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/*
* pthread_join.c
*
* Description:
* This translation unit implements functions related to thread
* synchronisation.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2003 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
/*
* Not needed yet, but defining it should indicate clashes with build target
* environment that should be fixed.
*/
#include <signal.h>
int
pthread_join (pthread_t thread, void **value_ptr)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function waits for 'thread' to terminate and
* returns the thread's exit value if 'value_ptr' is not
* NULL. This also detaches the thread on successful
* completion.
*
* PARAMETERS
* thread
* an instance of pthread_t
*
* value_ptr
* pointer to an instance of pointer to void
*
*
* DESCRIPTION
* This function waits for 'thread' to terminate and
* returns the thread's exit value if 'value_ptr' is not
* NULL. This also detaches the thread on successful
* completion.
* NOTE: detached threads cannot be joined or canceled
*
* RESULTS
* 0 'thread' has completed
* EINVAL thread is not a joinable thread,
* ESRCH no thread could be found with ID 'thread',
* ENOENT thread couldn't find it's own valid handle,
* EDEADLK attempt to join thread with self
*
* ------------------------------------------------------
*/
{
int result;
pthread_t self;
/* This is the proper way to test for a valid thread ID */
result = pthread_kill (thread, 0);
if (0 != result)
{
return result;
}
self = pthread_self ();
if (NULL == self)
{
return ENOENT;
}
if (0 != pthread_equal (self, thread))
{
result = EDEADLK;
}
else if (PTHREAD_CREATE_DETACHED == thread->detachState)
{
result = EINVAL;
}
else
{
/*
* Pthread_join is a cancelation point.
* If we are canceled then our target thread must not be
* detached (destroyed). This is guarranteed because
* pthreadCancelableWait will not return if we
* are canceled.
*/
result = pthreadCancelableWait (thread->threadH);
if (result == 0)
{
#if ! defined (__MINGW32__) || defined (__MSVCRT__)
if (value_ptr != NULL
&& !GetExitCodeThread (thread->threadH, (LPDWORD) value_ptr))
{
result = ESRCH;
}
else
{
/*
* The result of making multiple simultaneous calls to
* pthread_join() specifying the same target is undefined.
*/
ptw32_threadDestroy (thread);
}
#else /* __MINGW32__ && ! __MSVCRT__ */
/*
* If using CRTDLL, the thread may have exited, and endthread
* will have closed the handle.
*/
if (value_ptr != NULL)
{
*value_ptr = thread->exitStatus;
}
/*
* The result of making multiple simultaneous calls to
* pthread_join() specifying the same target is undefined.
*/
ptw32_threadDestroy (thread);
#endif /* __MINGW32__ && ! __MSVCRT__ */
}
else
{
result = ESRCH;
}
}
return (result);
} /* pthread_join */
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