/* Locking in multithreaded situations.
- Copyright (C) 2005 Free Software Foundation, Inc.
+ Copyright (C) 2005-2008 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify it
- under the terms of the GNU Library General Public License as published
- by the Free Software Foundation; either version 2, or (at your option)
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
- USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Written by Bruno Haible <bruno@clisp.org>, 2005.
Based on GCC's gthr-posix.h, gthr-posix95.h, gthr-solaris.h,
gthr-win32.h. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
#include "lock.h"
/* Use the POSIX threads library. */
+# if PTHREAD_IN_USE_DETECTION_HARD
+
+/* The function to be executed by a dummy thread. */
+static void *
+dummy_thread_func (void *arg)
+{
+ return arg;
+}
+
+int
+glthread_in_use (void)
+{
+ static int tested;
+ static int result; /* 1: linked with -lpthread, 0: only with libc */
+
+ if (!tested)
+ {
+ pthread_t thread;
+
+ if (pthread_create (&thread, NULL, dummy_thread_func, NULL) != 0)
+ /* Thread creation failed. */
+ result = 0;
+ else
+ {
+ /* Thread creation works. */
+ void *retval;
+ if (pthread_join (thread, &retval) != 0)
+ abort ();
+ result = 1;
+ }
+ tested = 1;
+ }
+ return result;
+}
+
+# endif
+
/* -------------------------- gl_lock_t datatype -------------------------- */
/* ------------------------- gl_rwlock_t datatype ------------------------- */
# if !defined PTHREAD_RWLOCK_INITIALIZER
-void
-glthread_rwlock_init (gl_rwlock_t *lock)
+int
+glthread_rwlock_init_multithreaded (gl_rwlock_t *lock)
{
- if (pthread_rwlock_init (&lock->rwlock, NULL) != 0)
- abort ();
+ int err;
+
+ err = pthread_rwlock_init (&lock->rwlock, NULL);
+ if (err != 0)
+ return err;
lock->initialized = 1;
+ return 0;
}
-void
-glthread_rwlock_rdlock (gl_rwlock_t *lock)
+int
+glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock)
{
if (!lock->initialized)
{
- if (pthread_mutex_lock (&lock->guard) != 0)
- abort ();
+ int err;
+
+ err = pthread_mutex_lock (&lock->guard);
+ if (err != 0)
+ return err;
if (!lock->initialized)
- glthread_rwlock_init (lock);
- if (pthread_mutex_unlock (&lock->guard) != 0)
- abort ();
+ {
+ err = glthread_rwlock_init_multithreaded (lock);
+ if (err != 0)
+ {
+ pthread_mutex_unlock (&lock->guard);
+ return err;
+ }
+ }
+ err = pthread_mutex_unlock (&lock->guard);
+ if (err != 0)
+ return err;
}
- if (pthread_rwlock_rdlock (&lock->rwlock) != 0)
- abort ();
+ return pthread_rwlock_rdlock (&lock->rwlock);
}
-void
-glthread_rwlock_wrlock (gl_rwlock_t *lock)
+int
+glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock)
{
if (!lock->initialized)
{
- if (pthread_mutex_lock (&lock->guard) != 0)
- abort ();
+ int err;
+
+ err = pthread_mutex_lock (&lock->guard);
+ if (err != 0)
+ return err;
if (!lock->initialized)
- glthread_rwlock_init (lock);
- if (pthread_mutex_unlock (&lock->guard) != 0)
- abort ();
+ {
+ err = glthread_rwlock_init_multithreaded (lock);
+ if (err != 0)
+ {
+ pthread_mutex_unlock (&lock->guard);
+ return err;
+ }
+ }
+ err = pthread_mutex_unlock (&lock->guard);
+ if (err != 0)
+ return err;
}
- if (pthread_rwlock_wrlock (&lock->rwlock) != 0)
- abort ();
+ return pthread_rwlock_wrlock (&lock->rwlock);
}
-void
