159 lines
6.0 KiB
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159 lines
6.0 KiB
HTML
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<title>pthread_condattr_getpshared</title>
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<basefont size="3"> <a name="pthread_condattr_getpshared"></a> <a name="tag_03_521"></a><!-- pthread_condattr_getpshared -->
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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_521_01"></a>NAME</h4>
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<blockquote>pthread_condattr_getpshared, pthread_condattr_setpshared - get and set the process-shared condition variable
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attributes</blockquote>
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<h4><a name="tag_03_521_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 TSH')">THR TSH</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_getpshared(const pthread_condattr_t *restrict</tt> <i>attr</i><tt>,<br>
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int *restrict</tt> <i>pshared</i><tt>);<br>
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int pthread_condattr_setpshared(pthread_condattr_t *</tt><i>attr</i><tt>,<br>
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int</tt> <i>pshared</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_521_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>pthread_condattr_getpshared</i>() function shall obtain the value of the <i>process-shared</i> attribute from the
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attributes object referenced by <i>attr</i>. The <i>pthread_condattr_setpshared</i>() function shall set the <i>process-shared</i>
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attribute in an initialized attributes object referenced by <i>attr</i>.</p>
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<p>The <i>process-shared</i> attribute is set to PTHREAD_PROCESS_SHARED to permit a condition variable to be operated upon by any
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thread that has access to the memory where the condition variable is allocated, even if the condition variable is allocated in
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memory that is shared by multiple processes. If the <i>process-shared</i> attribute is PTHREAD_PROCESS_PRIVATE, the condition
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variable shall only be operated upon by threads created within the same process as the thread that initialized the condition
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variable; if threads of differing processes attempt to operate on such a condition variable, the behavior is undefined. The default
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value of the attribute is PTHREAD_PROCESS_PRIVATE.</p>
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</blockquote>
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<h4><a name="tag_03_521_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If successful, the <i>pthread_condattr_setpshared</i>() function shall return zero; otherwise, an error number shall be returned
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to indicate the error.</p>
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<p>If successful, the <i>pthread_condattr_getpshared</i>() function shall return zero and store the value of the
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<i>process-shared</i> attribute of <i>attr</i> into the object referenced by the <i>pshared</i> parameter. Otherwise, an error
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number shall be returned to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_521_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>pthread_condattr_getpshared</i>() and <i>pthread_condattr_setpshared</i>() functions 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_setpshared</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 new value specified for the attribute is outside the range of legal values for that attribute.</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_521_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_521_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_521_08"></a>RATIONALE</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_521_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_521_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="pthread_create.html"><i>pthread_create</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_destroy.html"><i>pthread_condattr_destroy</i>()</a> , <a href=
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"pthread_mutex_destroy.html"><i>pthread_mutex_destroy</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a
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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_521_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_521_12"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>pthread_condattr_getpshared</i>() and <i>pthread_condattr_setpshared</i>() functions are marked as part of the Threads
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and Thread Process-Shared Synchronization options.</p>
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<p>The <b>restrict</b> keyword is added to the <i>pthread_condattr_getpshared</i>() prototype for alignment with the
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ISO/IEC 9899:1999 standard.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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