fb11e647
 vrobic
reseau statique a...
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/*
* Copyright (C) 2013 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup pthread
* @{
* @file
* @brief Spin locks.
* @author Christian Mehlis <mehlis@inf.fu-berlin.de>
* @author René Kijewski <kijewski@inf.fu-berlin.de>
* @author Joakim Nohlgård <joakim.nohlgard@eistec.se>
* @}
*/
#include "pthread.h"
#include "atomic.h"
int pthread_spin_init(pthread_spinlock_t *lock, int pshared)
{
if (lock == NULL) {
return EINVAL;
}
(void) pshared;
ATOMIC_VALUE(lock->value) = 0;
return 0;
}
int pthread_spin_destroy(pthread_spinlock_t *lock)
{
if (lock == NULL) {
return EINVAL;
}
(void) lock;
return 0;
}
int pthread_spin_lock(pthread_spinlock_t *lock)
{
if (lock == NULL) {
return EINVAL;
}
while (atomic_set_to_one(&(lock->value)) == 0) {
/* spin */
}
return 0;
}
int pthread_spin_trylock(pthread_spinlock_t *lock)
{
if (lock == NULL) {
return EINVAL;
}
if (atomic_set_to_one(&(lock->value)) == 0) {
return EBUSY;
}
return 0;
}
int pthread_spin_unlock(pthread_spinlock_t *lock)
{
if (lock == NULL) {
return EINVAL;
}
if (atomic_set_to_zero(&(lock->value)) == 0) {
return EPERM;
}
return 0;
}
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