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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-4974] better document thread safety of BSONObj</title>
                <link>https://jira.mongodb.org/browse/SERVER-4974</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There&apos;s a comment at the top of BSONObj about thread safety that seems out of date.&lt;/p&gt;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;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;       Note that BSONObj&apos;s have a smart pointer capability built in -- so you can&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;       pass them around by value.  The reference counts used to implement this&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;       do not use locking, so copying and destroying BSONObj&apos;s are not thread-safe&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;       operations.&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;It looks like references are counted via AtomicUInt so the counting seems thread safe.  And it looks like the thread safety rules are similar to those for shared_ptr, but it would be good to check that and document.&lt;/p&gt;</description>
                <environment></environment>
        <key id="30659">SERVER-4974</key>
            <summary>better document thread safety of BSONObj</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-platform">DO NOT USE - Backlog - Platform Team</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                            <label>move-sa</label>
                            <label>neweng</label>
                    </labels>
                <created>Wed, 15 Feb 2012 06:14:39 +0000</created>
                <updated>Tue, 10 May 2022 21:28:59 +0000</updated>
                                                                            <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4539889" author="steven.vannelli" created="Tue, 10 May 2022 21:28:59 +0000"  >&lt;p&gt;Moving this ticket to the Backlog and removing the &quot;Backlog&quot; fixVersion as per our latest policy for using fixVersions. &lt;/p&gt;</comment>
                            <comment id="1204212" author="jason.carey" created="Tue, 15 Mar 2016 18:23:39 +0000"  >&lt;p&gt;The work here is to change the comment at the top of BSONObj&lt;/p&gt;</comment>
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