162 lines
6.0 KiB
HTML
162 lines
6.0 KiB
HTML
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<title>pthread_condattr_destroy</title>
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<basefont size="3"> <a name="pthread_condattr_destroy"></a> <a name="tag_03_519"></a><!-- pthread_condattr_destroy -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_519_01"></a>NAME</h4>
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<blockquote>pthread_condattr_destroy, pthread_condattr_init - destroy and initialize the condition variable attributes
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object</blockquote>
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<h4><a name="tag_03_519_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('THR')">THR</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/pthread.h.html">pthread.h</a>><br>
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<br>
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int pthread_condattr_destroy(pthread_condattr_t *</tt><i>attr</i><tt>);<br>
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int pthread_condattr_init(pthread_condattr_t *</tt><i>attr</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border=
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"0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_519_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>pthread_condattr_destroy</i>() function shall destroy a condition variable attributes object; the object becomes, in
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effect, uninitialized. An implementation may cause <i>pthread_condattr_destroy</i>() to set the object referenced by <i>attr</i> to
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an invalid value. A destroyed <i>attr</i> attributes object can be reinitialized using <i>pthread_condattr_init</i>(); the results
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of otherwise referencing the object after it has been destroyed are undefined.</p>
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<p>The <i>pthread_condattr_init</i>() function shall initialize a condition variable attributes object <i>attr</i> with the default
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value for all of the attributes defined by the implementation.</p>
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<p>Results are undefined if <i>pthread_condattr_init</i>() is called specifying an already initialized <i>attr</i> attributes
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object.</p>
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<p>After a condition variable attributes object has been used to initialize one or more condition variables, any function affecting
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the attributes object (including destruction) shall not affect any previously initialized condition variables.</p>
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<p>This volume of IEEE Std 1003.1-2001 requires two attributes, the <i>clock</i> attribute and the <i>process-shared</i>
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attribute.</p>
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<p>Additional attributes, their default values, and the names of the associated functions to get and set those attribute values are
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implementation-defined.</p>
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</blockquote>
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<h4><a name="tag_03_519_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If successful, the <i>pthread_condattr_destroy</i>() and <i>pthread_condattr_init</i>() functions shall return zero; otherwise,
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an error number shall be returned to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_519_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>pthread_condattr_destroy</i>() function may fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The value specified by <i>attr</i> is invalid.</dd>
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</dl>
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<p>The <i>pthread_condattr_init</i>() function shall fail if:</p>
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<dl compact>
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<dt>[ENOMEM]</dt>
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<dd>Insufficient memory exists to initialize the condition variable attributes object.</dd>
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</dl>
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<p>These functions shall not return an error code of [EINTR].</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_519_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_519_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_519_08"></a>RATIONALE</h4>
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<blockquote>
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<p>See <a href="pthread_attr_init.html"><i>pthread_attr_init</i>()</a> and <a href=
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"pthread_mutex_init.html"><i>pthread_mutex_init</i>()</a> .</p>
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<p>A <i>process-shared</i> attribute has been defined for condition variables for the same reason it has been defined for
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mutexes.</p>
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</blockquote>
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<h4><a name="tag_03_519_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_519_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="pthread_attr_destroy.html"><i>pthread_attr_destroy</i>()</a> , <a href=
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"pthread_cond_destroy.html"><i>pthread_cond_destroy</i>()</a> , <a href=
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"pthread_condattr_getpshared.html"><i>pthread_condattr_getpshared</i>()</a> , <a href=
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"pthread_create.html"><i>pthread_create</i>()</a> , <a href="pthread_mutex_destroy.html"><i>pthread_mutex_destroy</i>()</a> , the
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Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/pthread.h.html"><i><pthread.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_519_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 5. Included for alignment with the POSIX Threads Extension.</p>
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</blockquote>
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<h4><a name="tag_03_519_12"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>pthread_condattr_destroy</i>() and <i>pthread_condattr_init</i>() functions are marked as part of the Threads option.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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