0ab1bfc7b2
In some corner cases of static linking and unexpected libraries order on the linker command line, libc symbol might preempt the same libthr symbol, in which case libthr jump table points back to libc causing either infinite recursion or loop. Handle all of such symbols by using private libthr names for them, ensuring that the right pointers are installed into the table. In collaboration with: arichardson PR: 239475 Tested by: pho MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D21088
153 lines
4.2 KiB
C
153 lines
4.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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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(_thr_join, pthread_join);
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__weak_reference(_thr_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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_thr_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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