158 lines
4.4 KiB
C
158 lines
4.4 KiB
C
/*
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* pthread_join.c
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*
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* Description:
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* This translation unit implements functions related to thread
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* synchronisation.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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/*
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* Not needed yet, but defining it should indicate clashes with build target
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* environment that should be fixed.
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*/
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#if !defined(WINCE)
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# include <signal.h>
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#endif
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int
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pthread_join (pthread_t thread, void **value_ptr)
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/*
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* ------------------------------------------------------
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* DOCPUBLIC
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* This function waits for 'thread' to terminate and
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* returns the thread's exit value if 'value_ptr' is not
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* NULL. This also detaches the thread on successful
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* completion.
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*
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* PARAMETERS
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* thread
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* an instance of pthread_t
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*
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* value_ptr
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* pointer to an instance of pointer to void
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*
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*
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* DESCRIPTION
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* This function waits for 'thread' to terminate and
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* returns the thread's exit value if 'value_ptr' is not
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* NULL. This also detaches the thread on successful
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* completion.
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* NOTE: detached threads cannot be joined or canceled
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*
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* RESULTS
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* 0 'thread' has completed
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* EINVAL thread is not a joinable thread,
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* ESRCH no thread could be found with ID 'thread',
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* ENOENT thread couldn't find it's own valid handle,
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* EDEADLK attempt to join thread with self
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*
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* ------------------------------------------------------
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*/
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{
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int result;
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pthread_t self;
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ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
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ptw32_mcs_local_node_t node;
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ptw32_mcs_lock_acquire(&ptw32_thread_reuse_lock, &node);
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if (NULL == tp
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|| thread.x != tp->ptHandle.x)
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{
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result = ESRCH;
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}
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else if (PTHREAD_CREATE_DETACHED == tp->detachState)
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{
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result = EINVAL;
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}
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else
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{
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result = 0;
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}
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ptw32_mcs_lock_release(&node);
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if (result == 0)
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{
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/*
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* The target thread is joinable and can't be reused before we join it.
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*/
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self = pthread_self();
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if (NULL == self.p)
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{
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result = ENOENT;
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}
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else if (pthread_equal (self, thread))
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{
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result = EDEADLK;
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}
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else
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{
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/*
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* Pthread_join is a cancelation point.
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* If we are canceled then our target thread must not be
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* detached (destroyed). This is guarranteed because
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* pthreadCancelableWait will not return if we
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* are canceled.
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*/
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result = pthreadCancelableWait (tp->threadH);
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if (0 == result)
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{
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if (value_ptr != NULL)
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{
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*value_ptr = tp->exitStatus;
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}
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/*
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* The result of making multiple simultaneous calls to
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* pthread_join() or pthread_detach() specifying the same
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* target is undefined.
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*/
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result = pthread_detach (thread);
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}
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else
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{
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result = ESRCH;
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}
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}
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}
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return (result);
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} /* pthread_join */
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