Loading...
--- /dev/null
+++ Libc/Libc-498/pthreads/pthread_mutex.c
@@ -0,0 +1,807 @@
+/*
+ * Copyright (c) 2000-2003, 2007 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * 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
+ *
+ * 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
+ * -- Mutex variable support
+ */
+
+#include "pthread_internals.h"
+
+#include "plockstat.h"
+
+extern int __unix_conforming;
+
+#ifndef BUILDING_VARIANT /* [ */
+
+#define BLOCK_FAIL_PLOCKSTAT 0
+#define BLOCK_SUCCESS_PLOCKSTAT 1
+
+/* This function is never called and exists to provide never-fired dtrace
+ * probes so that user d scripts don't get errors.
+ */
+__private_extern__ void _plockstat_never_fired(void)
+{
+ PLOCKSTAT_MUTEX_SPIN(NULL);
+ PLOCKSTAT_MUTEX_SPUN(NULL, 0, 0);
+}
+
+/*
+ * Destroy a mutex variable.
+ */
+int
+pthread_mutex_destroy(pthread_mutex_t *mutex)
+{
+ int res;
+
+ LOCK(mutex->lock);
+ if (mutex->sig == _PTHREAD_MUTEX_SIG)
+ {
+ if (mutex->owner == (pthread_t)NULL &&
+ mutex->busy == (pthread_cond_t *)NULL)
+ {
+ mutex->sig = _PTHREAD_NO_SIG;
+ res = 0;
+ }
+ else
+ res = EBUSY;
+ } else if (mutex->sig == _PTHREAD_KERN_MUTEX_SIG) {
+ int mutexid = mutex->_pthread_mutex_kernid;
+ UNLOCK(mutex->lock);
+ if( __pthread_mutex_destroy(mutexid) == -1)
+ return(errno);
+ mutex->sig = _PTHREAD_NO_SIG;
+ return(0);
+ } else
+ res = EINVAL;
+ UNLOCK(mutex->lock);
+ return (res);
+}
+
+#ifdef PR_5243343
+/* 5243343 - temporary hack to detect if we are running the conformance test */
+extern int PR_5243343_flag;
+#endif /* PR_5243343 */
+/*
+ * Initialize a mutex variable, possibly with additional attributes.
+ */
+static int
+_pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
+{
+ if (attr)
+ {
+ if (attr->sig != _PTHREAD_MUTEX_ATTR_SIG)
+ return (EINVAL);
+ mutex->prioceiling = attr->prioceiling;
+ mutex->protocol = attr->protocol;
+ mutex->type = attr->type;
+ mutex->pshared = attr->pshared;
+ if (attr->pshared == PTHREAD_PROCESS_SHARED) {
+ mutex->lock_count = 0;
+ mutex->owner = (pthread_t)NULL;
+ mutex->next = (pthread_mutex_t *)NULL;
+ mutex->prev = (pthread_mutex_t *)NULL;
+ mutex->busy = (pthread_cond_t *)NULL;
+ mutex->waiters = 0;
+ mutex->sem = SEMAPHORE_NULL;
+ mutex->order = SEMAPHORE_NULL;
+ mutex->sig = 0;
+ if( __pthread_mutex_init(mutex, attr) == -1)
+ return(errno);
+ mutex->sig = _PTHREAD_KERN_MUTEX_SIG;
+ return(0);
+ }
+ } else {
+ mutex->prioceiling = _PTHREAD_DEFAULT_PRIOCEILING;
+ mutex->protocol = _PTHREAD_DEFAULT_PROTOCOL;
+ mutex->type = PTHREAD_MUTEX_DEFAULT;
+ mutex->pshared = _PTHREAD_DEFAULT_PSHARED;
+ }
+ mutex->lock_count = 0;
+ mutex->owner = (pthread_t)NULL;
+ mutex->next = (pthread_mutex_t *)NULL;
+ mutex->prev = (pthread_mutex_t *)NULL;
+ mutex->busy = (pthread_cond_t *)NULL;
+ mutex->waiters = 0;
+ mutex->sem = SEMAPHORE_NULL;
+ mutex->order = SEMAPHORE_NULL;
+ mutex->sig = _PTHREAD_MUTEX_SIG;
+ return (0);
+}
+
+/*
+ * Initialize a mutex variable, possibly with additional attributes.
+ * Public interface - so don't trust the lock - initialize it first.
