| /* |
| * 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) 1999,2005 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. |
| */ |
| #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 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 (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 */ |