-glthread_rwlock_unlock (gl_rwlock_t *lock)
+int
+glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock)
{
if (!lock->initialized)
- abort ();
- if (pthread_rwlock_unlock (&lock->rwlock) != 0)
- abort ();
+ return EINVAL;
+ return pthread_rwlock_unlock (&lock->rwlock);
}
-void
-glthread_rwlock_destroy (gl_rwlock_t *lock)
+int
+glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock)
{
+ int err;
+
if (!lock->initialized)
- abort ();
- if (pthread_rwlock_destroy (&lock->rwlock) != 0)
- abort ();
+ return EINVAL;
+ err = pthread_rwlock_destroy (&lock->rwlock);
+ if (err != 0)
+ return err;
lock->initialized = 0;
+ return 0;
}
# endif
# else
-void
-glthread_rwlock_init (gl_rwlock_t *lock)
-{
- if (pthread_mutex_init (&lock->lock, NULL) != 0)
- abort ();
- if (pthread_cond_init (&lock->waiting_readers, NULL) != 0)
- abort ();
- if (pthread_cond_init (&lock->waiting_writers, NULL) != 0)
- abort ();
+int
+glthread_rwlock_init_multithreaded (gl_rwlock_t *lock)
+{
+ int err;
+
+ err = pthread_mutex_init (&lock->lock, NULL);
+ if (err != 0)
+ return err;
+ err = pthread_cond_init (&lock->waiting_readers, NULL);
+ if (err != 0)
+ return err;
+ err = pthread_cond_init (&lock->waiting_writers, NULL);
+ if (err != 0)
+ return err;
lock->waiting_writers_count = 0;
lock->runcount = 0;
+ return 0;
}
-void
-glthread_rwlock_rdlock (gl_rwlock_t *lock)
+int
+glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock)
{
- if (pthread_mutex_lock (&lock->lock) != 0)
- abort ();
+ int err;
+
+ err = pthread_mutex_lock (&lock->lock);
+ if (err != 0)
+ return err;
/* Test whether only readers are currently running, and whether the runcount
field will not overflow. */
/* POSIX says: "It is implementation-defined whether the calling thread
{
/* This thread has to wait for a while. Enqueue it among the
waiting_readers. */
- if (pthread_cond_wait (&lock->waiting_readers, &lock->lock) != 0)
- abort ();
+ err = pthread_cond_wait (&lock->waiting_readers, &lock->lock);
+ if (err != 0)
+ {
+ pthread_mutex_unlock (&lock->lock);
+ return err;
+ }
}
lock->runcount++;
- if (pthread_mutex_unlock (&lock->lock) != 0)
- abort ();
+ return pthread_mutex_unlock (&lock->lock);
}
-void
-glthread_rwlock_wrlock (gl_rwlock_t *lock)
+int
+glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock)
{
- if (pthread_mutex_lock (&lock->lock) != 0)
- abort ();
+ int err;
+
+ err = pthread_mutex_lock (&lock->lock);
+ if (err != 0)
+ return err;
/* Test whether no readers or writers are currently running. */
while (!(lock->runcount == 0))
{
/* This thread has to wait for a while. Enqueue it among the
waiting_writers. */
lock->waiting_writers_count++;
- if (pthread_cond_wait (&lock->waiting_writers, &lock->lock) != 0)
- abort ();
+ err = pthread_cond_wait (&lock->waiting_writers, &lock->lock);
+ if (err != 0)
+ {
+ lock->waiting_writers_count--;
+ pthread_mutex_unlock (&lock->lock);
+ return err;
+ }
lock->waiting_writers_count--;
}
lock->runcount--; /* runcount becomes -1 */
- if (pthread_mutex_unlock (&lock->lock) != 0)
- abort ();
+ return pthread_mutex_unlock (&lock->lock);
}
-void
-glthread_rwlock_unlock (gl_rwlock_t *lock)
+int
+glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock)
{
- if (pthread_mutex_lock (&lock->lock) != 0)
- abort ();