+ */
+int
+pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
+{
+#if 0
+ /* conformance tests depend on not having this behavior */
+ /* The test for this behavior is optional */
+ if (mutex->sig == _PTHREAD_MUTEX_SIG)
+ return EBUSY;
+#endif
+ LOCK_INIT(mutex->lock);
+ return (_pthread_mutex_init(mutex, attr));
+}
+
+/*
+ * Manage a list of mutex variables owned by a thread
+ */
+#if defined(DEBUG)
+static void
+_pthread_mutex_add(pthread_mutex_t *mutex, pthread_t self)
+{
+ pthread_mutex_t *m;
+ if (self != (pthread_t)0)
+ {
+ if ((m = self->mutexes) != (pthread_mutex_t *)NULL)
+ { /* Add to list */
+ m->prev = mutex;
+ }
+ mutex->next = m;
+ mutex->prev = (pthread_mutex_t *)NULL;
+ self->mutexes = mutex;
+ }
+}
+
+__private_extern__ void
+_pthread_mutex_remove(pthread_mutex_t *mutex, pthread_t self)
+{
+ pthread_mutex_t *n, *prev;
+ if ((n = mutex->next) != (pthread_mutex_t *)NULL)
+ {
+ n->prev = mutex->prev;
+ }
+ if ((prev = mutex->prev) != (pthread_mutex_t *)NULL)
+ {
+ prev->next = mutex->next;
+ } else
+ { /* This is the first in the list */
+ if (self != (pthread_t)0) {
+ self->mutexes = n;
+ }
+ }
+}
+#endif
+
+/*
+ * Lock a mutex.
+ * TODO: Priority inheritance stuff
+ */
+int
+pthread_mutex_lock(pthread_mutex_t *mutex)
+{
+ kern_return_t kern_res;
+ pthread_t self;
+ int sig = mutex->sig;
+
+ /* To provide backwards compat for apps using mutex incorrectly */
+ if ((sig != _PTHREAD_MUTEX_SIG) && (sig != _PTHREAD_MUTEX_SIG_init) && (sig != _PTHREAD_KERN_MUTEX_SIG)) {
+ PLOCKSTAT_MUTEX_ERROR(mutex, EINVAL);
+ return(EINVAL);
+ }
+ LOCK(mutex->lock);
+ if (mutex->sig != _PTHREAD_MUTEX_SIG)
+ {
+ if (mutex->sig != _PTHREAD_MUTEX_SIG_init)
+ {
+ if (mutex->sig == _PTHREAD_KERN_MUTEX_SIG) {
+ int mutexid = mutex->_pthread_mutex_kernid;
+ UNLOCK(mutex->lock);
+
+ PLOCKSTAT_MUTEX_BLOCK(mutex);
+ if( __pthread_mutex_lock(mutexid) == -1) {
+ PLOCKSTAT_MUTEX_BLOCKED(mutex, BLOCK_FAIL_PLOCKSTAT);
+ PLOCKSTAT_MUTEX_ERROR(mutex, errno);
+ return(errno);
+ }
+
+ PLOCKSTAT_MUTEX_BLOCKED(mutex, BLOCK_SUCCESS_PLOCKSTAT);
+ PLOCKSTAT_MUTEX_ACQUIRE(mutex, 0, 0);
+ return(0);
+ } else {
+ UNLOCK(mutex->lock);
+ PLOCKSTAT_MUTEX_ERROR(mutex, EINVAL);
+ return (EINVAL);
+ }
+ }
+ _pthread_mutex_init(mutex, NULL);
+ self = _PTHREAD_MUTEX_OWNER_SELF;
+ }
+ else if (mutex->type != PTHREAD_MUTEX_NORMAL)
+ {
+ self = pthread_self();
+ if (mutex->owner == self)
+ {
+ int res;
+
+ if (mutex->type == PTHREAD_MUTEX_RECURSIVE)
+ {
+ if (mutex->lock_count < USHRT_MAX)
+ {
+ mutex->lock_count++;
+ PLOCKSTAT_MUTEX_ACQUIRE(mutex, 1, 0);
+ res = 0;
+ } else {
+ res = EAGAIN;
+ PLOCKSTAT_MUTEX_ERROR(mutex, res);
+ }
+ } else { /* PTHREAD_MUTEX_ERRORCHECK */
+ res = EDEADLK;
+ PLOCKSTAT_MUTEX_ERROR(mutex, res);
+ }
+ UNLOCK(mutex->lock);
+ return (res);
+ }
+ } else
+ self = _PTHREAD_MUTEX_OWNER_SELF;
+
+ if (mutex->owner != (pthread_t)NULL) {
+ if (mutex->waiters || mutex->owner != _PTHREAD_MUTEX_OWNER_SWITCHING)
+ {
+ semaphore_t sem, order;
+
+ if (++mutex->waiters == 1)
+ {
+ mutex->sem = sem = new_sem_from_pool();
