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+<table class="head">
+ <tr>
+ <td class="head-ltitle">PTHREAD_ATTR(3)</td>
+ <td class="head-vol">Library Functions Manual</td>
+ <td class="head-rtitle">PTHREAD_ATTR(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_attr_init</code>,
+ <code class="Nm">pthread_attr_destroy</code>,
+ <code class="Nm">pthread_attr_setstack</code>,
+ <code class="Nm">pthread_attr_getstack</code>,
+ <code class="Nm">pthread_attr_setstacksize</code>,
+ <code class="Nm">pthread_attr_getstacksize</code>,
+ <code class="Nm">pthread_attr_setguardsize</code>,
+ <code class="Nm">pthread_attr_getguardsize</code>,
+ <code class="Nm">pthread_attr_setstackaddr</code>,
+ <code class="Nm">pthread_attr_getstackaddr</code>,
+ <code class="Nm">pthread_attr_setdetachstate</code>,
+ <code class="Nm">pthread_attr_getdetachstate</code>,
+ <code class="Nm">pthread_attr_setinheritsched</code>,
+ <code class="Nm">pthread_attr_getinheritsched</code>,
+ <code class="Nm">pthread_attr_setschedparam</code>,
+ <code class="Nm">pthread_attr_getschedparam</code>,
+ <code class="Nm">pthread_attr_setschedpolicy</code>,
+ <code class="Nm">pthread_attr_getschedpolicy</code>,
+ <code class="Nm">pthread_attr_setscope</code>,
+ <code class="Nm">pthread_attr_getscope</code> &#x2014;
+ <span class="Nd">thread attribute operations</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_attr_init</code>(<var class="Fa" style="white-space: nowrap;">pthread_attr_t
+ *attr</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_destroy</code>(<var class="Fa" style="white-space: nowrap;">pthread_attr_t
+ *attr</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_setstack</code>(<var class="Fa" style="white-space: nowrap;">pthread_attr_t
+ *attr</var>, <var class="Fa" style="white-space: nowrap;"> void
+ *stackaddr</var>, <var class="Fa" style="white-space: nowrap;">size_t
+ stacksize</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_getstack</code>(<var class="Fa" style="white-space: nowrap;">const
+ pthread_attr_t * restrict attr</var>,
+ <var class="Fa" style="white-space: nowrap;">void ** restrict
+ stackaddr</var>, <var class="Fa" style="white-space: nowrap;">size_t *
+ restrict stacksize</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_setstacksize</code>(<var class="Fa" style="white-space: nowrap;">pthread_attr_t
+ *attr</var>, <var class="Fa" style="white-space: nowrap;">size_t
+ stacksize</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_getstacksize</code>(<var class="Fa" style="white-space: nowrap;">const
+ pthread_attr_t *restrict attr</var>,
+ <var class="Fa" style="white-space: nowrap;">size_t *restrict
+ stacksize</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_setguardsize</code>(<var class="Fa" style="white-space: nowrap;">pthread_attr_t
+ *attr</var>, <var class="Fa" style="white-space: nowrap;">size_t
+ guardsize</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_getguardsize</code>(<var class="Fa" style="white-space: nowrap;">const
+ pthread_attr_t * restrict attr</var>,
+ <var class="Fa" style="white-space: nowrap;">size_t * restrict
+ guardsize</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_setstackaddr</code>(<var class="Fa" style="white-space: nowrap;">pthread_attr_t
+ *attr</var>, <var class="Fa" style="white-space: nowrap;">void
+ *stackaddr</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_getstackaddr</code>(<var class="Fa" style="white-space: nowrap;">const
+ pthread_attr_t *attr</var>,
+ <var class="Fa" style="white-space: nowrap;">void **stackaddr</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_setdetachstate</code>(<var class="Fa" style="white-space: nowrap;">pthread_attr_t
+ *attr</var>, <var class="Fa" style="white-space: nowrap;">int
+ detachstate</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_getdetachstate</code>(<var class="Fa" style="white-space: nowrap;">const
