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+	<TITLE>PTHREAD_ATTR_INIT(3) manual page</TITLE>
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+<H4>POSIX Threads for Windows – REFERENCE - <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A></H4>
+<P><A HREF="index.html">Reference Index</A></P>
+<P><A HREF="#toc">Table of Contents</A></P>
+<H2><A HREF="#toc0" NAME="sect0">Name</A></H2>
+<P>pthread_attr_init, pthread_attr_destroy,
+pthread_attr_setdetachstate, pthread_attr_getdetachstate,
+pthread_attr_setschedparam, pthread_attr_getschedparam,
+pthread_attr_setschedpolicy, pthread_attr_getschedpolicy,
+pthread_attr_setinheritsched, pthread_attr_getinheritsched,
+pthread_attr_setscope, pthread_attr_getscope - thread creation
+attributes 
+</P>
+<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
+<P><B>#include &lt;pthread.h&gt;</B> 
+</P>
+<P><B>int pthread_attr_init(pthread_attr_t *</B><I>attr</I><B>);</B> 
+</P>
+<P><B>int pthread_attr_destroy(pthread_attr_t *</B><I>attr</I><B>);</B>
+</P>
+<P><B>int pthread_attr_setdetachstate(pthread_attr_t *</B><I>attr</I><B>,
+int </B><I>detachstate</I><B>);</B> 
+</P>
+<P><B>int pthread_attr_getdetachstate(const pthread_attr_t *</B><I>attr</I><B>,
+int *</B><I>detachstate</I><B>);</B> 
+</P>
+<P><B>int pthread_attr_setschedpolicy(pthread_attr_t *</B><I>attr</I><B>,
+int </B><I>policy</I><B>);</B> 
+</P>
+<P><B>int pthread_attr_getschedpolicy(const pthread_attr_t *</B><I>attr</I><B>,
+int *</B><I>policy</I><B>);</B> 
+</P>
+<P><B>int pthread_attr_setschedparam(pthread_attr_t *</B><I>attr</I><B>,
+const struct sched_param *</B><I>param</I><B>);</B> 
+</P>
+<P><B>int pthread_attr_getschedparam(const pthread_attr_t *</B><I>attr</I><B>,
+struct sched_param *</B><I>param</I><B>);</B> 
+</P>
+<P><B>int pthread_attr_setinheritsched(pthread_attr_t *</B><I>attr</I><B>,
+int </B><I>inherit</I><B>);</B> 
+</P>
+<P><B>int pthread_attr_getinheritsched(const pthread_attr_t *</B><I>attr</I><B>,
+int *</B><I>inherit</I><B>);</B> 
+</P>
+<P><B>int pthread_attr_setscope(pthread_attr_t *</B><I>attr</I><B>,
+int </B><I>scope</I><B>);</B> 
+</P>
+<P><B>int pthread_attr_getscope(const pthread_attr_t *</B><I>attr</I><B>,
+int *</B><I>scope</I><B>);</B> 
+</P>
+<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
+<P>Setting attributes for threads is achieved by filling a thread
+attribute object <I>attr</I> of type <B>pthread_attr_t</B>, then
+passing it as second argument to <A HREF="pthread_create.html"><B>pthread_create</B>(3)</A>
+. Passing <B>NULL</B> is equivalent to passing a thread attribute
+object with all attributes set to their default values. 
+</P>
+<P><B>pthread_attr_init</B> initializes the thread attribute object
+<I>attr</I> and fills it with default values for the attributes. (The
+default values are listed below for each attribute.) 
+</P>
+<P>Each attribute <I>attrname</I> (see below for a list of all
+attributes) can be individually set using the function
+<B>pthread_attr_set</B><I>attrname</I> and retrieved using the
+function <B>pthread_attr_get</B><I>attrname.</I> 
+</P>
+<P><B>pthread_attr_destroy</B> destroys a thread attribute object,
+which must not then be reused until it is reinitialized. 
+</P>
+<P>Attribute objects are consulted only when creating a new thread.
+The same attribute object can be used for creating several threads.
+Modifying an attribute object after a call to <B>pthread_create</B>
+does not change the attributes of the thread previously created. 
+</P>
+<P>The following thread attributes are supported: 
+</P>
+<H3><A HREF="#toc3" NAME="sect3">detachstate</A></H3>
+<P>Control whether the thread is created in the joinable state (value
+<B>PTHREAD_CREATE_JOINABLE</B>) or in the detached state (
+<B>PTHREAD_CREATE_DETACHED</B>). 