+ int err;
+
+ err = pthread_mutex_lock (&lock->lock);
+ if (err != 0)
+ return err;
if (lock->runcount < 0)
{
/* Drop a writer lock. */
if (!(lock->runcount == -1))
- abort ();
+ {
+ pthread_mutex_unlock (&lock->lock);
+ return EINVAL;
+ }
lock->runcount = 0;
}
else
{
/* Drop a reader lock. */
if (!(lock->runcount > 0))
- abort ();
+ {
+ pthread_mutex_unlock (&lock->lock);
+ return EINVAL;
+ }
lock->runcount--;
}
if (lock->runcount == 0)
if (lock->waiting_writers_count > 0)
{
/* Wake up one of the waiting writers. */
- if (pthread_cond_signal (&lock->waiting_writers) != 0)
- abort ();
+ err = pthread_cond_signal (&lock->waiting_writers);
+ if (err != 0)
+ {
+ pthread_mutex_unlock (&lock->lock);
+ return err;
+ }
}
else
{
/* Wake up all waiting readers. */
- if (pthread_cond_broadcast (&lock->waiting_readers) != 0)
- abort ();
+ err = pthread_cond_broadcast (&lock->waiting_readers);
+ if (err != 0)
+ {
+ pthread_mutex_unlock (&lock->lock);
+ return err;
+ }
}
}
- if (pthread_mutex_unlock (&lock->lock) != 0)
- abort ();
+ return pthread_mutex_unlock (&lock->lock);
}
-void
-glthread_rwlock_destroy (gl_rwlock_t *lock)
+int
+glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock)
{
- if (pthread_mutex_destroy (&lock->lock) != 0)
- abort ();
- if (pthread_cond_destroy (&lock->waiting_readers) != 0)
- abort ();
- if (pthread_cond_destroy (&lock->waiting_writers) != 0)
- abort ();
+ int err;
+
+ err = pthread_mutex_destroy (&lock->lock);
+ if (err != 0)
+ return err;
+ err = pthread_cond_destroy (&lock->waiting_readers);
+ if (err != 0)
+ return err;
+ err = pthread_cond_destroy (&lock->waiting_writers);
+ if (err != 0)
+ return err;
+ return 0;
}
# endif
# if HAVE_PTHREAD_MUTEX_RECURSIVE
-# if !(defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER || defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
+# if defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER || defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
-void
-glthread_recursive_lock_init (gl_recursive_lock_t *lock)
+int
+glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock)
+{
+ pthread_mutexattr_t attributes;
+ int err;
+
+ err = pthread_mutexattr_init (&attributes);
+ if (err != 0)
+ return err;
+ err = pthread_mutexattr_settype (&attributes, PTHREAD_MUTEX_RECURSIVE);
+ if (err != 0)
+ {
+ pthread_mutexattr_destroy (&attributes);
+ return err;
+ }
+ err = pthread_mutex_init (lock, &attributes);
+ if (err != 0)
+ {
+ pthread_mutexattr_destroy (&attributes);
+ return err;
+ }
+ err = pthread_mutexattr_destroy (&attributes);
+ if (err != 0)
+ return err;
+ return 0;
+}
+
+# else
+
+int
+glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock)
{
pthread_mutexattr_t attributes;
+ int err;
- if (pthread_mutexattr_init (&attributes) != 0)
- abort ();
- if (pthread_mutexattr_settype (&attributes, PTHREAD_MUTEX_RECURSIVE) != 0)
- abort ();
- if (pthread_mutex_init (&lock->recmutex, &attributes) != 0)
- abort ();
- if (pthread_mutexattr_destroy (&attributes) != 0)
- abort ();
+ err = pthread_mutexattr_init (&attributes);
+ if (err != 0)
+ return err;
+ err = pthread_mutexattr_settype (&attributes, PTHREAD_MUTEX_RECURSIVE);
+ if (err != 0)
+ {
+ pthread_mutexattr_destroy (&attributes);
+ return err;
+ }
