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            <title>[SERVER-13988] mongo::sorter::nextFileNumber incorrectly assumes thread-safe initialization of function statics</title>
                <link>https://jira.mongodb.org/browse/SERVER-13988</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/sorter/sorter.cpp#L768&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/sorter/sorter.cpp#L768&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;In C&amp;#43;&amp;#43;03, the initialization of function statics is not thread-safe (it is in C&amp;#43;&amp;#43;11). While some compilers, notably GCC, actually implement thread-safe statics in C&amp;#43;&amp;#43;03 mode by default unless asked not to, other compilers do not.&lt;/p&gt;

&lt;p&gt;On such platforms, it could be possible for the atomic to be initialized twice, probably leading to inconsistent results.&lt;/p&gt;</description>
                <environment></environment>
        <key id="137144">SERVER-13988</key>
            <summary>mongo::sorter::nextFileNumber incorrectly assumes thread-safe initialization of function statics</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                    </labels>
                <created>Mon, 19 May 2014 14:47:48 +0000</created>
                <updated>Wed, 4 Feb 2015 19:58:49 +0000</updated>
                            <resolved>Sat, 10 Jan 2015 18:00:28 +0000</resolved>
                                                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="801824" author="schwerin" created="Sat, 10 Jan 2015 18:00:28 +0000"  >&lt;p&gt;If we raise the minimum supported compiler version on Windows to MSVC 2013R2, then all of our supported compilers provide thread-safe static initializers, anyhow. That&apos;s a better solution, given we already require MSVC 2013.&lt;/p&gt;</comment>
                            <comment id="588915" author="mark.benvenuto" created="Mon, 19 May 2014 15:05:12 +0000"  >&lt;p&gt;MSVC just added support for thread-safe function local statics in VS2013 Update 2.&lt;/p&gt;</comment>
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