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--- Libc/Libc-262.3.2/pthreads/pthread_cond.c
+++ Libc/Libc-320/pthreads/pthread_cond.c
@@ -1,3 +1,27 @@
+/*
+ * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
/*
* Copyright 1996 1995 by Open Software Foundation, Inc. 1997 1996 1995 1994 1993 1992 1991
* All Rights Reserved
@@ -30,45 +54,64 @@
#include <sys/time.h> /* For struct timespec and getclock(). */
#include <stdio.h>
- /*
+extern void _pthread_mutex_remove(pthread_mutex_t *, pthread_t);
+
+/*
* Destroy a condition variable.
*/
int
pthread_cond_destroy(pthread_cond_t *cond)
{
+ int ret;
+ int sig = cond->sig;
+
+ /* to provide backwards compat for apps using united condtn vars */
+ if((sig != _PTHREAD_COND_SIG) && (sig !=_PTHREAD_COND_SIG_init))
+ return(EINVAL);
+
+ LOCK(cond->lock);
if (cond->sig == _PTHREAD_COND_SIG)
{
- LOCK(cond->lock);
- if (cond->busy != (pthread_mutex_t *)NULL)
- {
- UNLOCK(cond->lock);
- return (EBUSY);
+ if (cond->busy == (pthread_mutex_t *)NULL)
+ {
+ cond->sig = _PTHREAD_NO_SIG;
+ ret = ESUCCESS;
} else
- {
- cond->sig = _PTHREAD_NO_SIG;
- UNLOCK(cond->lock);
- return (ESUCCESS);
- }
+ ret = EBUSY;
} else
- return (EINVAL); /* Not an initialized condition variable structure */
+ ret = EINVAL; /* Not an initialized condition variable structure */
+ UNLOCK(cond->lock);
+ return (ret);
}
/*
* Initialize a condition variable. Note: 'attr' is ignored.
*/
-int
-pthread_cond_init(pthread_cond_t *cond,
+static 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);
+ cond->sem = SEMAPHORE_NULL;
+ cond->sig = _PTHREAD_COND_SIG;
+ return (ESUCCESS);
+}
+
+/*
+ * Initialize a condition variable. This is the public interface.
+ * We can't trust the lock, so initialize it first before taking
+ * it.
+ */
+int
+pthread_cond_init(pthread_cond_t *cond,
+ const pthread_condattr_t *attr)
+{
+ LOCK_INIT(cond->lock);
+ return (_pthread_cond_init(cond, attr));
}
/*
@@ -77,37 +120,50 @@
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);
+ kern_return_t kern_res;
+ semaphore_t sem;
+ int sig = cond->sig;
+
+ /* to provide backwards compat for apps using united condtn vars */
+ if((sig != _PTHREAD_COND_SIG) && (sig !=_PTHREAD_COND_SIG_init))
+ return(EINVAL);
+
+ LOCK(cond->lock);
+ if (cond->sig != _PTHREAD_COND_SIG)
+ {
+ int res;
+
+ if (cond->sig == _PTHREAD_COND_SIG_init)
+ {
+ _pthread_cond_init(cond, NULL);
+ res = ESUCCESS;
+ } else
+ res = EINVAL; /* Not a condition variable */
+ UNLOCK(cond->lock);
+ return (res);
+ }
+ else if ((sem = cond->sem) == SEMAPHORE_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(sem), kern_res);
+
+ LOCK(cond->lock);
+ cond->sigspending--;
+ if (cond->waiters == 0 && cond->sigspending == 0)
+ {
+ cond->sem = SEMAPHORE_NULL;
+ restore_sem_to_pool(sem);
+ }
+ UNLOCK(cond->lock);
+ if (kern_res != KERN_SUCCESS)
+ return (EINVAL);
+ return (ESUCCESS);
}
/*
@@ -116,48 +172,63 @@
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, pthread_mach_thread_np(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);
+ kern_return_t kern_res;
+ semaphore_t sem;
+ int sig = cond->sig;
+
+ /* to provide backwards compat for apps using united condtn vars */
+ if((sig != _PTHREAD_COND_SIG) && (sig !=_PTHREAD_COND_SIG_init))
+ return(EINVAL);
+
+ LOCK(cond->lock);
+ if (cond->sig != _PTHREAD_COND_SIG)
+ {
+ int ret;
+
+ if (cond->sig == _PTHREAD_COND_SIG_init)
+ {
+ _pthread_cond_init(cond, NULL);
