8d2a2db80c
the cause of any bugs because it is *always* indirectly set in the for...loop, but better to be explicit about it. o Check the magic number of the passed in thread only after it has been found in the active thread list. Otherwise, if the check is done at the very beginning we may end up pointing to garbage if the thread was once a valid thread, but has now been destroyed.
63 lines
2.3 KiB
C
63 lines
2.3 KiB
C
/*
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* Copyright (c) 1998 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 "thr_private.h"
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/* Find a thread in the linked list of active threads: */
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int
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_find_thread(pthread_t pthread)
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{
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pthread_t pthread1;
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if (pthread == NULL)
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return(EINVAL);
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THREAD_LIST_LOCK;
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/* Search for the specified thread: */
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pthread1 = NULL;
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TAILQ_FOREACH(pthread1, &_thread_list, tle) {
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if (pthread == pthread1)
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break;
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}
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THREAD_LIST_UNLOCK;
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if (pthread1 != NULL && pthread1->magic != PTHREAD_MAGIC)
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return (EINVAL);
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/* Return zero if the thread exists: */
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return ((pthread1 != NULL) ? 0:ESRCH);
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}
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