a091d823ad
1. fast simple type mutex.
2. __thread tls works.
3. asynchronous cancellation works ( using signal ).
4. thread synchronization is fully based on umtx, mainly, condition
variable and other synchronization objects were rewritten by using
umtx directly. those objects can be shared between processes via
shared memory, it has to change ABI which does not happen yet.
5. default stack size is increased to 1M on 32 bits platform, 2M for
64 bits platform.
As the result, some mysql super-smack benchmarks show performance is
improved massivly.
Okayed by: jeff, mtm, rwatson, scottl
164 lines
4.3 KiB
C
164 lines
4.3 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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* $FreeBSD$
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*
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*/
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#include <pthread.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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int _pthread_setcanceltype(int type, int *oldtype);
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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 oldval, newval = 0;
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int oldtype;
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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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* so we temporarily disable async cancellation.
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*/
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_pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, &oldtype);
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if ((ret = _thr_ref_add(curthread, pthread, 0)) != 0) {
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_pthread_setcanceltype(oldtype, NULL);
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return (ret);
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}
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do {
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oldval = pthread->cancelflags;
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if (oldval & THR_CANCEL_NEEDED)
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break;
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newval = oldval | THR_CANCEL_NEEDED;
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} while (!atomic_cmpset_acq_int(&pthread->cancelflags, oldval, newval));
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if (!(oldval & THR_CANCEL_NEEDED) && SHOULD_ASYNC_CANCEL(newval))
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_thr_send_sig(pthread, SIGCANCEL);
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_thr_ref_delete(curthread, pthread);
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_pthread_setcanceltype(oldtype, NULL);
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return (0);
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}
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static inline void
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testcancel(struct pthread *curthread)
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{
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int newval;
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newval = curthread->cancelflags;
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if (SHOULD_CANCEL(newval))
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pthread_exit(PTHREAD_CANCELED);
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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, ret;
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oldval = curthread->cancelflags;
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if (oldstate != NULL)
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*oldstate = ((oldval & THR_CANCEL_DISABLE) ?
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PTHREAD_CANCEL_DISABLE : PTHREAD_CANCEL_ENABLE);
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switch (state) {
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case PTHREAD_CANCEL_DISABLE:
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atomic_set_int(&curthread->cancelflags, THR_CANCEL_DISABLE);
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ret = 0;
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break;
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case PTHREAD_CANCEL_ENABLE:
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atomic_clear_int(&curthread->cancelflags, THR_CANCEL_DISABLE);
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testcancel(curthread);
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ret = 0;
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break;
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default:
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ret = EINVAL;
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}
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return (ret);
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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, ret;
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oldval = curthread->cancelflags;
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if (oldtype != NULL)
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*oldtype = ((oldval & THR_CANCEL_AT_POINT) ?
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PTHREAD_CANCEL_ASYNCHRONOUS :
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PTHREAD_CANCEL_DEFERRED);
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switch (type) {
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case PTHREAD_CANCEL_ASYNCHRONOUS:
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atomic_set_int(&curthread->cancelflags, THR_CANCEL_AT_POINT);
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testcancel(curthread);
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ret = 0;
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break;
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case PTHREAD_CANCEL_DEFERRED:
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atomic_clear_int(&curthread->cancelflags, THR_CANCEL_AT_POINT);
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ret = 0;
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break;
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default:
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ret = EINVAL;
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}
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return (ret);
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}
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void
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_pthread_testcancel(void)
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{
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testcancel(_get_curthread());
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}
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int
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_thr_cancel_enter(struct pthread *curthread)
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{
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int oldval;
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oldval = curthread->cancelflags;
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if (!(oldval & THR_CANCEL_AT_POINT)) {
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atomic_set_int(&curthread->cancelflags, THR_CANCEL_AT_POINT);
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testcancel(curthread);
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}
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return (oldval);
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}
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void
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_thr_cancel_leave(struct pthread *curthread, int previous)
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{
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if (!(previous & THR_CANCEL_AT_POINT))
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atomic_clear_int(&curthread->cancelflags, THR_CANCEL_AT_POINT);
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}
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