+++ /dev/null
-/*
- * Copyright 1996 1995 by Open Software Foundation, Inc. 1997 1996 1995 1994 1993 1992 1991
- * All Rights Reserved
- *
- * Permission to use, copy, modify, and distribute this software and
- * its documentation for any purpose and without fee is hereby granted,
- * provided that the above copyright notice appears in all copies and
- * that both the copyright notice and this permission notice appear in
- * supporting documentation.
- *
- * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
- * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE.
- *
- * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
- * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
- * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
- * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-/*
- * MkLinux
- */
-
-/*
- * POSIX Pthread Library
- */
-
-#include "pthread_internals.h"
-#include <sys/time.h> /* For struct timespec and getclock(). */
-#include <stdio.h>
-
- /*
- * Destroy a condition variable.
- */
-int
-pthread_cond_destroy(pthread_cond_t *cond)
-{
- if (cond->sig == _PTHREAD_COND_SIG)
- {
- LOCK(cond->lock);
- if (cond->busy != (pthread_mutex_t *)NULL)
- {
- UNLOCK(cond->lock);
- return (EBUSY);
- } else
- {
- cond->sig = _PTHREAD_NO_SIG;
- UNLOCK(cond->lock);
- return (ESUCCESS);
- }
- } else
- return (EINVAL); /* Not an initialized condition variable structure */
-}
-
-/*
- * Initialize a condition variable. Note: 'attr' is ignored.
- */
-int
-pthread_cond_init(pthread_cond_t *cond,
- const pthread_condattr_t *attr)
-{
- LOCK_INIT(cond->lock);
- cond->sig = _PTHREAD_COND_SIG;
- cond->next = (pthread_cond_t *)NULL;
- cond->prev = (pthread_cond_t *)NULL;
- cond->busy = (pthread_mutex_t *)NULL;
- cond->waiters = 0;
- cond->sigspending = 0;
- cond->sem = MACH_PORT_NULL;
- return (ESUCCESS);
-}
-
-/*
- * Signal a condition variable, waking up all threads waiting for it.
- */
-int
-pthread_cond_broadcast(pthread_cond_t *cond)
-{
- kern_return_t kern_res;
- int res;
- if (cond->sig == _PTHREAD_COND_SIG_init) {
- if ((res = pthread_cond_init(cond, NULL)) != 0) {
- return (res);
- }
- }
- if (cond->sig != _PTHREAD_COND_SIG) {
- /* Not a condition variable */
- return (EINVAL);
- }
- LOCK(cond->lock);
- if (cond->sem == MACH_PORT_NULL) {
- /* Avoid kernel call since there are no waiters... */
- UNLOCK(cond->lock);
- return (ESUCCESS);
- }
- cond->sigspending++;
- UNLOCK(cond->lock);
- PTHREAD_MACH_CALL(semaphore_signal_all(cond->sem), kern_res);
- LOCK(cond->lock);
- cond->sigspending--;
- if (cond->waiters == 0 && cond->sigspending == 0) {
- restore_sem_to_pool(cond->sem);
- cond->sem = MACH_PORT_NULL;
- }
- UNLOCK(cond->lock);
- if (kern_res != KERN_SUCCESS) {
- return (EINVAL);
- }
- return (ESUCCESS);
-}
-
-/*
- * Signal a condition variable, waking a specified thread.
- */
-int
-pthread_cond_signal_thread_np(pthread_cond_t *cond, pthread_t thread)
-{
- kern_return_t kern_res;
- if (cond->sig == _PTHREAD_COND_SIG_init) {
- int res;
- if ((res = pthread_cond_init(cond, NULL)) != 0) {
- return (res);
- }
- }
- if (cond->sig != _PTHREAD_COND_SIG) {
- return (EINVAL); /* Not a condition variable */
- }
- LOCK(cond->lock);
- if (cond->sem == MACH_PORT_NULL) {
- /* Avoid kernel call since there are not enough waiters... */
- UNLOCK(cond->lock);
- return (ESUCCESS);
- }
- cond->sigspending++;
- UNLOCK(cond->lock);
- if (thread == (pthread_t)NULL) {
- kern_res = semaphore_signal_thread(cond->sem, MACH_PORT_NULL);
- if (kern_res == KERN_INVALID_ARGUMENT) {
- PTHREAD_MACH_CALL(semaphore_signal(cond->sem), kern_res);
- } else if (kern_res == KERN_NOT_WAITING) {
- kern_res = KERN_SUCCESS;
- }
- } else if (thread->sig == _PTHREAD_SIG) {
- PTHREAD_MACH_CALL(semaphore_signal_thread(cond->sem, thread->kernel_thread), kern_res);
- } else {
- kern_res = KERN_FAILURE;
- }
- LOCK(cond->lock);
- cond->sigspending--;
- if (cond->waiters == 0 && cond->sigspending == 0) {
- restore_sem_to_pool(cond->sem);
- cond->sem = MACH_PORT_NULL;
- }
- UNLOCK(cond->lock);
- if (kern_res != KERN_SUCCESS) {
- return (EINVAL);
- }
- return (ESUCCESS);
-}
-
-/*
- * Signal a condition variable, waking only one thread.