+ mutex->order = order = new_sem_from_pool();
+ }
+ else
+ {
+ sem = mutex->sem;
+ order = mutex->order;
+ do {
+ PTHREAD_MACH_CALL(semaphore_wait(order), kern_res);
+ } while (kern_res == KERN_ABORTED);
+ }
+ UNLOCK(mutex->lock);
+
+ PLOCKSTAT_MUTEX_BLOCK(mutex);
+ PTHREAD_MACH_CALL(semaphore_wait_signal(sem, order), kern_res);
+ while (kern_res == KERN_ABORTED)
+ {
+ PTHREAD_MACH_CALL(semaphore_wait(sem), kern_res);
+ }
+
+ PLOCKSTAT_MUTEX_BLOCKED(mutex, BLOCK_SUCCESS_PLOCKSTAT);
+
+ LOCK(mutex->lock);
+ if (--mutex->waiters == 0)
+ {
+ PTHREAD_MACH_CALL(semaphore_wait(order), kern_res);
+ mutex->sem = mutex->order = SEMAPHORE_NULL;
+ restore_sem_to_pool(order);
+ restore_sem_to_pool(sem);
+ }
+ }
+ else if (mutex->owner == _PTHREAD_MUTEX_OWNER_SWITCHING)
+ {
+ semaphore_t sem = mutex->sem;
+ do {
+ PTHREAD_MACH_CALL(semaphore_wait(sem), kern_res);
+ } while (kern_res == KERN_ABORTED);
+ mutex->sem = SEMAPHORE_NULL;
+ restore_sem_to_pool(sem);
+ }
+ }
+
+ mutex->lock_count = 1;
+ mutex->owner = self;
+#if defined(DEBUG)
+ _pthread_mutex_add(mutex, self);
+#endif
+ UNLOCK(mutex->lock);
+ PLOCKSTAT_MUTEX_ACQUIRE(mutex, 0, 0);
+ return (0);
+}
+
+/*
+ * Attempt to lock a mutex, but don't block if this isn't possible.
+ */
+int
+pthread_mutex_trylock(pthread_mutex_t *mutex)
+{
+ kern_return_t kern_res;
+ pthread_t self;
+
+ LOCK(mutex->lock);
+ if (mutex->sig != _PTHREAD_MUTEX_SIG)
+ {
+ if (mutex->sig != _PTHREAD_MUTEX_SIG_init)
+ {
+
+ if (mutex->sig == _PTHREAD_KERN_MUTEX_SIG) {
+ int mutexid = mutex->_pthread_mutex_kernid;
+ UNLOCK(mutex->lock);
+ if( __pthread_mutex_trylock(mutexid) == -1) {
+ PLOCKSTAT_MUTEX_ERROR(mutex, errno);
+ return(errno);
+ }
+ PLOCKSTAT_MUTEX_ACQUIRE(mutex, 0, 0);
+ return(0);
+ } else {
+ PLOCKSTAT_MUTEX_ERROR(mutex, EINVAL);
+ UNLOCK(mutex->lock);
+ return (EINVAL);
+ }
+ }
+ _pthread_mutex_init(mutex, NULL);
+ self = _PTHREAD_MUTEX_OWNER_SELF;
+ }
+ else if (mutex->type != PTHREAD_MUTEX_NORMAL)
+ {
+ self = pthread_self();
+ if (mutex->type == PTHREAD_MUTEX_RECURSIVE)
+ {
+ if (mutex->owner == self)
+ {
+ int res;
+
+ if (mutex->lock_count < USHRT_MAX)
+ {
+ mutex->lock_count++;
+ PLOCKSTAT_MUTEX_ACQUIRE(mutex, 1, 0);
+ res = 0;
+ } else {
+ res = EAGAIN;
+ PLOCKSTAT_MUTEX_ERROR(mutex, res);
+ }
+ UNLOCK(mutex->lock);
+ return (res);
+ }
+ }
+ } else
+ self = _PTHREAD_MUTEX_OWNER_SELF;
+
+ if (mutex->owner != (pthread_t)NULL)
+ {
+ if (mutex->waiters || mutex->owner != _PTHREAD_MUTEX_OWNER_SWITCHING)
+ {
+ PLOCKSTAT_MUTEX_ERROR(mutex, EBUSY);
+ UNLOCK(mutex->lock);
+ return (EBUSY);
+ }
+ else if (mutex->owner == _PTHREAD_MUTEX_OWNER_SWITCHING)
+ {
+ semaphore_t sem = mutex->sem;
+
+ do {
+ PTHREAD_MACH_CALL(semaphore_wait(sem), kern_res);
+ } while (kern_res == KERN_ABORTED);
+ restore_sem_to_pool(sem);
+ mutex->sem = SEMAPHORE_NULL;
+ }
+ }
+
+ mutex->lock_count = 1;
+ mutex->owner = self;
+#if defined(DEBUG)
+ _pthread_mutex_add(mutex, self);
+#endif
+ UNLOCK(mutex->lock);
+ PLOCKSTAT_MUTEX_ACQUIRE(mutex, 0, 0);
+ return (0);
+}
+
+/*
+ * Unlock a mutex.
