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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-68528] Remove use of shared_mutex from SchedulingTicketHolder</title>
                <link>https://jira.mongodb.org/browse/SERVER-68528</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The `SchedulingTicketHolder` type &lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/util/concurrency/ticketholder.h#L328-L330&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;uses&lt;/a&gt; `std::shared_mutex`, which is not generally allowed in production mongodb code. If a reader-writer mutex is required, the LockManager&apos;s ResourceMutex type is the currently recommended type.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2105479">SERVER-68528</key>
            <summary>Remove use of shared_mutex from SchedulingTicketHolder</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="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="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 Aug 2022 11:41:32 +0000</created>
                <updated>Sun, 29 Oct 2023 21:34:59 +0000</updated>
                            <resolved>Thu, 8 Sep 2022 10:18:31 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4826594" author="schwerin" created="Wed, 14 Sep 2022 16:45:03 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jordi.olivares-provencio%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;jordi.olivares-provencio@mongodb.com&quot;&gt;jordi.olivares-provencio@mongodb.com&lt;/a&gt;and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch@mongodb.com&quot;&gt;geert.bosch@mongodb.com&lt;/a&gt;for publishing the benchmark and the reasoning for why &lt;tt&gt;shared_mutex&lt;/tt&gt; is appropriate here. I learned things!&lt;/p&gt;</comment>
                            <comment id="4810965" author="xgen-internal-githook" created="Thu, 8 Sep 2022 09:50:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68528&quot; title=&quot;Remove use of shared_mutex from SchedulingTicketHolder&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68528&quot;&gt;&lt;del&gt;SERVER-68528&lt;/del&gt;&lt;/a&gt; Explain shared_mutex in SchedulingTicketHolder&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7da8cf1b0e10cec512ae6a3fc711c880fb77c261&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7da8cf1b0e10cec512ae6a3fc711c880fb77c261&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4808169" author="geert.bosch" created="Wed, 7 Sep 2022 14:37:28 +0000"  >&lt;p&gt;We talked and agree that both &lt;tt&gt;ResourceMutex&lt;/tt&gt; is not appropriate here, and that usual reasons for avoiding &lt;tt&gt;std::shared_mutex&lt;/tt&gt; do not apply:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;no reader or writer starvation is possible, regardless of the policy of the {{shared_mutex }}implementation&lt;/li&gt;
	&lt;li&gt;neither read nor write operations can take long (no potentially blocking calls while holding the mutex, no need for statistics or interruption)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;So, it is ok for the &lt;tt&gt;TicketHolder&lt;/tt&gt; to use the &lt;tt&gt;shared_mutex&lt;/tt&gt; here with an appropriate comment. &lt;/p&gt;</comment>
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