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97dac76c11
1998-11-18 Ulrich Drepper <drepper@cygnus.com> * Makefile (CFLAGS-mutex.c): Define as -D__NO_WEAK_PTHREAD_ALIASES. (CFLAGS-specific.c): Likewise. (CFLAGS-pthread.c): Likewise. (CFLAGS-ptfork.c): Likewise. (CFLAGS-cancel.c): Likewise. * sysdeps/pthread/bits/libc-lock.h: Don't mark __pthread_* functions as weak references if __NO_WEAK_PTHREAD_ALIASES is defined. * mutex.c (pthread_mutex_init): Define as strong symbol. (pthread_mutex_destroy): Likewise. (pthread_mutex_trylock): Likewise. (pthread_mutex_lock): Likewise. (pthread_mutex_unlock): Likewise. (pthread_mutexattr_init): Likewise. (pthread_mutexattr_destroy): Likewise. (pthread_once): Likewise. * ptfork.c (pthread_atfork): Likewise. * specific.c (pthread_key_create): Likewise. (pthread_setspecific): Likewise. (pthread_getspecific): Likewise.
200 lines
6.0 KiB
C
200 lines
6.0 KiB
C
/* Linuxthreads - a simple clone()-based implementation of Posix */
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/* threads for Linux. */
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/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */
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/* */
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/* This program is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU Library General Public License */
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/* as published by the Free Software Foundation; either version 2 */
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/* of the License, or (at your option) any later version. */
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/* */
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/* This program is distributed in the hope that it will be useful, */
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/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
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/* GNU Library General Public License for more details. */
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/* Mutexes */
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#include <errno.h>
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#include <sched.h>
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#include <stddef.h>
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#include "pthread.h"
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#include "internals.h"
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#include "spinlock.h"
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#include "queue.h"
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#include "restart.h"
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int __pthread_mutex_init(pthread_mutex_t * mutex,
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const pthread_mutexattr_t * mutex_attr)
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{
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__pthread_init_lock(&mutex->__m_lock);
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mutex->__m_kind =
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mutex_attr == NULL ? PTHREAD_MUTEX_FAST_NP : mutex_attr->__mutexkind;
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mutex->__m_count = 0;
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mutex->__m_owner = NULL;
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return 0;
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}
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strong_alias (__pthread_mutex_init, pthread_mutex_init)
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int __pthread_mutex_destroy(pthread_mutex_t * mutex)
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{
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if (mutex->__m_lock.__status != 0) return EBUSY;
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return 0;
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}
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strong_alias (__pthread_mutex_destroy, pthread_mutex_destroy)
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int __pthread_mutex_trylock(pthread_mutex_t * mutex)
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{
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pthread_descr self;
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int retcode;
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switch(mutex->__m_kind) {
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case PTHREAD_MUTEX_FAST_NP:
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retcode = __pthread_trylock(&mutex->__m_lock);
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return retcode;
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case PTHREAD_MUTEX_RECURSIVE_NP:
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self = thread_self();
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if (mutex->__m_owner == self) {
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mutex->__m_count++;
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return 0;
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}
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retcode = __pthread_trylock(&mutex->__m_lock);
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if (retcode == 0) {
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mutex->__m_owner = self;
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mutex->__m_count = 0;
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}
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return retcode;
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case PTHREAD_MUTEX_ERRORCHECK_NP:
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retcode = __pthread_trylock(&mutex->__m_lock);
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if (retcode == 0) {
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mutex->__m_owner = thread_self();
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}
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return retcode;
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default:
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return EINVAL;
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}
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}
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strong_alias (__pthread_mutex_trylock, pthread_mutex_trylock)
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int __pthread_mutex_lock(pthread_mutex_t * mutex)
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{
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pthread_descr self;
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switch(mutex->__m_kind) {
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case PTHREAD_MUTEX_FAST_NP:
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__pthread_lock(&mutex->__m_lock, NULL);
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return 0;
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case PTHREAD_MUTEX_RECURSIVE_NP:
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self = thread_self();
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if (mutex->__m_owner == self) {
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mutex->__m_count++;
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return 0;
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}
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__pthread_lock(&mutex->__m_lock, self);
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mutex->__m_owner = self;
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mutex->__m_count = 0;
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return 0;
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case PTHREAD_MUTEX_ERRORCHECK_NP:
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self = thread_self();