+ * TODO: Priority inheritance stuff
+ */
+int
+pthread_mutex_unlock(pthread_mutex_t *mutex)
+{
+ kern_return_t kern_res;
+ int waiters;
+ int sig = mutex->sig;
+
+ /* To provide backwards compat for apps using mutex incorrectly */
+
+ if ((sig != _PTHREAD_MUTEX_SIG) && (sig != _PTHREAD_MUTEX_SIG_init) && (sig != _PTHREAD_KERN_MUTEX_SIG)) {
+ PLOCKSTAT_MUTEX_ERROR(mutex, EINVAL);
+ return(EINVAL);
+ }
+ LOCK(mutex->lock);
+ if (mutex->sig != _PTHREAD_MUTEX_SIG)
+ {
+ if (mutex->sig != _PTHREAD_MUTEX_SIG_init)
+ {
+ if (mutex->sig == _PTHREAD_KERN_MUTEX_SIG) {
+ int mutexid = mutex->_pthread_mutex_kernid;
+ UNLOCK(mutex->lock);
+ if( __pthread_mutex_unlock(mutexid) == -1) {
+ PLOCKSTAT_MUTEX_ERROR(mutex, errno);
+ return(errno);
+ }
+ PLOCKSTAT_MUTEX_RELEASE(mutex, 0);
+ return(0);
+ } else {
+ PLOCKSTAT_MUTEX_ERROR(mutex, EINVAL);
+ UNLOCK(mutex->lock);
+ return (EINVAL);
+ }
+ }
+ _pthread_mutex_init(mutex, NULL);
+ } else
+
+#if !defined(DEBUG)
+ if (mutex->type != PTHREAD_MUTEX_NORMAL)
+#endif
+ {
+ pthread_t self = pthread_self();
+ if (mutex->owner != self)
+ {
+#if defined(DEBUG)
+ abort();
+#endif
+ PLOCKSTAT_MUTEX_ERROR(mutex, EPERM);
+ UNLOCK(mutex->lock);
+ return EPERM;
+ } else if (mutex->type == PTHREAD_MUTEX_RECURSIVE &&
+ --mutex->lock_count)
+ {
+ PLOCKSTAT_MUTEX_RELEASE(mutex, 1);
+ UNLOCK(mutex->lock);
+ return(0);
+ }
+ }
+
+ mutex->lock_count = 0;
+#if defined(DEBUG)
+ _pthread_mutex_remove(mutex, mutex->owner);
+#endif /* DEBUG */
+
+ waiters = mutex->waiters;
+ if (waiters)
+ {
+ mutex->owner = _PTHREAD_MUTEX_OWNER_SWITCHING;
+ PLOCKSTAT_MUTEX_RELEASE(mutex, 0);
+ UNLOCK(mutex->lock);
+ PTHREAD_MACH_CALL(semaphore_signal(mutex->sem), kern_res);
+ }
+ else
+ {
+ mutex->owner = (pthread_t)NULL;
+ PLOCKSTAT_MUTEX_RELEASE(mutex, 0);
+ UNLOCK(mutex->lock);
+ }
+ return (0);
+}
+
+/*
+ * Fetch the priority ceiling value from a mutex variable.
+ * Note: written as a 'helper' function to hide implementation details.
