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-<table class="head">
- <tr>
- <td class="head-ltitle">PTHREAD_ONCE(3)</td>
- <td class="head-vol">Library Functions Manual</td>
- <td class="head-rtitle">PTHREAD_ONCE(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_once</code> &#x2014;
- <span class="Nd">dynamic package initialization</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">pthread_once_t <var class="Fa">once_control</var> =
- PTHREAD_ONCE_INIT;
- <br/>
- <var class="Ft">int</var>
- <br/>
- <code class="Fn">pthread_once</code>(<var class="Fa" style="white-space: nowrap;">pthread_once_t
- *once_control</var>, <var class="Fa" style="white-space: nowrap;">void
- (*init_routine)(void)</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The first call to
- <a class="permalink" href="#pthread_once"><code class="Fn" id="pthread_once">pthread_once</code></a>()
- by any thread in a process, with a given <var class="Fa">once_control</var>,
- will call the
- <a class="permalink" href="#init_routine"><code class="Fn" id="init_routine">init_routine</code></a>()
- with no arguments. Subsequent calls to
- <code class="Fn">pthread_once</code>() with the same
- <var class="Fa">once_control</var> will not call the
- <code class="Fn">init_routine</code>(). On return from
- <code class="Fn">pthread_once</code>(), it is guaranteed that
- <code class="Fn">init_routine</code>() has completed. The
- <var class="Fa">once_control</var> parameter is used to determine whether
- the associated initialization routine has been called.</p>
-<p class="Pp" id="pthread_once~2">The function
- <a class="permalink" href="#pthread_once~2"><code class="Fn">pthread_once</code></a>()
- is not a cancellation point. However, if
- <a class="permalink" href="#init_routine~2"><code class="Fn" id="init_routine~2">init_routine</code></a>()
- is a cancellation point and is cancelled, the effect on
- <var class="Fa">once_control</var> is as if
- <code class="Fn">pthread_once</code>() was never called.</p>
-<p class="Pp">The constant <var class="Fa">PTHREAD_ONCE_INIT</var> is defined by
- header <code class="In">&lt;<a class="In">pthread.h</a>&gt;</code>.</p>
-<p class="Pp" id="pthread_once~3">The behavior of
- <a class="permalink" href="#pthread_once~3"><code class="Fn">pthread_once</code></a>()
- is undefined if <var class="Fa">once_control</var> has automatic storage
- duration or is not initialized by
- <var class="Fa">PTHREAD_ONCE_INIT</var>.</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, the <code class="Fn">pthread_once</code>() function
- 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">None.</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_once</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">April 4, 1996</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>