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119 lines
4.7 KiB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML>
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<HEAD>
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<META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=utf-8">
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<TITLE>PTHREAD_JOIN(3) manual page</TITLE>
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</HEAD>
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<BODY LANG="en-GB" BGCOLOR="#ffffff" DIR="LTR">
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<H4>POSIX Threads for Windows – REFERENCE - <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A></H4>
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<P><A HREF="index.html">Reference Index</A></P>
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<P><A HREF="#toc">Table of Contents</A></P>
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<H2><A HREF="#toc0" NAME="sect0">Name</A></H2>
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<P>pthread_join - wait for termination of another thread
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</P>
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<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
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<P><B>#include <pthread.h></B>
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</P>
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<P><B>int pthread_join(pthread_t </B><I>th</I><B>, void
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**</B><I>thread_return</I><B>);</B>
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</P>
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<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
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<P><B>pthread_join</B> suspends the execution of the calling thread
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until the thread identified by <I>th</I> terminates, either by
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calling <A HREF="pthread_exit.html"><B>pthread_exit</B>(3)</A> or by
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being cancelled.
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</P>
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<P>If <I>thread_return</I> is not <B>NULL</B>, the return value of <I>th</I>
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is stored in the location pointed to by <I>thread_return</I>. The
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return value of <I>th</I> is either the argument it gave to
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<A HREF="pthread_exit.html"><B>pthread_exit</B>(3)</A> , or
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<B>PTHREAD_CANCELED</B> if <I>th</I> was cancelled.
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</P>
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<P>The joined thread <B>th</B> must be in the joinable state: it must
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not have been detached using <A HREF="pthread_detach.html"><B>pthread_detach</B>(3)</A>
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or the <B>PTHREAD_CREATE_DETACHED</B> attribute to <A HREF="pthread_create.html"><B>pthread_create</B>(3)</A>
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.
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</P>
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<P>When a joinable thread terminates, its memory resources (thread
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descriptor and stack) are not deallocated until another thread
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performs <B>pthread_join</B> on it. Therefore, <B>pthread_join</B>
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must be called once for each joinable thread created to avoid memory
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leaks.
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</P>
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<P>At most one thread can wait for the termination of a given thread.
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Calling <B>pthread_join</B> on a thread <I>th</I> on which another
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thread is already waiting for termination returns an error.
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</P>
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<H2><A HREF="#toc3" NAME="sect3">Cancellation</A></H2>
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<P><B>pthread_join</B> is a cancellation point. If a thread is
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cancelled while suspended in <B>pthread_join</B>, the thread
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execution resumes immediately and the cancellation is executed
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without waiting for the <I>th</I> thread to terminate. If
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cancellation occurs during <B>pthread_join</B>, the <I>th</I> thread
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remains not joined.
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</P>
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<H2><A HREF="#toc4" NAME="sect4">Return Value</A></H2>
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<P>On success, the return value of <I>th</I> is stored in the
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location pointed to by <I>thread_return</I>, and 0 is returned. On
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error, a non-zero error code is returned.
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</P>
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<H2><A HREF="#toc5" NAME="sect5">Errors</A></H2>
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<DL>
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<DT><B>ESRCH</B>
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</DT><DD>
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No thread could be found corresponding to that specified by <I>th</I>.
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</DD><DT>
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<B>EINVAL</B>
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</DT><DD>
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The <I>th</I> thread has been detached.
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</DD><DT>
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<B>EINVAL</B>
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</DT><DD>
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Another thread is already waiting on termination of <I>th</I>.
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</DD><DT>
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<B>EDEADLK</B>
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</DT><DD STYLE="margin-bottom: 0.5cm">
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The <I>th</I> argument refers to the calling thread.
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</DD></DL>
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<H2>
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<A HREF="#toc6" NAME="sect6">Author</A></H2>
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<P>Xavier Leroy <Xavier.Leroy@inria.fr>
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</P>
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<H2><A HREF="#toc7" NAME="sect7">See Also</A></H2>
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<P><A HREF="pthread_exit.html"><B>pthread_exit</B>(3)</A> ,
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<A HREF="pthread_detach.html"><B>pthread_detach</B>(3)</A> ,
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<A HREF="pthread_create.html"><B>pthread_create</B>(3)</A> ,
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<A HREF="pthread_attr_setdetachstate.html"><B>pthread_attr_setdetachstate</B>(3)</A>
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, <A HREF="pthread_cleanup_push.html"><B>pthread_cleanup_push</B>(3)</A>
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, <A HREF="pthread_key_create.html"><B>pthread_key_create</B>(3)</A>
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.
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</P>
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<HR>
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<P><A NAME="toc"></A><B>Table of Contents</B></P>
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<UL>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect0" NAME="toc0">Name</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect1" NAME="toc1">Synopsis</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect2" NAME="toc2">Description</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect3" NAME="toc3">Cancellation</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect4" NAME="toc4">Return
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Value</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect5" NAME="toc5">Errors</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect6" NAME="toc6">Author</A>
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</P>
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<LI><P><A HREF="#sect7" NAME="toc7">See Also</A>
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</P>
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</UL>
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</BODY>
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</HTML>
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