91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
/* ==== 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: pthread_detach.c,v 1.1 1994/02/07 22:04:24 proven Exp $ $provenid: pthread_detach.c,v 1.16 1994/02/07 02:19:16 proven Exp $";
|
|
#endif
|
|
|
|
#include <pthread.h>
|
|
|
|
/* ==========================================================================
|
|
* pthread_detach()
|
|
*/
|
|
int pthread_detach(pthread_t pthread)
|
|
{
|
|
semaphore *plock;
|
|
int ret;
|
|
|
|
plock = &(pthread->lock);
|
|
while (SEMAPHORE_TEST_AND_SET(plock)) {
|
|
pthread_yield();
|
|
}
|
|
|
|
/* Check that thread isn't detached already */
|
|
if (!(pthread->flags & PF_DETACHED)) {
|
|
|
|
pthread->flags |= PF_DETACHED;
|
|
|
|
/* Wakeup first threads waiting on a join */
|
|
{
|
|
struct pthread * next_thread;
|
|
semaphore * next_lock;
|
|
|
|
if (next_thread = pthread_queue_get(&(pthread->join_queue))) {
|
|
next_lock = &(next_thread->lock);
|
|
while (SEMAPHORE_TEST_AND_SET(next_lock)) {
|
|
pthread_yield();
|
|
}
|
|
pthread_queue_deq(&(pthread->join_queue));
|
|
next_thread->state = PS_RUNNING;
|
|
/*
|
|
* Thread will wake up in pthread_join(), see the thread
|
|
* it was joined to already detached and unlock itself
|
|
* and pthread
|
|
*/
|
|
} else {
|
|
SEMAPHORE_RESET(plock);
|
|
}
|
|
}
|
|
ret = OK;
|
|
|
|
} else {
|
|
SEMAPHORE_RESET(plock);
|
|
ret = ESRCH;
|
|
}
|
|
return(ret);
|
|
}
|