+ ret = ESUCCESS;
+ }
+ else
+ ret = EINVAL; /* Not a condition variable */
+ UNLOCK(cond->lock);
+ return (ret);
+ }
+ else if ((sem = cond->sem) == SEMAPHORE_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(sem, THREAD_NULL);
+ if (kern_res == KERN_NOT_WAITING)
+ kern_res = KERN_SUCCESS;
+ }
+ else if (thread->sig == _PTHREAD_SIG)
+ {
+ PTHREAD_MACH_CALL(semaphore_signal_thread(
+ sem, pthread_mach_thread_np(thread)), kern_res);
+ }
+ else
+ kern_res = KERN_FAILURE;
+
+ LOCK(cond->lock);
+ cond->sigspending--;
+ if (cond->waiters == 0 && cond->sigspending == 0)
+ {
+ cond->sem = SEMAPHORE_NULL;
+ restore_sem_to_pool(sem);
+ }
+ UNLOCK(cond->lock);
+ if (kern_res != KERN_SUCCESS)
+ return (EINVAL);
+ return (ESUCCESS);
}
/*
@@ -166,7 +237,7 @@
int
pthread_cond_signal(pthread_cond_t *cond)
{
- return pthread_cond_signal_thread_np(cond, NULL);
+ return pthread_cond_signal_thread_np(cond, NULL);
}
/*
@@ -186,15 +257,15 @@
cond->prev = (pthread_cond_t *)NULL;
mutex->busy = cond;
UNLOCK(mutex->lock);
- if (cond->sem == MACH_PORT_NULL) {
+ if (cond->sem == SEMAPHORE_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)
{
@@ -203,14 +274,16 @@
if ((p = cond->prev) != (pthread_cond_t *)NULL)
{
p->next = cond->next;
- } else
+ }
+ 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;
+ if (cond->sigspending == 0)
+ {
+ restore_sem_to_pool(cond->sem);
+ cond->sem = SEMAPHORE_NULL;
}
}
@@ -225,88 +298,120 @@
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 += NSEC_PER_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;
- }
- if (then.tv_nsec >= NSEC_PER_SEC) {
- return EINVAL;
- }
- }
- 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 res;
+ kern_return_t kern_res;
+ pthread_mutex_t *busy;
+ mach_timespec_t then;
+ int sig = cond->sig;
+
+ /* to provide backwards compat for apps using united condtn vars */
+ if((sig != _PTHREAD_COND_SIG) && (sig !=_PTHREAD_COND_SIG_init))
+ return(EINVAL);
+ LOCK(cond->lock);
+ if (cond->sig != _PTHREAD_COND_SIG)
+ {
+ if (cond->sig != _PTHREAD_COND_SIG_init)
+ {
+ UNLOCK(cond->lock);
+ return (EINVAL); /* Not a condition variable */
+ }
+ _pthread_cond_init(cond, NULL);
+ }
+
+ 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 += NSEC_PER_SEC;
+ then.tv_sec--;
+ }
+ if (((int)then.tv_sec < 0) ||
+ ((then.tv_sec == 0) && (then.tv_nsec == 0)))
+ {
+ UNLOCK(cond->lock);
+ return ETIMEDOUT;
+ }
+ }
+ else
+ {
+ then.tv_sec = abstime->tv_sec;
+ then.tv_nsec = abstime->tv_nsec;
+ }
+ if (then.tv_nsec >= NSEC_PER_SEC)
+ {
+ UNLOCK(cond->lock);
+ return EINVAL;
+ }
+ }
+
+ if (++cond->waiters == 1)
+ {
+ _pthread_cond_add(cond, mutex);
+ cond->busy = mutex;
+ }
+ else if ((busy = cond->busy) != mutex)
+ {
+ /* Must always specify the same mutex! */
+ cond->waiters--;
+ UNLOCK(cond->lock);
+ return (EINVAL);
+ }
+ UNLOCK(cond->lock);
+
+#if defined(DEBUG)
+ _pthread_mutex_remove(mutex, pthread_self());
+#endif
+ LOCK(mutex->lock);
+ if (--mutex->lock_count == 0)
+ {
+ if (mutex->sem == SEMAPHORE_NULL)
+ mutex->sem = new_sem_from_pool();
+ mutex->owner = _PTHREAD_MUTEX_OWNER_SWITCHING;
+ 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);
+ }
+ }
+ else
+ {
+ UNLOCK(mutex->lock);
+ if (abstime) {
+ kern_res = semaphore_timedwait(cond->sem, then);
+ } else {
+ PTHREAD_MACH_CALL(semaphore_wait(cond->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);
+ return (EINVAL);
}
int