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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-84083] Document thread-safety semantics for ASIOSession</title>
                <link>https://jira.mongodb.org/browse/SERVER-84083</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Discussion in the PR for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72605&quot; title=&quot;Ensure and document thread-safety semantics for `Session::end()`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72605&quot;&gt;&lt;del&gt;SERVER-72605&lt;/del&gt;&lt;/a&gt; uncovered some ambiguities with respect to the thread-safeness of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/11e4b5c0f29a45fd2928ca75b8c386900aef440b/src/mongo/transport/asio/asio_session_impl.h#L52&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ASIOSession&lt;/a&gt;. While the synchronous API is guaranteed to be called from only one thread, the asynchronous API can be called from multiple threads. It appears that there is thread-unsafe behavior in the asynchronous API, specifically with respect to calling thread-unsafe methods on the `_socket` and `_sslSocket` members, whether directly or via the `getSocket` &lt;a href=&quot;https://github.com/mongodb/mongo/blob/11e4b5c0f29a45fd2928ca75b8c386900aef440b/src/mongo/transport/asio/asio_session_impl.cpp#L371&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;method&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Examine all uses of the asynchronous API (particular methods of interest listed below), determine whether they might be called from multiple threads and whether they are already self-synchronizing, and resolve any thread-unsafe behavior (or file tickets requesting such changes).&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;`asyncSourceMessage`&lt;/li&gt;
	&lt;li&gt;`asyncSinkMessage`&lt;/li&gt;
	&lt;li&gt;`cancelAsyncOperations`&lt;/li&gt;
	&lt;li&gt;`isConnected`&lt;/li&gt;
&lt;/ul&gt;
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        <key id="2522251">SERVER-84083</key>
            <summary>Document thread-safety semantics for ASIOSession</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="12452" iconUrl="https://jira.mongodb.org/images/icons/statuses/generic.png" description="">Needs Scheduling</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="james.bronsted@mongodb.com">James Bronsted</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Dec 2023 23:01:00 +0000</created>
                <updated>Tue, 12 Dec 2023 01:00:36 +0000</updated>
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