+ pthread_attr_t *attr</var>, <var class="Fa" style="white-space: nowrap;">int
+ *detachstate</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_setinheritsched</code>(<var class="Fa" style="white-space: nowrap;">pthread_attr_t
+ *attr</var>, <var class="Fa" style="white-space: nowrap;">int
+ inheritsched</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_getinheritsched</code>(<var class="Fa" style="white-space: nowrap;">const
+ pthread_attr_t *restrict attr</var>,
+ <var class="Fa" style="white-space: nowrap;">int *restrct
+ inheritsched</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_setschedparam</code>(<var class="Fa" style="white-space: nowrap;">pthread_attr_t
+ *attr</var>, <var class="Fa" style="white-space: nowrap;">const struct
+ sched_param *param</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_getschedparam</code>(<var class="Fa" style="white-space: nowrap;">const
+ pthread_attr_t *attr</var>,
+ <var class="Fa" style="white-space: nowrap;">struct sched_param
+ *param</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_setschedpolicy</code>(<var class="Fa" style="white-space: nowrap;">pthread_attr_t
+ *attr</var>, <var class="Fa" style="white-space: nowrap;">int
+ policy</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_getschedpolicy</code>(<var class="Fa" style="white-space: nowrap;">const
+ pthread_attr_t *restrict attr</var>,
+ <var class="Fa" style="white-space: nowrap;">int *restrict
+ policy</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_setscope</code>(<var class="Fa" style="white-space: nowrap;">pthread_attr_t
+ *attr</var>, <var class="Fa" style="white-space: nowrap;">int
+ contentionscope</var>);</p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">pthread_attr_getscope</code>(<var class="Fa" style="white-space: nowrap;">const
+ pthread_attr_t *restrict attr</var>,
+ <var class="Fa" style="white-space: nowrap;">int *restrict
+ contentionscope</var>);</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">Thread attributes are used to specify parameters to
+ <a class="permalink" href="#pthread_create"><code class="Fn" id="pthread_create">pthread_create</code></a>().
+ One attribute object can be used in multiple calls to
+ <code class="Fn">pthread_create</code>(), with or without modifications
+ between calls.</p>
+<p class="Pp" id="pthread_attr_init">The
+ <a class="permalink" href="#pthread_attr_init"><code class="Fn">pthread_attr_init</code></a>()
+ function initializes <var class="Fa">attr</var> with all the default thread
+ attributes.</p>
+<p class="Pp" id="pthread_attr_destroy">The
+ <a class="permalink" href="#pthread_attr_destroy"><code class="Fn">pthread_attr_destroy</code></a>()
+ function destroys <var class="Fa">attr</var>.</p>
+<p class="Pp" id="pthread_attr_set*">The
+ <a class="permalink" href="#pthread_attr_set*"><code class="Fn">pthread_attr_set*</code></a>()
+ functions set the attribute that corresponds to each function name.</p>
+<p class="Pp" id="pthread_attr_get*">The
+ <a class="permalink" href="#pthread_attr_get*"><code class="Fn">pthread_attr_get*</code></a>()
+ functions copy the value of the attribute that corresponds to each function
+ name to the location pointed to by the second function parameter.</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, these functions return 0. Otherwise, an error
+ number is 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_attr_init</code>() function will fail
+ if:</p>
+<dl class="Bl-tag">
+ <dt id="ENOMEM">[<a class="permalink" href="#ENOMEM"><code class="Er">ENOMEM</code></a>]</dt>
+ <dd>Out of memory.</dd>
+</dl>
+<p class="Pp">The <code class="Fn">pthread_attr_destroy</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>Invalid value for <var class="Fa">attr</var>.</dd>
+</dl>