+ err = pthread_mutex_init (&lock->recmutex, &attributes);
+ if (err != 0)
+ {
+ pthread_mutexattr_destroy (&attributes);
+ return err;
+ }
+ err = pthread_mutexattr_destroy (&attributes);
+ if (err != 0)
+ return err;
lock->initialized = 1;
+ return 0;
}
-void
-glthread_recursive_lock_lock (gl_recursive_lock_t *lock)
+int
+glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock)
{
if (!lock->initialized)
{
- if (pthread_mutex_lock (&lock->guard) != 0)
- abort ();
+ int err;
+
+ err = pthread_mutex_lock (&lock->guard);
+ if (err != 0)
+ return err;
if (!lock->initialized)
- glthread_recursive_lock_init (lock);
- if (pthread_mutex_unlock (&lock->guard) != 0)
- abort ();
+ {
+ err = glthread_recursive_lock_init_multithreaded (lock);
+ if (err != 0)
+ {
+ pthread_mutex_unlock (&lock->guard);
+ return err;
+ }
+ }
+ err = pthread_mutex_unlock (&lock->guard);
+ if (err != 0)
+ return err;
}
- if (pthread_mutex_lock (&lock->recmutex) != 0)
- abort ();
+ return pthread_mutex_lock (&lock->recmutex);
}
-void
-glthread_recursive_lock_unlock (gl_recursive_lock_t *lock)
+int
+glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock)
{
if (!lock->initialized)
- abort ();
- if (pthread_mutex_unlock (&lock->recmutex) != 0)
- abort ();
+ return EINVAL;
+ return pthread_mutex_unlock (&lock->recmutex);
}
-void
-glthread_recursive_lock_destroy (gl_recursive_lock_t *lock)
+int
+glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock)
{
+ int err;
+
if (!lock->initialized)
- abort ();
- if (pthread_mutex_destroy (&lock->recmutex) != 0)
- abort ();
+ return EINVAL;
+ err = pthread_mutex_destroy (&lock->recmutex);
+ if (err != 0)
+ return err;
lock->initialized = 0;
+ return 0;
}
# endif
# else
-void
-glthread_recursive_lock_init (gl_recursive_lock_t *lock)
+int
+glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock)
{
- if (pthread_mutex_init (&lock->mutex, NULL) != 0)
- abort ();
+ int err;
+
+ err = pthread_mutex_init (&lock->mutex, NULL);
+ if (err != 0)
+ return err;
lock->owner = (pthread_t) 0;
lock->depth = 0;
+ return 0;
}
-void
-glthread_recursive_lock_lock (gl_recursive_lock_t *lock)
+int
+glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock)
{
pthread_t self = pthread_self ();
if (lock->owner != self)
{
- if (pthread_mutex_lock (&lock->mutex) != 0)
- abort ();
+ int err;
+
+ err = pthread_mutex_lock (&lock->mutex);
+ if (err != 0)
+ return err;
lock->owner = self;
}
if (++(lock->depth) == 0) /* wraparound? */
- abort ();
+ {
+ lock->depth--;
+ return EAGAIN;
+ }
+ return 0;
}
-void
-glthread_recursive_lock_unlock (gl_recursive_lock_t *lock)
+int
+glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock)
{
if (lock->owner != pthread_self ())
- abort ();
+ return EPERM;
if (lock->depth == 0)
- abort ();
+ return EINVAL;
if (--(lock->depth) == 0)
{
lock->owner = (pthread_t) 0;
- if (pthread_mutex_unlock (&lock->mutex) != 0)
- abort ();
+ return pthread_mutex_unlock (&lock->mutex);
}
+ else
+ return 0;
}
-void
-glthread_recursive_lock_destroy (gl_recursive_lock_t *lock)
+int
+glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock)
{
if (lock->owner != (pthread_t) 0)
- abort ();
- if (pthread_mutex_destroy (&lock->mutex) != 0)
- abort ();
+ return EBUSY;
+ return (pthread_mutex_destroy (&lock->mutex);
}
