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
137 lines
4.3 KiB
C
137 lines
4.3 KiB
C
/*
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* Copyright (c) 1995-1998 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 <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include "thr_private.h"
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void _pthread_exit(void *status);
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__weak_reference(_pthread_exit, pthread_exit);
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void
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_thread_exit(char *fname, int lineno, char *msg)
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{
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/* Write an error message to the standard error file descriptor: */
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_thread_printf(2,
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"Fatal error '%s' at line %d in file %s (errno = %d)\n",
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msg, lineno, fname, errno);
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abort();
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}
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/*
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* Only called when a thread is cancelled. It may be more useful
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* to call it from pthread_exit() if other ways of asynchronous or
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* abnormal thread termination can be found.
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*/
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void
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_thr_exit_cleanup(void)
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{
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struct pthread *curthread = _get_curthread();
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/*
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* POSIX states that cancellation/termination of a thread should
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* not release any visible resources (such as mutexes) and that
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* it is the applications responsibility. Resources that are
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* internal to the threads library, including file and fd locks,
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* are not visible to the application and need to be released.
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*/
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/* Unlock all private mutexes: */
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_mutex_unlock_private(curthread);
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/*
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* This still isn't quite correct because we don't account
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* for held spinlocks (see libc/stdlib/malloc.c).
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*/
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}
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void
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_pthread_exit(void *status)
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{
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struct pthread *curthread = _get_curthread();
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/* Check if this thread is already in the process of exiting: */
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if ((curthread->cancelflags & THR_CANCEL_EXITING) != 0) {
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char msg[128];
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snprintf(msg, sizeof(msg), "Thread %p has called "
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"pthread_exit() from a destructor. POSIX 1003.1 "
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"1996 s16.2.5.2 does not allow this!", curthread);
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PANIC(msg);
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}
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/* Flag this thread as exiting. */
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atomic_set_int(&curthread->cancelflags, THR_CANCEL_EXITING);
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_thr_exit_cleanup();
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/* Save the return value: */
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curthread->ret = status;
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while (curthread->cleanup != NULL) {
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pthread_cleanup_pop(1);
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}
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if (curthread->attr.cleanup_attr != NULL) {
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curthread->attr.cleanup_attr(curthread->attr.arg_attr);
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}
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/* Check if there is thread specific data: */
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if (curthread->specific != NULL) {
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/* Run the thread-specific data destructors: */
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_thread_cleanupspecific();
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}
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if (!_thr_isthreaded())
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exit(0);
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THREAD_LIST_LOCK(curthread);
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_thread_active_threads--;
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if (_thread_active_threads == 0) {
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THREAD_LIST_UNLOCK(curthread);
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exit(0);
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/* Never reach! */
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}
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if (curthread->tlflags & TLFLAGS_DETACHED)
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THR_GCLIST_ADD(curthread);
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curthread->state = PS_DEAD;
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THREAD_LIST_UNLOCK(curthread);
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if (curthread->joiner)
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_thr_umtx_wake(&curthread->state, INT_MAX);
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thr_exit(&curthread->terminated);
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PANIC("thr_exit() returned");
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/* Never reach! */
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}
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