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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>