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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>pthread_condattr_getpshared</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="pthread_condattr_getpshared"></a> <a name="tag_03_521"></a><!-- pthread_condattr_getpshared --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_521_01"></a>NAME</h4><blockquote>pthread_condattr_getpshared, pthread_condattr_setpshared - get and set the process-shared condition variableattributes</blockquote><h4><a name="tag_03_521_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('THR TSH')">THR TSH</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/pthread.h.html">pthread.h</a>><br><br> int pthread_condattr_getpshared(const pthread_condattr_t *restrict</tt> <i>attr</i><tt>,<br> int *restrict</tt> <i>pshared</i><tt>);<br> int pthread_condattr_setpshared(pthread_condattr_t *</tt><i>attr</i><tt>,<br> int</tt> <i>pshared</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_521_03"></a>DESCRIPTION</h4><blockquote><p>The <i>pthread_condattr_getpshared</i>() function shall obtain the value of the <i>process-shared</i> attribute from theattributes object referenced by <i>attr</i>. The <i>pthread_condattr_setpshared</i>() function shall set the <i>process-shared</i>attribute in an initialized attributes object referenced by <i>attr</i>.</p><p>The <i>process-shared</i> attribute is set to PTHREAD_PROCESS_SHARED to permit a condition variable to be operated upon by anythread that has access to the memory where the condition variable is allocated, even if the condition variable is allocated inmemory that is shared by multiple processes. If the <i>process-shared</i> attribute is PTHREAD_PROCESS_PRIVATE, the conditionvariable shall only be operated upon by threads created within the same process as the thread that initialized the conditionvariable; if threads of differing processes attempt to operate on such a condition variable, the behavior is undefined. The defaultvalue of the attribute is PTHREAD_PROCESS_PRIVATE.</p></blockquote><h4><a name="tag_03_521_04"></a>RETURN VALUE</h4><blockquote><p>If successful, the <i>pthread_condattr_setpshared</i>() function shall return zero; otherwise, an error number shall be returnedto indicate the error.</p><p>If successful, the <i>pthread_condattr_getpshared</i>() function shall return zero and store the value of the<i>process-shared</i> attribute of <i>attr</i> into the object referenced by the <i>pshared</i> parameter. Otherwise, an errornumber shall be returned to indicate the error.</p></blockquote><h4><a name="tag_03_521_05"></a>ERRORS</h4><blockquote><p>The <i>pthread_condattr_getpshared</i>() and <i>pthread_condattr_setpshared</i>() functions may fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The value specified by <i>attr</i> is invalid.</dd></dl><p>The <i>pthread_condattr_setpshared</i>() function may fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The new value specified for the attribute is outside the range of legal values for that attribute.</dd></dl><p>These functions shall not return an error code of [EINTR].</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_521_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_521_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_521_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_521_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_521_10"></a>SEE ALSO</h4><blockquote><p><a href="pthread_create.html"><i>pthread_create</i>()</a> , <a href="pthread_cond_destroy.html"><i>pthread_cond_destroy</i>()</a> , <a href="pthread_condattr_destroy.html"><i>pthread_condattr_destroy</i>()</a> , <a href="pthread_mutex_destroy.html"><i>pthread_mutex_destroy</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <ahref="../basedefs/pthread.h.html"><i><pthread.h></i></a></p></blockquote><h4><a name="tag_03_521_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 5. Included for alignment with the POSIX Threads Extension.</p></blockquote><h4><a name="tag_03_521_12"></a>Issue 6</h4><blockquote><p>The <i>pthread_condattr_getpshared</i>() and <i>pthread_condattr_setpshared</i>() functions are marked as part of the Threadsand Thread Process-Shared Synchronization options.</p><p>The <b>restrict</b> keyword is added to the <i>pthread_condattr_getpshared</i>() prototype for alignment with theISO/IEC 9899:1999 standard.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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