+<p class="Pp">The <code class="Fn">pthread_attr_setstacksize</code>() and
+ <code class="Fn">pthread_attr_setstack</code>() functions will fail if:</p>
+<dl class="Bl-tag">
+ <dt id="EINVAL~2">[<a class="permalink" href="#EINVAL~2"><code class="Er">EINVAL</code></a>]</dt>
+ <dd><var class="Fa">stacksize</var> is less than
+ <code class="Dv">PTHREAD_STACK_MIN</code>.</dd>
+</dl>
+<p class="Pp">The <code class="Fn">pthread_attr_setdetachstate</code>() function
+ will fail if:</p>
+<dl class="Bl-tag">
+ <dt id="EINVAL~3">[<a class="permalink" href="#EINVAL~3"><code class="Er">EINVAL</code></a>]</dt>
+ <dd>Invalid value for <var class="Fa">detachstate</var>.</dd>
+</dl>
+<p class="Pp">The <code class="Fn">pthread_attr_setinheritsched</code>()
+ function will fail if:</p>
+<dl class="Bl-tag">
+ <dt id="EINVAL~4">[<a class="permalink" href="#EINVAL~4"><code class="Er">EINVAL</code></a>]</dt>
+ <dd>Invalid value for <var class="Fa">attr</var>.</dd>
+</dl>
+<p class="Pp">The <code class="Fn">pthread_attr_setschedparam</code>() function
+ will fail if:</p>
+<dl class="Bl-tag">
+ <dt id="EINVAL~5">[<a class="permalink" href="#EINVAL~5"><code class="Er">EINVAL</code></a>]</dt>
+ <dd>Invalid value for <var class="Fa">attr</var>.</dd>
+ <dt id="ENOTSUP">[<a class="permalink" href="#ENOTSUP"><code class="Er">ENOTSUP</code></a>]</dt>
+ <dd>Invalid value for <var class="Fa">param</var>.</dd>
+</dl>
+<p class="Pp">The <code class="Fn">pthread_attr_setschedpolicy</code>() function
+ will fail if:</p>
+<dl class="Bl-tag">
+ <dt id="EINVAL~6">[<a class="permalink" href="#EINVAL~6"><code class="Er">EINVAL</code></a>]</dt>
+ <dd>Invalid value for <var class="Fa">attr</var>.</dd>
+ <dt id="ENOTSUP~2">[<a class="permalink" href="#ENOTSUP~2"><code class="Er">ENOTSUP</code></a>]</dt>
+ <dd>Invalid or unsupported value for <var class="Fa">policy</var>.</dd>
+</dl>
+<p class="Pp">The <code class="Fn">pthread_attr_setscope</code>() function will
+ fail if:</p>
+<dl class="Bl-tag">
+ <dt id="EINVAL~7">[<a class="permalink" href="#EINVAL~7"><code class="Er">EINVAL</code></a>]</dt>
+ <dd>Invalid value for <var class="Fa">attr</var>.</dd>
+ <dt id="ENOTSUP~3">[<a class="permalink" href="#ENOTSUP~3"><code class="Er">ENOTSUP</code></a>]</dt>
+ <dd>Invalid or unsupported value for
+ <var class="Fa">contentionscope</var>.</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_attr_affinity_np(3)</a>,
+ <a class="Xr">pthread_attr_get_np(3)</a>,
+ <a class="Xr">pthread_create(3)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="STANDARDS"><a class="permalink" href="#STANDARDS">STANDARDS</a></h1>
+<p class="Pp"><code class="Fn">pthread_attr_init</code>(),
+ <code class="Fn">pthread_attr_destroy</code>(),
+ <code class="Fn">pthread_attr_setstacksize</code>(),
+ <code class="Fn">pthread_attr_getstacksize</code>(),
+ <code class="Fn">pthread_attr_setstackaddr</code>(),
+ <code class="Fn">pthread_attr_getstackaddr</code>(),
+ <code class="Fn">pthread_attr_setdetachstate</code>(), and
+ <code class="Fn">pthread_attr_getdetachstate</code>() functions conform to
+ <span class="St">ISO/IEC 9945-1:1996 (&#x201C;POSIX.1&#x201D;)</span></p>
+<p class="Pp">The <code class="Fn">pthread_attr_setinheritsched</code>(),
+ <code class="Fn">pthread_attr_getinheritsched</code>(),
+ <code class="Fn">pthread_attr_setschedparam</code>(),
+ <code class="Fn">pthread_attr_getschedparam</code>(),
+ <code class="Fn">pthread_attr_setschedpolicy</code>(),
+ <code class="Fn">pthread_attr_getschedpolicy</code>(),
+ <code class="Fn">pthread_attr_setscope</code>(), and
+ <code class="Fn">pthread_attr_getscope</code>() functions conform to
+ <span class="St">Version&#x00A0;2 of the Single UNIX Specification
+ (&#x201C;SUSv2&#x201D;)</span></p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">August 17, 2018</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>