+ */
+int
+pthread_mutex_getprioceiling(const pthread_mutex_t *mutex,
+ int *prioceiling)
+{
+ int res;
+
+ LOCK(mutex->lock);
+ if (mutex->sig == _PTHREAD_MUTEX_SIG)
+ {
+ *prioceiling = mutex->prioceiling;
+ res = 0;
+ } else
+ res = EINVAL; /* Not an initialized 'attribute' structure */
+ UNLOCK(mutex->lock);
+ return (res);
+}
+
+/*
+ * Set the priority ceiling for a mutex.
+ * Note: written as a 'helper' function to hide implementation details.
+ */
+int
+pthread_mutex_setprioceiling(pthread_mutex_t *mutex,
+ int prioceiling,
+ int *old_prioceiling)
+{
+ int res;
+
+ LOCK(mutex->lock);
+ if (mutex->sig == _PTHREAD_MUTEX_SIG)
+ {
+ if ((prioceiling >= -999) ||
+ (prioceiling <= 999))
+ {
+ *old_prioceiling = mutex->prioceiling;
+ mutex->prioceiling = prioceiling;
+ res = 0;
+ } else
+ res = EINVAL; /* Invalid parameter */
+ } else
+ res = EINVAL; /* Not an initialized 'attribute' structure */
+ UNLOCK(mutex->lock);
+ return (res);
+}
+
+/*
+ * Get the priority ceiling value from a mutex attribute structure.
+ * Note: written as a 'helper' function to hide implementation details.
+ */
+int
+pthread_mutexattr_getprioceiling(const pthread_mutexattr_t *attr,
+ int *prioceiling)
+{
+ if (attr->sig == _PTHREAD_MUTEX_ATTR_SIG)
+ {
+ *prioceiling = attr->prioceiling;
+ return (0);
+ } else
+ {
+ return (EINVAL); /* Not an initialized 'attribute' structure */
+ }
+}
+
+/*
+ * Get the mutex 'protocol' value from a mutex attribute structure.
+ * Note: written as a 'helper' function to hide implementation details.
+ */
+int
+pthread_mutexattr_getprotocol(const pthread_mutexattr_t *attr,
+ int *protocol)
+{
+ if (attr->sig == _PTHREAD_MUTEX_ATTR_SIG)
+ {
+ *protocol = attr->protocol;
+ return (0);
+ } else
+ {
+ return (EINVAL); /* Not an initialized 'attribute' structure */
+ }
+}
+/*
+ * Get the mutex 'type' value from a mutex attribute structure.
+ * Note: written as a 'helper' function to hide implementation details.
+ */
+int
+pthread_mutexattr_gettype(const pthread_mutexattr_t *attr,
+ int *type)
+{
+ if (attr->sig == _PTHREAD_MUTEX_ATTR_SIG)
+ {
+ *type = attr->type;
+ return (0);
+ } else
+ {
+ return (EINVAL); /* Not an initialized 'attribute' structure */
+ }
+}
+
+/*
+ *
+ */
+int
+pthread_mutexattr_getpshared(const pthread_mutexattr_t *attr, int *pshared)
+{
+ if (attr->sig == _PTHREAD_MUTEX_ATTR_SIG)
+ {
+ *pshared = (int)attr->pshared;
+ return (0);
+ } else
+ {
+ return (EINVAL); /* Not an initialized 'attribute' structure */
+ }
+}
+
+/*
+ * Initialize a mutex attribute structure to system defaults.
+ */
+int
+pthread_mutexattr_init(pthread_mutexattr_t *attr)
+{
+ attr->prioceiling = _PTHREAD_DEFAULT_PRIOCEILING;
+ attr->protocol = _PTHREAD_DEFAULT_PROTOCOL;
+ attr->type = PTHREAD_MUTEX_DEFAULT;
+ attr->sig = _PTHREAD_MUTEX_ATTR_SIG;
+ attr->pshared = _PTHREAD_DEFAULT_PSHARED;
+ return (0);
+}
+
+/*
+ * Set the priority ceiling value in a mutex attribute structure.
+ * Note: written as a 'helper' function to hide implementation details.