+</P>
+<P>Default value: <B>PTHREAD_CREATE_JOINABLE</B>. 
+</P>
+<P>In the joinable state, another thread can synchronize on the
+thread termination and recover its termination code using
+<A HREF="pthread_join.html"><B>pthread_join</B>(3)</A> . When a
+joinable thread terminates, some of the thread resources are kept
+allocated, and released only when another thread performs
+<A HREF="pthread_join.html"><B>pthread_join</B>(3)</A> on that
+thread. 
+</P>
+<P>In the detached state, the thread's resources are released
+immediately when it terminates. <A HREF="pthread_join.html"><B>pthread_join</B>(3)</A>
+cannot be used to synchronize on the thread termination. 
+</P>
+<P>A thread created in the joinable state can later be put in the
+detached thread using <A HREF="pthread_detach.html"><B>pthread_detach</B>(3)</A>
+. 
+</P>
+<H3><A HREF="#toc4" NAME="sect4">schedpolicy</A></H3>
+<P>Select the scheduling policy for the thread: one of <B>SCHED_OTHER</B>
+(regular, non-real-time scheduling), <B>SCHED_RR</B> (real-time,
+round-robin) or <B>SCHED_FIFO</B> (real-time, first-in first-out). 
+</P>
+<P><B>Pthreads-w32</B> only supports <B>SCHED_OTHER</B> - attempting
+to set one of the other policies will return an error ENOTSUP.</P>
+<P>Default value: <B>SCHED_OTHER</B>. 
+</P>
+<P><B>Pthreads-w32</B> only supports <B>SCHED_OTHER</B> - attempting
+to set one of the other policies will return an error ENOTSUP.</P>
+<P>The scheduling policy of a thread can be changed after creation
+with <A HREF="pthread_setschedparam.html"><B>pthread_setschedparam</B>(3)</A>
+. 
+</P>
+<H3><A HREF="#toc5" NAME="sect5">schedparam</A></H3>
+<P>Contain the scheduling parameters (essentially, the scheduling
+priority) for the thread.</P>
+<P><B>Pthreads-w32</B> supports the priority levels defined by the
+Windows system it is running on. Under Windows, thread priorities are
+relative to the process priority class, which must be set via the
+Windows W32 API.</P>
+<P>Default value: priority is 0 (Win32 level <B>THREAD_PRIORITY_NORMAL</B>).
+</P>
+<P>The scheduling priority of a thread can be changed after creation
+with <A HREF="pthread_setschedparam.html"><B>pthread_setschedparam</B>(3)</A>
+. 
+</P>
+<H3><A HREF="#toc6" NAME="sect6">inheritsched</A></H3>
+<P>Indicate whether the scheduling policy and scheduling parameters
+for the newly created thread are determined by the values of the
+<I>schedpolicy</I> and <I>schedparam</I> attributes (value
+<B>PTHREAD_EXPLICIT_SCHED</B>) or are inherited from the parent
+thread (value <B>PTHREAD_INHERIT_SCHED</B>). 
+</P>
+<P>Default value: <B>PTHREAD_EXPLICIT_SCHED</B>. 
+</P>
+<H3><A HREF="#toc7" NAME="sect7">scope</A></H3>
+<P>Define the scheduling contention scope for the created thread. The
+only value supported in the <B>Pthreads-w32</B> implementation is
+<B>PTHREAD_SCOPE_SYSTEM</B>, meaning that the threads contend for CPU
+time with all processes running on the machine. The other value
+specified by the standard, <B>PTHREAD_SCOPE_PROCESS</B>, means that
+scheduling contention occurs only between the threads of the running
+process.</P>
+<P><B>Pthreads-w32</B> only supports <B>PTHREAD_SCOPE_SYSTEM</B>.</P>
+<P>Default value: <B>PTHREAD_SCOPE_SYSTEM</B>. 
+</P>
+<H2><A HREF="#toc8" NAME="sect8">Return Value</A></H2>
+<P>All functions return 0 on success and a non-zero error code on
+error. On success, the <B>pthread_attr_get</B><I>attrname</I>
+functions also store the current value of the attribute <I>attrname</I>
+in the location pointed to by their second argument. 
