_lib_atomic_wait&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;mongo::AtomicWord&lt;/tt&gt; just forwards calls to the underlying &lt;tt&gt;std::atomic&lt;/tt&gt;, and these member functions could be added pretty directly, under control of an if block.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#if __cpp_lib_atomic_wait &amp;gt;= 201907L&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    wait(...)&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    notifyOne(...)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    notifyAll(...)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#endif&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</comment>
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                                                        </outwardlinks>
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                                        <issuelink>
            <issuekey id="2227652">SERVER-72616</issuekey>
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                                        <issuelink>
            <issuekey id="2457264">SERVER-81797</issuekey>
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                            </outwardlinks>
                                                                <inwardlinks description="is related to">
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            <issuekey id="2208210">SERVER-72033</issuekey>
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