- */
-int
-pthread_cond_signal(pthread_cond_t *cond)
-{
- return pthread_cond_signal_thread_np(cond, NULL);
-}
-
-/*
- * Manage a list of condition variables associated with a mutex
- */
-
-static void
-_pthread_cond_add(pthread_cond_t *cond, pthread_mutex_t *mutex)
-{
- pthread_cond_t *c;
- LOCK(mutex->lock);
- if ((c = mutex->busy) != (pthread_cond_t *)NULL)
- {
- c->prev = cond;
- }
- cond->next = c;
- cond->prev = (pthread_cond_t *)NULL;
- mutex->busy = cond;
- UNLOCK(mutex->lock);
- if (cond->sem == MACH_PORT_NULL) {
- cond->sem = new_sem_from_pool();
- }
-}
-
-static void
-_pthread_cond_remove(pthread_cond_t *cond, pthread_mutex_t *mutex)
-{
- pthread_cond_t *n, *p;
- LOCK(mutex->lock);
- if ((n = cond->next) != (pthread_cond_t *)NULL)
- {
- n->prev = cond->prev;
- }
- if ((p = cond->prev) != (pthread_cond_t *)NULL)
- {
- p->next = cond->next;
- } else
- { /* This is the first in the list */
- mutex->busy = n;
- }
- UNLOCK(mutex->lock);
- if (cond->sigspending == 0) {
- restore_sem_to_pool(cond->sem);
- cond->sem = MACH_PORT_NULL;
- }
-}
-
-/*
- * Suspend waiting for a condition variable.
- * Note: we have to keep a list of condition variables which are using
- * this same mutex variable so we can detect invalid 'destroy' sequences.
- */
-static int
-_pthread_cond_wait(pthread_cond_t *cond,
- pthread_mutex_t *mutex,
- const struct timespec *abstime,
- int isRelative)
-{
- int res;
- kern_return_t kern_res;
- pthread_mutex_t *busy;
- mach_timespec_t then;
- if (cond->sig == _PTHREAD_COND_SIG_init) {
- if ((res = pthread_cond_init(cond, NULL)) != 0) {
- return (res);
- }
- }
- if (cond->sig != _PTHREAD_COND_SIG) {
- /* Not a condition variable */
- return (EINVAL);
- }
-
- if (abstime) {
- if (isRelative == 0) {
- struct timespec now;
- struct timeval tv;
- gettimeofday(&tv, NULL);
- TIMEVAL_TO_TIMESPEC(&tv, &now);
-
- /* Compute relative time to sleep */
- then.tv_nsec = abstime->tv_nsec - now.tv_nsec;
- then.tv_sec = abstime->tv_sec - now.tv_sec;
- if (then.tv_nsec < 0) {
- then.tv_nsec += 1000000000; /* nsec/sec */
- then.tv_sec--;
- }
- if (((int)then.tv_sec < 0) ||
- ((then.tv_sec == 0) && (then.tv_nsec == 0))) {
- return ETIMEDOUT;
- }
- } else {
- then.tv_sec = abstime->tv_sec;
- then.tv_nsec = abstime->tv_nsec;
- }
- }
- LOCK(cond->lock);
- busy = cond->busy;
- if ((busy != (pthread_mutex_t *)NULL) && (busy != mutex)) {
- /* Must always specify the same mutex! */
- UNLOCK(cond->lock);
- return (EINVAL);
- }
- cond->waiters++;
- if (cond->waiters == 1) {
- _pthread_cond_add(cond, mutex);
- cond->busy = mutex;
- }
- UNLOCK(cond->lock);
- LOCK(mutex->lock);
- if (mutex->sem == MACH_PORT_NULL) {
- mutex->sem = new_sem_from_pool();
- }
- mutex->cond_lock = 1;
- UNLOCK(mutex->lock);
- if (abstime) {
- kern_res = semaphore_timedwait_signal(cond->sem, mutex->sem, then);
- } else {
- PTHREAD_MACH_CALL(semaphore_wait_signal(cond->sem, mutex->sem), kern_res);
- }
- LOCK(cond->lock);
- cond->waiters--;
- if (cond->waiters == 0) {
- _pthread_cond_remove(cond, mutex);
- cond->busy = (pthread_mutex_t *)NULL;
- }
- UNLOCK(cond->lock);
- if ((res = pthread_mutex_lock(mutex)) != ESUCCESS) {
- return (res);
- }
- /* KERN_ABORTED can be treated as a spurious wakeup */
- if ((kern_res == KERN_SUCCESS) || (kern_res == KERN_ABORTED)) {
- return (ESUCCESS);
- } else if (kern_res == KERN_OPERATION_TIMED_OUT) {
- return (ETIMEDOUT);
- } else {
- return (EINVAL);
- }
-}
-
-int
-pthread_cond_wait(pthread_cond_t *cond,
- pthread_mutex_t *mutex)
-{
- return (_pthread_cond_wait(cond, mutex, (struct timespec *)NULL, 0));
-}
-
-int
-pthread_cond_timedwait(pthread_cond_t *cond,
- pthread_mutex_t *mutex,
- const struct timespec *abstime)
-{
- return (_pthread_cond_wait(cond, mutex, abstime, 0));
-}
-
-int
-pthread_cond_timedwait_relative_np(pthread_cond_t *cond,
- pthread_mutex_t *mutex,
- const struct timespec *abstime)
-{
- return (_pthread_cond_wait(cond, mutex, abstime, 1));
-}
-
projects / apple / libc.git / blobdiff