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/*
* pthread_join.c
*
* Description:
* This translation unit implements functions related to thread
* synchronisation.
*
* --------------------------------------------------------------------------
*
* Pthreads4w - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999-2018, Pthreads4w contributors
*
* Homepage: https://sourceforge.net/projects/pthreads4w/
*
* 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:
* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
*
* This file is part of Pthreads4w.
*
* Pthreads4w is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pthreads4w 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. *
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "pthread.h"
#include "implement.h"
/*
* Not needed yet, but defining it should indicate clashes with build target
* environment that should be fixed.
*/
#if !defined(WINCE)
# include <signal.h>
#endif
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;
ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&ptw32_thread_reuse_lock, &node);
if (NULL == tp
|| thread.x != tp->ptHandle.x)
{
result = ESRCH;
}
else if (PTHREAD_CREATE_DETACHED == tp->detachState)
{
result = EINVAL;
}
else
{
result = 0;
}
ptw32_mcs_lock_release(&node);
if (result == 0)
{
/*
* The target thread is joinable and can't be reused before we join it.
*/
self = pthread_self();
if (NULL == self.p)
{
result = ENOENT;
}
else if (pthread_equal (self, thread))
{
result = EDEADLK;
}
else
{
/*
* Pthread_join is a cancellation point.
* If we are canceled then our target thread must not be
* detached (destroyed). This is guaranteed because
* pthreadCancelableWait will not return if we
* are canceled.
*/
result = pthreadCancelableWait (tp->threadH);
if (0 == result)
{
if (value_ptr != NULL)
{
*value_ptr = tp->exitStatus;
}
/*
* The result of making multiple simultaneous calls to
* pthread_join() or pthread_detach() specifying the same
* target is undefined.
*/
result = pthread_detach (thread);
}
else
{
result = ESRCH;
}
}
}
return (result);
} /* pthread_join */
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