+</P>
+<H2><A HREF="#toc9" NAME="sect9">Errors</A></H2>
+<P>The <B>pthread_attr_setdetachstate</B> function returns the
+following error codes on error: 
+</P>
+<DL>
+	<DL>
+		<DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>EINVAL</B> 
+		</DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
+		the specified <I>detachstate</I> is not one of
+		<B>PTHREAD_CREATE_JOINABLE</B> or <B>PTHREAD_CREATE_DETACHED</B>. 
+		</DD></DL>
+</DL>
+<P>
+The <B>pthread_attr_setschedparam</B> function returns the following
+error codes on error: 
+</P>
+<DL>
+	<DL>
+		<DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>EINVAL</B> 
+		</DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
+		the priority specified in <I>param</I> is outside the range of
+		allowed priorities for the scheduling policy currently in <I>attr</I>
+		(1 to 99 for <B>SCHED_FIFO</B> and <B>SCHED_RR</B>; 0 for
+		<B>SCHED_OTHER</B>). 
+		</DD></DL>
+</DL>
+<P>
+The <B>pthread_attr_setschedpolicy</B> function returns the following
+error codes on error: 
+</P>
+<DL>
+	<DL>
+		<DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>EINVAL</B> 
+		</DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
+		the specified <I>policy</I> is not one of <B>SCHED_OTHER</B>,
+		<B>SCHED_FIFO</B>, or <B>SCHED_RR</B>. 
+		</DD><DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
+		<B>ENOTSUP</B> 
+		</DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
+		<I>policy</I> is not <B>SCHED_OTHER</B>, the only value supported
+		by <B>Pthreads-w32</B>.</DD></DL>
+</DL>
+<P>
+The <B>pthread_attr_setinheritsched</B> function returns the
+following error codes on error: 
+</P>
+<DL>
+	<DL>
+		<DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>EINVAL</B> 
+		</DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
+		the specified <I>inherit</I> is not one of <B>PTHREAD_INHERIT_SCHED</B>
+		or <B>PTHREAD_EXPLICIT_SCHED</B>. 
+		</DD></DL>
+</DL>
+<P>
+The <B>pthread_attr_setscope</B> function returns the following error
+codes on error: 
+</P>
+<DL>
+	<DL>
+		<DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>EINVAL</B> 
+		</DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
+		the specified <I>scope</I> is not one of <B>PTHREAD_SCOPE_SYSTEM</B>
+		or <B>PTHREAD_SCOPE_PROCESS</B>. 
+		</DD><DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
+		<B>ENOTSUP</B> 
+		</DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
+		the specified <I>scope</I> is <B>PTHREAD_SCOPE_PROCESS</B> (not
+		supported by <B>Pthreads-w32</B>). 
+		</DD></DL>
+</DL>
+<H2>
+<A HREF="#toc10" NAME="sect10">Author</A></H2>
+<P>Xavier Leroy &lt;Xavier.Leroy@inria.fr&gt; 
+</P>
+<P>Modified by Ross Johnson for use with <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A>.</P>
+<H2><A HREF="#toc11" NAME="sect11">See Also</A></H2>
+<P><A HREF="pthread_create.html"><B>pthread_create</B>(3)</A> ,
+<A HREF="pthread_join.html"><B>pthread_join</B>(3)</A> ,
+<A HREF="pthread_detach.html"><B>pthread_detach</B>(3)</A> ,
+<A HREF="pthread_setschedparam.html"><B>pthread_setschedparam</B>(3)</A>
+. 
+</P>
+<HR>
+<P><A NAME="toc"></A><B>Table of Contents</B></P>
+<UL>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect0" NAME="toc0">Name</A>
+		</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect1" NAME="toc1">Synopsis</A>
+		</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect2" NAME="toc2">Description</A>
+		</P>
+	<UL>
+		<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect3" NAME="toc3">detachstate</A>
+				</P>
+		<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect4" NAME="toc4">schedpolicy</A>
+				</P>
+		<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect5" NAME="toc5">schedparam</A>
+				</P>
+		<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect6" NAME="toc6">inheritsched</A>
+				</P>
+		<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect7" NAME="toc7">scope</A>
+				</P>
+	</UL>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect8" NAME="toc8">Return
+	Value</A> 
+	</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect9" NAME="toc9">Errors</A>
+		</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect10" NAME="toc10">Author</A>
+		</P>
+	<LI><P><A HREF="#sect11" NAME="toc11">See Also</A> 
+	</P>
+</UL>
+</BODY>
+</HTML>