6699b0c6fe
keep track of a joiner. POSIX only supports a single joiner, so this simplification is acceptable. At the same time, make sure to mark a joined thread as detached so that its resources can be freed. Reviewed by: deischen PR: 24345
89 lines
3.0 KiB
C
89 lines
3.0 KiB
C
/*
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* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <errno.h>
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#include <pthread.h>
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#include "pthread_private.h"
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__weak_reference(_pthread_detach, pthread_detach);
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int
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_pthread_detach(pthread_t pthread)
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{
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int rval = 0;
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/* Check for invalid calling parameters: */
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if (pthread == NULL || pthread->magic != PTHREAD_MAGIC)
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/* Return an invalid argument error: */
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rval = EINVAL;
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/* Check if the thread has not been detached: */
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else if ((pthread->attr.flags & PTHREAD_DETACHED) == 0) {
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/* Flag the thread as detached: */
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pthread->attr.flags |= PTHREAD_DETACHED;
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/*
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* Defer signals to protect the scheduling queues from
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* access by the signal handler:
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*/
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_thread_kern_sig_defer();
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/* Check if there is a joiner: */
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if (pthread->joiner != NULL) {
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struct pthread *joiner = pthread->joiner;
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/* Make the thread runnable: */
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PTHREAD_NEW_STATE(joiner, PS_RUNNING);
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/* Set the return value for the woken thread: */
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joiner->error = ESRCH;
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/*
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* Disconnect the joiner from the thread being detached:
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*/
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pthread->joiner = NULL;
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}
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/*
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* Undefer and handle pending signals, yielding if a
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* scheduling signal occurred while in the critical region.
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*/
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_thread_kern_sig_undefer();
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} else
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/* Return an error: */
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rval = EINVAL;
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/* Return the completion status: */
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return (rval);
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}
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