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    <title>MongoDB Jira</title>
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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-30706] Create specializations of AtomicWord&lt;T&gt; that are lock-free for eligible user define dtypes</title>
                <link>https://jira.mongodb.org/browse/SERVER-30706</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;AtomicWord&amp;lt;T&amp;gt; is implemented in terms of std::atomic&amp;lt;T&amp;gt;. However, until C++17, there is no way to determine at compile time if std::atomic&amp;lt;T&amp;gt; has a lock-free implementation. This task is to provide a specialization of AtomicWord&amp;lt;T&amp;gt; for user-defined types T that is definitely lock free when the correspondingly sized integer type&apos;s atomic is also lock free.&lt;/p&gt;

&lt;p&gt;It should be a compile-time error to create an AtomicWord&amp;lt;T&amp;gt; for a user-defined type whose implementation would otherwise require locks. As part of this task, the implementer should also write runtime tests that confirm that the AtomicWord instantiations for integer types are actually lock free by using std::atomic::is_lock_free().&lt;/p&gt;</description>
                <environment></environment>
        <key id="417315">SERVER-30706</key>
            <summary>Create specializations of AtomicWord&lt;T&gt; that are lock-free for eligible user define dtypes</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="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 16 Aug 2017 23:04:52 +0000</created>
                <updated>Mon, 30 Oct 2023 23:14:14 +0000</updated>
                            <resolved>Mon, 21 Aug 2017 17:06:50 +0000</resolved>
                                                    <fixVersion>3.5.12</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1653023" author="xgen-internal-githook" created="Mon, 21 Aug 2017 17:06:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;hanumantmk&apos;, &apos;email&apos;: &apos;jcarey@argv.me&apos;, &apos;name&apos;: &apos;Jason Carey&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30706&quot; title=&quot;Create specializations of AtomicWord&amp;lt;T&amp;gt; that are lock-free for eligible user define dtypes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30706&quot;&gt;&lt;del&gt;SERVER-30706&lt;/del&gt;&lt;/a&gt; Support for non-int AtomicWord&amp;lt;T&amp;gt;&lt;/p&gt;

&lt;p&gt;Restricts the base AtomicWord template to integral types and adds&lt;br/&gt;
another specialization which uses a std::atomic&amp;lt;uint64_t&amp;gt; for&lt;br/&gt;
non-integral types (by doing atomic 64 bit ops, then copying bytes in&lt;br/&gt;
and out of the user type assuming it&apos;s Trivially copyable).&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0fe978629f685f19e93ebc16ea2f311590850220&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0fe978629f685f19e93ebc16ea2f311590850220&lt;/a&gt;&lt;/p&gt;</comment>
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