diff options
Diffstat (limited to 'lib/libpthread/thread/thr_detach.c')
| -rw-r--r-- | lib/libpthread/thread/thr_detach.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/lib/libpthread/thread/thr_detach.c b/lib/libpthread/thread/thr_detach.c new file mode 100644 index 0000000..0159e53 --- /dev/null +++ b/lib/libpthread/thread/thr_detach.c @@ -0,0 +1,117 @@ +/* + * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by John Birrell. + * 4. Neither the name of the author nor the names of any co-contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ +#include <sys/types.h> +#include <machine/atomic.h> +#include <errno.h> +#include <pthread.h> +#include "thr_private.h" + +__weak_reference(_pthread_detach, pthread_detach); + +int +_pthread_detach(pthread_t pthread) +{ + struct pthread *curthread = _get_curthread(); + struct kse_mailbox *kmbx = NULL; + struct pthread *joiner; + int rval = 0; + + /* Check for invalid calling parameters: */ + if (pthread == NULL || pthread->magic != THR_MAGIC) + /* Return an invalid argument error: */ + rval = EINVAL; + + else if ((rval = _thr_ref_add(curthread, pthread, + /*include dead*/1)) != 0) { + /* Return an error: */ + } + + /* Check if the thread is already detached: */ + else if ((pthread->attr.flags & PTHREAD_DETACHED) != 0) { + /* Return an error: */ + _thr_ref_delete(curthread, pthread); + rval = EINVAL; + } else { + /* Lock the detached thread: */ + THR_SCHED_LOCK(curthread, pthread); + + /* Flag the thread as detached: */ + pthread->attr.flags |= PTHREAD_DETACHED; + + /* Retrieve any joining thread and remove it: */ + joiner = pthread->joiner; + if ((joiner != NULL) && (joiner->kseg == pthread->kseg)) { + /* + * We already own the scheduler lock for the joiner. + * Take advantage of that and make the joiner runnable. + */ + if (joiner->join_status.thread == pthread) { + /* + * Set the return value for the woken thread: + */ + joiner->join_status.error = ESRCH; + joiner->join_status.ret = NULL; + joiner->join_status.thread = NULL; + + kmbx = _thr_setrunnable_unlocked(joiner); + } + joiner = NULL; + } + THR_SCHED_UNLOCK(curthread, pthread); + /* See if there is a thread waiting in pthread_join(): */ + if ((joiner != NULL) && + (_thr_ref_add(curthread, joiner, 0) == 0)) { + /* Lock the joiner before fiddling with it. */ + THR_SCHED_LOCK(curthread, joiner); + if (joiner->join_status.thread == pthread) { + /* + * Set the return value for the woken thread: + */ + joiner->join_status.error = ESRCH; + joiner->join_status.ret = NULL; + joiner->join_status.thread = NULL; + + kmbx = _thr_setrunnable_unlocked(joiner); + } + THR_SCHED_UNLOCK(curthread, joiner); + _thr_ref_delete(curthread, joiner); + } + _thr_ref_delete(curthread, pthread); + if (kmbx != NULL) + kse_wakeup(kmbx); + } + + /* Return the completion status: */ + return (rval); +} |
