pthread_detach.c
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上传日期:2007-04-14
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- /* ==== pthread_detach.c =======================================================
- * Copyright (c) 1994 by Chris Provenzano, proven@mit.edu
- * 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 Chris Provenzano.
- * 4. The name of Chris Provenzano may not be used to endorse or promote
- * products derived from this software without specific prior written
- * permission.
- *
- * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``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 CHRIS PROVENZANO 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.
- *
- * Description : pthread_join function.
- *
- * 1.00 94/01/15 proven
- * -Started coding this file.
- */
- #ifndef lint
- static const char rcsid[] = "$Id$";
- #endif
- #include <errno.h>
- #include <pthread.h>
- /* ==========================================================================
- * pthread_detach()
- */
- int pthread_detach(pthread_t pthread)
- {
- struct pthread * next_thread, * high_thread, * low_thread;
- int ret;
- pthread_sched_prevent();
- /* Check that thread isn't detached already */
- if (!(pthread->attr.flags & PTHREAD_DETACHED)) {
- pthread->attr.flags |= PTHREAD_DETACHED;
- /* Wakeup all threads waiting on a join */
- if (next_thread = pthread_queue_deq(&(pthread->join_queue))) {
- high_thread = next_thread;
-
- while (next_thread = pthread_queue_deq(&(pthread->join_queue))) {
- if (high_thread->pthread_priority < next_thread->pthread_priority) {
- low_thread = high_thread;
- high_thread = next_thread;
- } else {
- low_thread = next_thread;
- }
- pthread_prio_queue_enq(pthread_current_prio_queue, low_thread);
- low_thread->state = PS_RUNNING;
- }
- /* If the thread is dead then move it to the alloc queue */
- if (pthread_queue_remove(&pthread_dead_queue, pthread) == OK) {
- pthread_queue_enq(&pthread_alloc_queue, pthread);
- }
- pthread_sched_other_resume(high_thread);
- return(OK);
- }
- /* If the thread is dead then move it to the alloc queue */
- if (pthread_queue_remove(&pthread_dead_queue, pthread) == OK) {
- pthread_queue_enq(&pthread_alloc_queue, pthread);
- pthread->state = PS_UNALLOCED;
- }
- ret = OK;
- } else {
- ret = ESRCH;
- }
- pthread_sched_resume();
- return(ret);
- }