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Diffstat (limited to 'libs/pthreads/src/pthread_join.c')
| -rw-r--r-- | libs/pthreads/src/pthread_join.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/libs/pthreads/src/pthread_join.c b/libs/pthreads/src/pthread_join.c new file mode 100644 index 0000000000..c2b7c1e757 --- /dev/null +++ b/libs/pthreads/src/pthread_join.c @@ -0,0 +1,157 @@ +/* + * 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 */ |