📄 pthread_condattr_getpshared.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>pthread_condattr_getpshared</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_007_1306"> </a>NAME</h4><blockquote>pthread_condattr_getpshared, pthread_condattr_setpshared - get and set the process-shared condition variable attributes</blockquote><h4><a name = "tag_000_007_1307"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="pthread.h.html">pthread.h</a>>int pthread_condattr_getpshared(const pthread_condattr_t *<i>attr</i>, int *<i>pshared</i>);int pthread_condattr_setpshared(pthread_condattr_t *<i>attr</i>, int <i>pshared</i>);</code></pre></blockquote><h4><a name = "tag_000_007_1308"> </a>DESCRIPTION</h4><blockquote>The<i>pthread_condattr_getpshared()</i>function obtains the value of the<i>process-shared</i>attribute from the attributes object referenced by<i>attr</i>.The<i>pthread_condattr_setpshared()</i>function is used to set the<i>process-shared</i>attribute in an initialised attributes object referenced by<i>attr</i>.<p>The<i>process-shared</i>attribute is set to PTHREAD_PROCESS_SHAREDto permit a condition variableto be operated upon by any thread that has access to the memorywhere the condition variableis allocated, even if the condition variableis allocated in memory that is shared by multiple processes.If the<i>process-shared</i>attribute is PTHREAD_PROCESS_PRIVATE, the condition variablewill only be operated upon by threads createdwithin the same process as thethread that initialised the condition variable;if threads of differing processesattempt to operate on such a condition variable, the behaviour isundefined. The default value of the attribute isPTHREAD_PROCESS_PRIVATE.<p>Additional attributes, their default values, and the namesof the associated functions to get and set those attribute values areimplementation-dependent.</blockquote><h4><a name = "tag_000_007_1309"> </a>RETURN VALUE</h4><blockquote>If successful, the<i>pthread_condattr_setpshared()</i>function returns zero.Otherwise, an error number is returned to indicate the error.<p>If successful, the<i>pthread_condattr_getpshared()</i>function returns zeroand stores 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 error number is returned to indicate the error.</blockquote><h4><a name = "tag_000_007_1310"> </a>ERRORS</h4><blockquote>The<i>pthread_condattr_getpshared()</i>and<i>pthread_condattr_setpshared()</i>functions may fail if:<dl compact><dt>[EINVAL]<dd>The value specified by<i>attr</i>is invalid.</dl><p>The<i>pthread_condattr_setpshared()</i>function may fail if:<dl compact><dt>[EINVAL]<dd>The new value specified for the attributeis outside the range of legal values for that attribute.</dl><p>These functions will not return an error code of [EINTR].</blockquote><h4><a name = "tag_000_007_1311"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1312"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1313"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1314"> </a>SEE ALSO</h4><blockquote><i><a href="pthread_condattr_init.html">pthread_condattr_init()</a></i>,<i><a href="pthread_create.html">pthread_create()</a></i>,<i><a href="pthread_mutex_init.html">pthread_mutex_init()</a></i>,<i><a href="pthread_cond_init.html">pthread_cond_init()</a></i>,<i><a href="pthread.h.html"><pthread.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX Threads Extension (1003.1c-1995)</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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