+ */
+int
+pthread_mutexattr_setprioceiling(pthread_mutexattr_t *attr,
+ int prioceiling)
+{
+ if (attr->sig == _PTHREAD_MUTEX_ATTR_SIG)
+ {
+ if ((prioceiling >= -999) ||
+ (prioceiling <= 999))
+ {
+ attr->prioceiling = prioceiling;
+ return (0);
+ } else
+ {
+ return (EINVAL); /* Invalid parameter */
+ }
+ } else
+ {
+ return (EINVAL); /* Not an initialized 'attribute' structure */
+ }
+}
+
+/*
+ * Set the mutex 'protocol' value in a mutex attribute structure.
+ * Note: written as a 'helper' function to hide implementation details.
+ */
+int
+pthread_mutexattr_setprotocol(pthread_mutexattr_t *attr,
+ int protocol)
+{
+ if (attr->sig == _PTHREAD_MUTEX_ATTR_SIG)
+ {
+ if ((protocol == PTHREAD_PRIO_NONE) ||
+ (protocol == PTHREAD_PRIO_INHERIT) ||
+ (protocol == PTHREAD_PRIO_PROTECT))
+ {
+ attr->protocol = protocol;
+ return (0);
+ } else
+ {
+ return (EINVAL); /* Invalid parameter */
+ }
+ } else
+ {
+ return (EINVAL); /* Not an initialized 'attribute' structure */
+ }
+}
+/*
+ * Set the mutex 'type' value in a mutex attribute structure.
+ * Note: written as a 'helper' function to hide implementation details.
+ */
+int
+pthread_mutexattr_settype(pthread_mutexattr_t *attr,
+ int type)
+{
+ if (attr->sig == _PTHREAD_MUTEX_ATTR_SIG)
+ {
+ if ((type == PTHREAD_MUTEX_NORMAL) ||
+ (type == PTHREAD_MUTEX_ERRORCHECK) ||
+ (type == PTHREAD_MUTEX_RECURSIVE) ||
+ (type == PTHREAD_MUTEX_DEFAULT))
+ {
+ attr->type = type;
+ return (0);
+ } else
+ {
+ return (EINVAL); /* Invalid parameter */
+ }
+ } else
+ {
+ return (EINVAL); /* Not an initialized 'attribute' structure */
+ }
+}
+
+
+int mutex_try_lock(int *x) {
+ return _spin_lock_try((pthread_lock_t *)x);
+}
+
+void mutex_wait_lock(int *x) {
+ for (;;) {
+ if( _spin_lock_try((pthread_lock_t *)x)) {
+ return;
+ }
+ swtch_pri(0);
+ }
+}
+
+void
+cthread_yield(void)
+{
+ sched_yield();
+}
+
+void
+pthread_yield_np (void)
+{
+ sched_yield();
+}
+
+
+/*
+ * Temp: till pshared is fixed correctly
+ */
+int
+pthread_mutexattr_setpshared(pthread_mutexattr_t *attr, int pshared)
+{
+#if __DARWIN_UNIX03
+ if (__unix_conforming == 0)
+ __unix_conforming = 1;
+#endif /* __DARWIN_UNIX03 */
+
+ if (attr->sig == _PTHREAD_MUTEX_ATTR_SIG)
+ {
+#if __DARWIN_UNIX03
+#ifdef PR_5243343
+ if (( pshared == PTHREAD_PROCESS_PRIVATE) || (pshared == PTHREAD_PROCESS_SHARED && PR_5243343_flag))
+#else /* !PR_5243343 */
+ if (( pshared == PTHREAD_PROCESS_PRIVATE) || (pshared == PTHREAD_PROCESS_SHARED))
+#endif /* PR_5243343 */
+#else /* __DARWIN_UNIX03 */
+ if ( pshared == PTHREAD_PROCESS_PRIVATE)
+#endif /* __DARWIN_UNIX03 */
+ {
+ attr->pshared = pshared;
+ return (0);
+ } else
+ {
+ return (EINVAL); /* Invalid parameter */
+ }
+ } else
+ {
+ return (EINVAL); /* Not an initialized 'attribute' structure */
+ }
+}
+
+
+#endif /* !BUILDING_VARIANT ] */
+
+/*
+ * Destroy a mutex attribute structure.
+ */
+int
+pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
+{
+#if __DARWIN_UNIX03
+ if (__unix_conforming == 0)
+ __unix_conforming = 1;
+ if (attr->sig != _PTHREAD_MUTEX_ATTR_SIG)
+ return (EINVAL);
+#endif /* __DARWIN_UNIX03 */
+
+ attr->sig = _PTHREAD_NO_SIG; /* Uninitialized */
+ return (0);
+}
+
+