# endif
/* -------------------------- gl_once_t datatype -------------------------- */
-void
+static void
glthread_once_call (void *arg)
{
void (**gl_once_temp_addr) (void) = (void (**) (void)) arg;
}
int
+glthread_once_multithreaded (pth_once_t *once_control, void (*initfunction) (void))
+{
+ void (*temp) (void) = initfunction;
+ return (!pth_once (once_control, glthread_once_call, &temp) ? errno : 0);
+}
+
+int
glthread_once_singlethreaded (pth_once_t *once_control)
{
/* We know that pth_once_t is an integer type. */
/* --------------------- gl_recursive_lock_t datatype --------------------- */
-void
-glthread_recursive_lock_init (gl_recursive_lock_t *lock)
+int
+glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock)
{
- if (mutex_init (&lock->mutex, USYNC_THREAD, NULL) != 0)
- abort ();
+ int err;
+
+ err = mutex_init (&lock->mutex, USYNC_THREAD, NULL);
+ if (err != 0)
+ return err;
lock->owner = (thread_t) 0;
lock->depth = 0;
+ return 0;
}
-void
-glthread_recursive_lock_lock (gl_recursive_lock_t *lock)
+int
+glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock)
{
thread_t self = thr_self ();
if (lock->owner != self)
{
- if (mutex_lock (&lock->mutex) != 0)
- abort ();
+ int err;
+
+ err = mutex_lock (&lock->mutex);
+ if (err != 0)
+ return err;
lock->owner = self;
}
if (++(lock->depth) == 0) /* wraparound? */
- abort ();
+ {
+ lock->depth--;
+ return EAGAIN;
+ }
+ return 0;
}
-void
-glthread_recursive_lock_unlock (gl_recursive_lock_t *lock)
+int
+glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock)
{
if (lock->owner != thr_self ())
- abort ();
+ return EPERM;
if (lock->depth == 0)
- abort ();
+ return EINVAL;
if (--(lock->depth) == 0)
{
lock->owner = (thread_t) 0;
- if (mutex_unlock (&lock->mutex) != 0)
- abort ();
+ return mutex_unlock (&lock->mutex);
}
+ else
+ return 0;
}
-void
-glthread_recursive_lock_destroy (gl_recursive_lock_t *lock)
+int
+glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock)
{
if (lock->owner != (thread_t) 0)
- abort ();
- if (mutex_destroy (&lock->mutex) != 0)
- abort ();
+ return EBUSY;
+ return mutex_destroy (&lock->mutex);
}
/* -------------------------- gl_once_t datatype -------------------------- */
-void
-glthread_once (gl_once_t *once_control, void (*initfunction) (void))
+int
+glthread_once_multithreaded (gl_once_t *once_control, void (*initfunction) (void))
{
if (!once_control->inited)
{
+ int err;
+
/* Use the mutex to guarantee that if another thread is already calling
the initfunction, this thread waits until it's finished. */
- if (mutex_lock (&once_control->mutex) != 0)
- abort ();
+ err = mutex_lock (&once_control->mutex);
+ if (err != 0)
+ return err;
if (!once_control->inited)
{
once_control->inited = 1;
initfunction ();
}
- if (mutex_unlock (&once_control->mutex) != 0)
- abort ();
+ return mutex_unlock (&once_control->mutex);
}
+ else
+ return 0;
}
int
/* -------------------------- gl_lock_t datatype -------------------------- */
void
-glthread_lock_init (gl_lock_t *lock)
+glthread_lock_init_func (gl_lock_t *lock)
{
InitializeCriticalSection (&lock->lock);
lock->guard.done = 1;
}
-void
+int
glthread_lock_lock (gl_lock_t *lock)
{
if (!lock->guard.done)
Sleep (0);
}
EnterCriticalSection (&lock->lock);
+ return 0;
}
-void
+int
glthread_lock_unlock (gl_lock_t *lock)
