Differences From Artifact [cbacd2f77f]:
- File src/mutex.h — part of check-in [c7f0229795] at 2020-01-02 01:51:34 on branch trunk — Update copyright (user: js, size: 3996) [annotate] [blame] [check-ins using] [more...]
To Artifact [5c06ee482b]:
- File
src/mutex.h
— part of check-in
[5b37fbeb82]
at
2020-12-20 21:26:08
on branch trunk
— Return error instead of using errno for threading
errno is problematic for Amiga libraries and is also not thread-safe on
some systems, even though it should. (user: js, size: 3979) [annotate] [blame] [check-ins using] [more...]
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* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#include "objfw-defs.h"
#include "platform.h"
#if !defined(OF_HAVE_THREADS) || \
(!defined(OF_HAVE_PTHREADS) && !defined(OF_WINDOWS) && !defined(OF_AMIGAOS))
# error No mutexes available!
#endif
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* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#include "objfw-defs.h"
#include <errno.h>
#include "platform.h"
#if !defined(OF_HAVE_THREADS) || \
(!defined(OF_HAVE_PTHREADS) && !defined(OF_WINDOWS) && !defined(OF_AMIGAOS))
# error No mutexes available!
#endif
|
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of_tlskey_t count;
} of_rmutex_t;
#endif
#ifdef __cplusplus
extern "C" {
#endif
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of_tlskey_t count;
} of_rmutex_t;
#endif
#ifdef __cplusplus
extern "C" {
#endif
extern int of_mutex_new(of_mutex_t *mutex);
extern int of_mutex_lock(of_mutex_t *mutex);
extern int of_mutex_trylock(of_mutex_t *mutex);
extern int of_mutex_unlock(of_mutex_t *mutex);
extern int of_mutex_free(of_mutex_t *mutex);
extern int of_rmutex_new(of_rmutex_t *rmutex);
extern int of_rmutex_lock(of_rmutex_t *rmutex);
extern int of_rmutex_trylock(of_rmutex_t *rmutex);
extern int of_rmutex_unlock(of_rmutex_t *rmutex);
extern int of_rmutex_free(of_rmutex_t *rmutex);
#ifdef __cplusplus
}
#endif
/* Spinlocks are inlined for performance. */
static OF_INLINE void
of_thread_yield(void)
{
#if defined(OF_HAVE_SCHED_YIELD)
sched_yield();
#elif defined(OF_WINDOWS)
Sleep(0);
#endif
}
static OF_INLINE int
of_spinlock_new(of_spinlock_t *spinlock)
{
#if defined(OF_HAVE_ATOMIC_OPS)
*spinlock = 0;
return 0;
#elif defined(OF_HAVE_PTHREAD_SPINLOCKS)
return pthread_spin_init(spinlock, 0);
#else
return of_mutex_new(spinlock);
#endif
}
static OF_INLINE int
of_spinlock_trylock(of_spinlock_t *spinlock)
{
#if defined(OF_HAVE_ATOMIC_OPS)
if (of_atomic_int_cmpswap(spinlock, 0, 1)) {
of_memory_barrier_acquire();
return 0;
}
return EBUSY;
#elif defined(OF_HAVE_PTHREAD_SPINLOCKS)
return pthread_spin_trylock(spinlock);
#else
return of_mutex_trylock(spinlock);
#endif
}
static OF_INLINE int
of_spinlock_lock(of_spinlock_t *spinlock)
{
#if defined(OF_HAVE_ATOMIC_OPS)
size_t i;
for (i = 0; i < OF_SPINCOUNT; i++)
if (of_spinlock_trylock(spinlock) == 0)
return 0;
while (of_spinlock_trylock(spinlock) == EBUSY)
of_thread_yield();
return 0;
#elif defined(OF_HAVE_PTHREAD_SPINLOCKS)
return pthread_spin_lock(spinlock);
#else
return of_mutex_lock(spinlock);
#endif
}
static OF_INLINE int
of_spinlock_unlock(of_spinlock_t *spinlock)
{
#if defined(OF_HAVE_ATOMIC_OPS)
bool ret = of_atomic_int_cmpswap(spinlock, 1, 0);
of_memory_barrier_release();
return (ret ? 0 : EINVAL);
#elif defined(OF_HAVE_PTHREAD_SPINLOCKS)
return pthread_spin_unlock(spinlock);
#else
return of_mutex_unlock(spinlock);
#endif
}
static OF_INLINE int
of_spinlock_free(of_spinlock_t *spinlock)
{
#if defined(OF_HAVE_ATOMIC_OPS)
return 0;
#elif defined(OF_HAVE_PTHREAD_SPINLOCKS)
return pthread_spin_destroy(spinlock);
#else
return of_mutex_free(spinlock);
#endif
}
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