a752c7ab
 elopes
add first test an...
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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 <stdint.h>
#include <stdatomic.h>
#include <errno.h>
#include "pthread.h"
int pthread_spin_init(pthread_spinlock_t *lock, int pshared)
{
if (lock == NULL) {
return EINVAL;
}
(void) pshared;
atomic_flag_clear(&(lock->flag));
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_flag_test_and_set(&(lock->flag))) {
/* spin */
}
return 0;
}
int pthread_spin_trylock(pthread_spinlock_t *lock)
{
if (lock == NULL) {
return EINVAL;
}
if (atomic_flag_test_and_set(&(lock->flag))) {
return EBUSY;
}
return 0;
}
int pthread_spin_unlock(pthread_spinlock_t *lock)
{
if (lock == NULL) {
return EINVAL;
}
atomic_flag_clear(&(lock->flag));
return 0;
}
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