{
if (!lock->guard.done)
- abort ();
+ return EINVAL;
LeaveCriticalSection (&lock->lock);
+ return 0;
}
-void
+int
glthread_lock_destroy (gl_lock_t *lock)
{
if (!lock->guard.done)
- abort ();
+ return EINVAL;
DeleteCriticalSection (&lock->lock);
lock->guard.done = 0;
+ return 0;
}
/* ------------------------- gl_rwlock_t datatype ------------------------- */
}
void
-glthread_rwlock_init (gl_rwlock_t *lock)
+glthread_rwlock_init_func (gl_rwlock_t *lock)
{
InitializeCriticalSection (&lock->lock);
gl_waitqueue_init (&lock->waiting_readers);
lock->guard.done = 1;
}
-void
+int
glthread_rwlock_rdlock (gl_rwlock_t *lock)
{
if (!lock->guard.done)
removed us from the waiting_readers, incremented lock->runcount. */
if (!(lock->runcount > 0))
abort ();
- return;
+ return 0;
}
else
{
}
lock->runcount++;
LeaveCriticalSection (&lock->lock);
+ return 0;
}
-void
+int
glthread_rwlock_wrlock (gl_rwlock_t *lock)
{
if (!lock->guard.done)
removed us from the waiting_writers, set lock->runcount = -1. */
if (!(lock->runcount == -1))
abort ();
- return;
+ return 0;
}
else
{
}
lock->runcount--; /* runcount becomes -1 */
LeaveCriticalSection (&lock->lock);
+ return 0;
}
-void
+int
glthread_rwlock_unlock (gl_rwlock_t *lock)
{
if (!lock->guard.done)
- abort ();
+ return EINVAL;
EnterCriticalSection (&lock->lock);
if (lock->runcount < 0)
{
{
/* Drop a reader lock. */
if (!(lock->runcount > 0))
- abort ();
+ {
+ LeaveCriticalSection (&lock->lock);
+ return EPERM;
+ }
lock->runcount--;
}
if (lock->runcount == 0)
}
}
LeaveCriticalSection (&lock->lock);
+ return 0;
}
-void
+int
glthread_rwlock_destroy (gl_rwlock_t *lock)
{
if (!lock->guard.done)
- abort ();
+ return EINVAL;
if (lock->runcount != 0)
- abort ();
+ return EBUSY;
DeleteCriticalSection (&lock->lock);
if (lock->waiting_readers.array != NULL)
free (lock->waiting_readers.array);
if (lock->waiting_writers.array != NULL)
free (lock->waiting_writers.array);
lock->guard.done = 0;
+ return 0;
}
/* --------------------- gl_recursive_lock_t datatype --------------------- */
void
-glthread_recursive_lock_init (gl_recursive_lock_t *lock)
+glthread_recursive_lock_init_func (gl_recursive_lock_t *lock)
{
lock->owner = 0;
lock->depth = 0;
lock->guard.done = 1;
}
-void
+int
glthread_recursive_lock_lock (gl_recursive_lock_t *lock)
{
if (!lock->guard.done)
lock->owner = self;
}
if (++(lock->depth) == 0) /* wraparound? */
- abort ();
+ {
+ lock->depth--;
+ return EAGAIN;
+ }
}
+ return 0;
}
-void
+int
glthread_recursive_lock_unlock (gl_recursive_lock_t *lock)
{
if (lock->owner != GetCurrentThreadId ())
- abort ();
+ return EPERM;
if (lock->depth == 0)
- abort ();
+ return EINVAL;
if (--(lock->depth) == 0)
{
lock->owner = 0;
LeaveCriticalSection (&lock->lock);
}
+ return 0;
}
-void
+int
glthread_recursive_lock_destroy (gl_recursive_lock_t *lock)
{
if (lock->owner != 0)
- abort ();
+ return EBUSY;
DeleteCriticalSection (&lock->lock);
lock->guard.done = 0;
+ return 0;
}
/* -------------------------- gl_once_t datatype -------------------------- */
void
-glthread_once (gl_once_t *once_control, void (*initfunction) (void))
+glthread_once_func (gl_once_t *once_control, void (*initfunction) (void))
{
if (once_control->inited <= 0)
{
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