178 lines
4.4 KiB
C
178 lines
4.4 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 <pthread.h>
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#include "un-namespace.h"
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#include "thr_private.h"
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__weak_reference(_pthread_cancel, pthread_cancel);
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__weak_reference(_pthread_setcancelstate, pthread_setcancelstate);
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__weak_reference(_pthread_setcanceltype, pthread_setcanceltype);
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__weak_reference(_pthread_testcancel, pthread_testcancel);
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static inline void
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testcancel(struct pthread *curthread)
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{
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if (__predict_false(SHOULD_CANCEL(curthread) &&
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!THR_IN_CRITICAL(curthread)))
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_pthread_exit(PTHREAD_CANCELED);
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}
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void
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_thr_testcancel(struct pthread *curthread)
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{
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testcancel(curthread);
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}
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int
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_pthread_cancel(pthread_t pthread)
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{
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struct pthread *curthread = _get_curthread();
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int ret;
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/*
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* POSIX says _pthread_cancel should be async cancellation safe.
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* _thr_find_thread and THR_THREAD_UNLOCK will enter and leave critical
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* region automatically.
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*/
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if ((ret = _thr_find_thread(curthread, pthread, 0)) == 0) {
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if (!pthread->cancel_pending) {
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pthread->cancel_pending = 1;
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if (pthread->state != PS_DEAD)
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_thr_send_sig(pthread, SIGCANCEL);
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}
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THR_THREAD_UNLOCK(curthread, pthread);
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}
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return (ret);
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}
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int
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_pthread_setcancelstate(int state, int *oldstate)
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{
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struct pthread *curthread = _get_curthread();
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int oldval;
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oldval = curthread->cancel_enable;
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switch (state) {
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case PTHREAD_CANCEL_DISABLE:
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curthread->cancel_enable = 0;
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break;
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case PTHREAD_CANCEL_ENABLE:
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curthread->cancel_enable = 1;
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if (curthread->cancel_async)
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testcancel(curthread);
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break;
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default:
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return (EINVAL);
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}
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if (oldstate) {
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*oldstate = oldval ? PTHREAD_CANCEL_ENABLE :
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PTHREAD_CANCEL_DISABLE;
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}
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return (0);
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}
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int
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_pthread_setcanceltype(int type, int *oldtype)
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{
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struct pthread *curthread = _get_curthread();
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int oldval;
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oldval = curthread->cancel_async;
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switch (type) {
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case PTHREAD_CANCEL_ASYNCHRONOUS:
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curthread->cancel_async = 1;
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testcancel(curthread);
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break;
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case PTHREAD_CANCEL_DEFERRED:
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curthread->cancel_async = 0;
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break;
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default:
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return (EINVAL);
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}
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if (oldtype) {
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*oldtype = oldval ? PTHREAD_CANCEL_ASYNCHRONOUS :
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PTHREAD_CANCEL_DEFERRED;
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}
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return (0);
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}
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void
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_pthread_testcancel(void)
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{
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struct pthread *curthread = _get_curthread();
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testcancel(curthread);
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}
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void
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_thr_cancel_enter(struct pthread *curthread)
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{
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curthread->cancel_point = 1;
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testcancel(curthread);
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}
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void
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_thr_cancel_enter2(struct pthread *curthread, int maycancel)
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{
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curthread->cancel_point = 1;
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if (__predict_false(SHOULD_CANCEL(curthread) &&
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!THR_IN_CRITICAL(curthread))) {
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if (!maycancel)
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thr_wake(curthread->tid);
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else
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_pthread_exit(PTHREAD_CANCELED);
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}
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}
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void
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_thr_cancel_leave(struct pthread *curthread, int maycancel)
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{
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curthread->cancel_point = 0;
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if (__predict_false(SHOULD_CANCEL(curthread) &&
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!THR_IN_CRITICAL(curthread) && maycancel))
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_pthread_exit(PTHREAD_CANCELED);
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}
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void
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_pthread_cancel_enter(int maycancel)
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{
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_thr_cancel_enter2(_get_curthread(), maycancel);
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}
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void
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_pthread_cancel_leave(int maycancel)
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{
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_thr_cancel_leave(_get_curthread(), maycancel);
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}
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