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    <link>https://jira.mongodb.org</link>
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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-5738] Race condition in ONCE/MONGO_ONCE macros</title>
                <link>https://jira.mongodb.org/browse/SERVER-5738</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The definition of MONGO_ONCE 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_ONCE for( static bool undone = true; undone; undone = false )&lt;/span&gt;&lt;/pre&gt;
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&lt;p&gt;Plain-and-simple not thread safe.&lt;/p&gt;</description>
                <environment></environment>
        <key id="37552">SERVER-5738</key>
            <summary>Race condition in ONCE/MONGO_ONCE 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="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 May 2012 17:18:52 +0000</created>
                <updated>Wed, 5 Apr 2017 11:44:30 +0000</updated>
                            <resolved>Wed, 4 Jan 2017 16:37:17 +0000</resolved>
                                    <version>2.1.1</version>
                                    <fixVersion>3.5.2</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1469245" author="xgen-internal-githook" created="Wed, 4 Jan 2017 16:36:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5738&quot; title=&quot;Race condition in ONCE/MONGO_ONCE macros&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5738&quot;&gt;&lt;del&gt;SERVER-5738&lt;/del&gt;&lt;/a&gt; Remove MONGO_ONCE in favor of std::call_once&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b7c7462c564298da54333775f7734e2623dfb08b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b7c7462c564298da54333775f7734e2623dfb08b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1463989" author="acm" created="Thu, 22 Dec 2016 14:49:02 +0000"  >&lt;p&gt;I&apos;m in favor of std::call_once.&lt;/p&gt;</comment>
                            <comment id="1463543" author="mark.benvenuto" created="Wed, 21 Dec 2016 21:42:24 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=acm&quot; class=&quot;user-hover&quot; rel=&quot;acm&quot;&gt;acm&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=adam.martin&quot; class=&quot;user-hover&quot; rel=&quot;adam.martin&quot;&gt;adam.martin&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;There are two ways to fix this&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Transition to &lt;tt&gt;std::atomic&lt;/tt&gt; or the like for the &lt;tt&gt;bool&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;Remove the macro and use &lt;tt&gt;std::call_once&lt;/tt&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;I prefer we just remove and use &lt;tt&gt;std::call_once&lt;/tt&gt; instead.&lt;/p&gt;

&lt;p&gt;There are two uses to prevent log spam (authz_session_external_state_server_common.cpp, and btree_logic.cpp), and there is one case in breakpoint(). Other then a test case, it is only used in three places.&lt;/p&gt;</comment>
                            <comment id="1461679" author="mark.benvenuto" created="Mon, 19 Dec 2016 22:57:23 +0000"  >&lt;p&gt;A better replacement for this in C++11 is std::call_once. &lt;a href=&quot;http://en.cppreference.com/w/cpp/thread/call_once&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://en.cppreference.com/w/cpp/thread/call_once&lt;/a&gt;.&lt;/p&gt;</comment>
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