150 lines
4.1 KiB
C
150 lines
4.1 KiB
C
/*
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* Copyright (c) 2005, David Xu <davidxu@freebsd.org>
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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 unmodified, this list of conditions, and the following
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <errno.h>
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#include <pthread.h>
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#include "un-namespace.h"
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#include "thr_private.h"
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int _pthread_timedjoin_np(pthread_t pthread, void **thread_return,
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const struct timespec *abstime);
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static int join_common(pthread_t, void **, const struct timespec *);
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__weak_reference(_pthread_join, pthread_join);
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__weak_reference(_pthread_timedjoin_np, pthread_timedjoin_np);
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static void backout_join(void *arg)
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{
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struct pthread *pthread = (struct pthread *)arg;
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struct pthread *curthread = _get_curthread();
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THR_THREAD_LOCK(curthread, pthread);
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pthread->joiner = NULL;
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THR_THREAD_UNLOCK(curthread, pthread);
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}
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int
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_pthread_join(pthread_t pthread, void **thread_return)
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{
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return (join_common(pthread, thread_return, NULL));
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}
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int
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_pthread_timedjoin_np(pthread_t pthread, void **thread_return,
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const struct timespec *abstime)
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{
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if (abstime == NULL || abstime->tv_sec < 0 || abstime->tv_nsec < 0 ||
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abstime->tv_nsec >= 1000000000)
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return (EINVAL);
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return (join_common(pthread, thread_return, abstime));
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}
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/*
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* Cancellation behavior:
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* if the thread is canceled, joinee is not recycled.
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*/
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static int
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join_common(pthread_t pthread, void **thread_return,
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const struct timespec *abstime)
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{
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struct pthread *curthread = _get_curthread();
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struct timespec ts, ts2, *tsp;
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void *tmp;
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long tid;
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int ret = 0;
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if (pthread == NULL)
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return (EINVAL);
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if (pthread == curthread)
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return (EDEADLK);
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if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0)
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return (ESRCH);
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if ((pthread->flags & THR_FLAGS_DETACHED) != 0) {
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ret = EINVAL;
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} else if (pthread->joiner != NULL) {
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/* Multiple joiners are not supported. */
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ret = ENOTSUP;
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}
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if (ret) {
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THR_THREAD_UNLOCK(curthread, pthread);
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return (ret);
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}
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/* Set the running thread to be the joiner: */
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pthread->joiner = curthread;
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THR_THREAD_UNLOCK(curthread, pthread);
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THR_CLEANUP_PUSH(curthread, backout_join, pthread);
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_thr_cancel_enter(curthread);
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tid = pthread->tid;
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while (pthread->tid != TID_TERMINATED) {
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_thr_testcancel(curthread);
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if (abstime != NULL) {
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clock_gettime(CLOCK_REALTIME, &ts);
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TIMESPEC_SUB(&ts2, abstime, &ts);
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if (ts2.tv_sec < 0) {
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ret = ETIMEDOUT;
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break;
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}
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tsp = &ts2;
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} else
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tsp = NULL;
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ret = _thr_umtx_wait(&pthread->tid, tid, tsp);
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if (ret == ETIMEDOUT)
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break;
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}
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_thr_cancel_leave(curthread, 0);
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THR_CLEANUP_POP(curthread, 0);
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if (ret == ETIMEDOUT) {
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THR_THREAD_LOCK(curthread, pthread);
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pthread->joiner = NULL;
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THR_THREAD_UNLOCK(curthread, pthread);
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} else {
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ret = 0;
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tmp = pthread->ret;
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THR_THREAD_LOCK(curthread, pthread);
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pthread->flags |= THR_FLAGS_DETACHED;
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pthread->joiner = NULL;
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_thr_try_gc(curthread, pthread); /* thread lock released */
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if (thread_return != NULL)
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*thread_return = tmp;
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}
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return (ret);
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}
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