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freebsd/lib/libthr/thread/thr_detach.c
Mike Makonnen 8c223652fb o If a thread is marked as detached AND on the dead threads list
the correct return value is ESRCH.
o Don't check the attribute for NULL. It's the caller's responsibility.
o Make the bitwise comparison explicit.
2004-03-29 13:51:51 +00:00

80 lines
2.7 KiB
C

/*
* 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 <errno.h>
#include <pthread.h>
#include <stdlib.h>
#include "thr_private.h"
__weak_reference(_pthread_detach, pthread_detach);
int
_pthread_detach(pthread_t pthread)
{
if (pthread->magic != PTHREAD_MAGIC)
return (EINVAL);
UMTX_LOCK(&pthread->lock);
if ((pthread->attr.flags & PTHREAD_DETACHED) != 0) {
UMTX_UNLOCK(&pthread->lock);
return ((pthread->state == PS_DEAD) ? ESRCH : EINVAL);
}
pthread->attr.flags |= PTHREAD_DETACHED;
/* Check if there is a joiner: */
if (pthread->joiner != NULL) {
struct pthread *joiner = pthread->joiner;
_thread_critical_enter(joiner);
/* Make the thread runnable: */
PTHREAD_NEW_STATE(joiner, PS_RUNNING);
/* Set the return value for the woken thread: */
joiner->join_status.error = ESRCH;
joiner->join_status.ret = NULL;
joiner->join_status.thread = NULL;
/*
* Disconnect the joiner from the thread being detached:
*/
pthread->joiner = NULL;
_thread_critical_exit(joiner);
}
UMTX_UNLOCK(&pthread->lock);
return (0);
}