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if (mutex->__m_owner == self) return EDEADLK;
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__pthread_lock(&mutex->__m_lock, self);
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mutex->__m_owner = self;
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return 0;
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default:
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return EINVAL;
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}
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}
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strong_alias (__pthread_mutex_lock, pthread_mutex_lock)
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int __pthread_mutex_unlock(pthread_mutex_t * mutex)
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{
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switch (mutex->__m_kind) {
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case PTHREAD_MUTEX_FAST_NP:
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__pthread_unlock(&mutex->__m_lock);
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return 0;
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case PTHREAD_MUTEX_RECURSIVE_NP:
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if (mutex->__m_count > 0) {
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mutex->__m_count--;
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return 0;
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}
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mutex->__m_owner = NULL;
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__pthread_unlock(&mutex->__m_lock);
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return 0;
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case PTHREAD_MUTEX_ERRORCHECK_NP:
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if (mutex->__m_owner != thread_self() || mutex->__m_lock.__status == 0)
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return EPERM;
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mutex->__m_owner = NULL;
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__pthread_unlock(&mutex->__m_lock);
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return 0;
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default:
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return EINVAL;
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}
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}
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strong_alias (__pthread_mutex_unlock, pthread_mutex_unlock)
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int __pthread_mutexattr_init(pthread_mutexattr_t *attr)
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{
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attr->__mutexkind = PTHREAD_MUTEX_FAST_NP;
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return 0;
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}
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strong_alias (__pthread_mutexattr_init, pthread_mutexattr_init)
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int __pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
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{
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return 0;
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}
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strong_alias (__pthread_mutexattr_destroy, pthread_mutexattr_destroy)
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int __pthread_mutexattr_settype(pthread_mutexattr_t *attr, int kind)
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{
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if (kind != PTHREAD_MUTEX_FAST_NP
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&& kind != PTHREAD_MUTEX_RECURSIVE_NP
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&& kind != PTHREAD_MUTEX_ERRORCHECK_NP)
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return EINVAL;
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attr->__mutexkind = kind;
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return 0;
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}
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weak_alias (__pthread_mutexattr_settype, pthread_mutexattr_settype)
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strong_alias ( __pthread_mutexattr_settype, __pthread_mutexattr_setkind_np)
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weak_alias (__pthread_mutexattr_setkind_np, pthread_mutexattr_setkind_np)
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int __pthread_mutexattr_gettype(const pthread_mutexattr_t *attr, int *kind)
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{
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*kind = attr->__mutexkind;
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return 0;
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}
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weak_alias (__pthread_mutexattr_gettype, pthread_mutexattr_gettype)
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strong_alias (__pthread_mutexattr_gettype, __pthread_mutexattr_getkind_np)
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weak_alias (__pthread_mutexattr_getkind_np, pthread_mutexattr_getkind_np)
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/* Once-only execution */
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static pthread_mutex_t once_masterlock = PTHREAD_MUTEX_INITIALIZER;
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static pthread_cond_t once_finished = PTHREAD_COND_INITIALIZER;
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enum { NEVER = 0, IN_PROGRESS = 1, DONE = 2 };
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int __pthread_once(pthread_once_t * once_control, void (*init_routine)(void))
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{
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/* Test without locking first for speed */
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if (*once_control == DONE) return 0;
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/* Lock and test again */
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pthread_mutex_lock(&once_masterlock);
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/* If init_routine is being called from another routine, wait until
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it completes. */
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while (*once_control == IN_PROGRESS) {
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pthread_cond_wait(&once_finished, &once_masterlock);
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}
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/* Here *once_control is stable and either NEVER or DONE. */
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if (*once_control == NEVER) {
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*once_control = IN_PROGRESS;
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pthread_mutex_unlock(&once_masterlock);
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init_routine();
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pthread_mutex_lock(&once_masterlock);
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*once_control = DONE;
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pthread_cond_broadcast(&once_finished);
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}
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pthread_mutex_unlock(&once_masterlock);
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return 0;
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}
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strong_alias (__pthread_once, pthread_once)
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