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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-5739] Race condition in SOMETIMES/MONGO_SOMETIMES macros</title>
                <link>https://jira.mongodb.org/browse/SERVER-5739</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The definition of MONGO_SOMETIMES contains a race condition.  It&apos;s current implementation is as follows:&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;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 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;#define MONGO_SOMETIMES( occasion, howOften ) for( static unsigned occasion = 0; ++occasion % howOften == 0; )&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Plain-and-simple not thread safe.&lt;/p&gt;</description>
                <environment></environment>
        <key id="37553">SERVER-5739</key>
            <summary>Race condition in SOMETIMES/MONGO_SOMETIMES macros</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>platforms-interns-2017</label>
                    </labels>
                <created>Tue, 1 May 2012 17:33:19 +0000</created>
                <updated>Sat, 15 Dec 2018 19:39:53 +0000</updated>
                            <resolved>Fri, 16 Nov 2018 18:38:38 +0000</resolved>
                                    <version>2.1.1</version>
                                    <fixVersion>4.1.6</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2064946" author="xgen-internal-githook" created="Fri, 16 Nov 2018 18:36:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5739&quot; title=&quot;Race condition in SOMETIMES/MONGO_SOMETIMES macros&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5739&quot;&gt;&lt;del&gt;SERVER-5739&lt;/del&gt;&lt;/a&gt; Fix races in RARELY/OCCASIONALLY.&lt;/p&gt;

&lt;p&gt;Switch to using C++ instead of macros.&lt;br/&gt;
Fix &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37247&quot; title=&quot;Rarely macro should log first use of deprecated command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37247&quot;&gt;&lt;del&gt;SERVER-37247&lt;/del&gt;&lt;/a&gt;: these should fire on first hit.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/63e43f1bb47f7bddf3dc37ad03a2bbee6d2a9423&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/63e43f1bb47f7bddf3dc37ad03a2bbee6d2a9423&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1463992" author="acm" created="Thu, 22 Dec 2016 14:53:48 +0000"  >&lt;p&gt;Note that when this ticket was filed, there were in fact two races in the implemenation:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The initialization of the static &lt;tt&gt;occasion&lt;/tt&gt; variable was not thread-safe pre-C++11&lt;/li&gt;
	&lt;li&gt;The increment of the &lt;tt&gt;occasion&lt;/tt&gt; variable was non-atomic.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;While the first of these issues was addressed by our move to C++11 and modernization of the toolchain, the latter has not been. The best solution is to probably declare the &lt;tt&gt;occasion&lt;/tt&gt; variable as a &lt;tt&gt;static std::atomic&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;We should consider, when fixing this, whether these should be 32-bit or 64-bit counters, and use the appropriate fixed-width underlying type for the atomics.&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="607991">SERVER-37247</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="146764">SERVER-14536</issuekey>
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