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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[CDRIVER-3702] Add test assertions to check lock preconditions</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-3702</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;Many functions in mongoc-topology.c, mongoc-topology-description.c, mongoc-topology-background-monitoring.c, and (after &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-3535&quot; title=&quot;Reduce Client Time To Recovery On Topology Changes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-3535&quot;&gt;&lt;del&gt;CDRIVER-3535&lt;/del&gt;&lt;/a&gt;) mongoc-server-monitor.c require callers to lock a mutex. This precondition is usually documented in a function level comment:&lt;/p&gt;

&lt;p/&gt;
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					&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; *--------------------------------------------------------------------------&lt;/span&gt;&lt;/pre&gt;
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					&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; *&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;   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; * mongoc_topology_scan_once --&lt;/span&gt;&lt;/pre&gt;
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					&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; *&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;   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; *      Runs a single complete scan.&lt;/span&gt;&lt;/pre&gt;
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					&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; *&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;   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: this method expects @topology&apos;s mutex to be locked on entry.&lt;/span&gt;&lt;/pre&gt;
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					&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; *&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;   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: this method unlocks and re-locks @topology&apos;s mutex.&lt;/span&gt;&lt;/pre&gt;
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					&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; *&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;   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; *      Only runs for single threaded monitoring. (obey_cooldown is always&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;   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; *      true).&lt;/span&gt;&lt;/pre&gt;
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					&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; */&lt;/span&gt;&lt;/pre&gt;
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					&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;static void&lt;/span&gt;&lt;/pre&gt;
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					&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;mongoc_topology_scan_once (mongoc_topology_t *topology, bool obey_cooldown)&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Though sometimes these preconditions are missed. Here is one such real life example: &lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/pull/609#discussion_r424602399&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/pull/609#discussion_r424602399&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;It may be worth adding test-only assertions in these functions to check that the expected mutex is locked. &lt;tt&gt;pthread_mutex_try_lock&lt;/tt&gt; could accomplish this on POSIX and &lt;a href=&quot;https://docs.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-tryentercriticalsection?redirectedfrom=MSDN&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;TryEnterCriticalSection&lt;/a&gt; on Windows.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1372060">CDRIVER-3702</key>
            <summary>Add test assertions to check lock preconditions</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="andrew.witten@mongodb.com">Andrew Witten</assignee>
                                    <reporter username="kevin.albertson@mongodb.com">Kevin Albertson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 4 Jun 2020 14:58:11 +0000</created>
                <updated>Sat, 28 Oct 2023 11:28:44 +0000</updated>
                            <resolved>Fri, 24 Jul 2020 17:05:48 +0000</resolved>
                                                    <fixVersion>1.18.0</fixVersion>
                    <fixVersion>1.18.0-alpha</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3301277" author="JIRAUSER1253381" created="Fri, 24 Jul 2020 17:06:30 +0000"  >&lt;p&gt;PR: &lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/pull/649&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/pull/649&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3301034" author="xgen-internal-githook" created="Fri, 24 Jul 2020 15:29:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Witten&apos;, &apos;email&apos;: &apos;andrew.witten@mongodb.com&apos;, &apos;username&apos;: &apos;awitten1&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-3702&quot; title=&quot;Add test assertions to check lock preconditions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-3702&quot;&gt;&lt;del&gt;CDRIVER-3702&lt;/del&gt;&lt;/a&gt; adds runtime debug assertions &lt;/p&gt;

&lt;p&gt;Adds runtime debug assertions.  Enable with configuration flag -DENABLE_DEBUG_ASSERTIONS=ON.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/98fde46cad0d89afa61fc22b4845232610fc2279&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/98fde46cad0d89afa61fc22b4845232610fc2279&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3190086" author="kevin.albertson" created="Thu, 4 Jun 2020 15:09:29 +0000"  >&lt;p&gt;Note, we already have test-only code compiled in for test-libmongoc via &lt;a href=&quot;http://mongoc.org/libbson/current/valgrind.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;-DBSON_MEMCHECK&lt;/a&gt;. That define makes an ABI breaking change, and is only suitable for testing, so it is not a cmake option. We could follow suit and add another define to enable test assertions. As a note, I think there is a slight danger of adding a lot of test specific code, in that it takes the test runner a little further from testing reality. But for assertions like this, I think it is safe to do so.&lt;/p&gt;</comment>
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