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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
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-<table class="head">
- <tr>
- <td class="head-ltitle">PTHREAD_MUTEX_TRYLOCK(3)</td>
- <td class="head-vol">Library Functions Manual</td>
- <td class="head-rtitle">PTHREAD_MUTEX_TRYLOCK(3)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">pthread_mutex_trylock</code> &#x2014;
- <span class="Nd">attempt to lock a mutex without blocking</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="LIBRARY"><a class="permalink" href="#LIBRARY">LIBRARY</a></h1>
-<p class="Pp"><span class="Lb">POSIX Threads Library (libpthread,
- -lpthread)</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="In">#include
- &lt;<a class="In">pthread.h</a>&gt;</code></p>
-<p class="Pp"><var class="Ft">int</var>
- <br/>
- <code class="Fn">pthread_mutex_trylock</code>(<var class="Fa" style="white-space: nowrap;">pthread_mutex_t
- *mutex</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The
- <a class="permalink" href="#pthread_mutex_trylock"><code class="Fn" id="pthread_mutex_trylock">pthread_mutex_trylock</code></a>()
- function locks <var class="Fa">mutex</var>. If the mutex is already locked,
- <code class="Fn">pthread_mutex_trylock</code>() will not block waiting for
- the mutex, but will return an error condition.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
- VALUES</a></h1>
-<p class="Pp">If successful, <code class="Fn">pthread_mutex_trylock</code>()
- will return zero, otherwise an error number will be returned to indicate the
- error.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="ERRORS"><a class="permalink" href="#ERRORS">ERRORS</a></h1>
-<p class="Pp">The <code class="Fn">pthread_mutex_trylock</code>() function will
- fail if:</p>
-<dl class="Bl-tag">
- <dt id="EINVAL">[<a class="permalink" href="#EINVAL"><code class="Er">EINVAL</code></a>]</dt>
- <dd>The value specified by <var class="Fa">mutex</var> is invalid.</dd>
- <dt id="EBUSY">[<a class="permalink" href="#EBUSY"><code class="Er">EBUSY</code></a>]</dt>
- <dd><var class="Fa">Mutex</var> is already locked.</dd>
- <dt id="EOWNERDEAD">[<a class="permalink" href="#EOWNERDEAD"><code class="Er">EOWNERDEAD</code></a>]</dt>
- <dd>The argument <var class="Fa">mutex</var> points to a robust mutex and the
- process containing the previous owning thread terminated while holding the
- mutex lock. The lock was granted to the caller and it is up to the new
- owner to make the state consistent.</dd>
- <dt id="ENOTRECOVERABLE">[<a class="permalink" href="#ENOTRECOVERABLE"><code class="Er">ENOTRECOVERABLE</code></a>]</dt>
- <dd>The state protected by the <var class="Fa">mutex</var> is not
- recoverable.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">pthread_mutex_consistent(3)</a>,
- <a class="Xr">pthread_mutex_destroy(3)</a>,
- <a class="Xr">pthread_mutex_init(3)</a>,
- <a class="Xr">pthread_mutex_lock(3)</a>,
- <a class="Xr">pthread_mutex_unlock(3)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="STANDARDS"><a class="permalink" href="#STANDARDS">STANDARDS</a></h1>
-<p class="Pp">The <code class="Fn">pthread_mutex_trylock</code>() function
- conforms to <span class="St">ISO/IEC 9945-1:1996
- (&#x201C;POSIX.1&#x201D;)</span>.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">August 7, 2019</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>