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/* Copyright (c) 2013, Linaro Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "config.h"
#include <odp/api/spinlock.h>
#include <odp/api/cpu.h>
#include <odp_atomic_internal.h>
void odp_spinlock_init(odp_spinlock_t *spinlock)
{
_odp_atomic_flag_init(&spinlock->lock, 0);
}
void odp_spinlock_lock(odp_spinlock_t *spinlock)
{
/* While the lock is already taken... */
while (_odp_atomic_flag_tas(&spinlock->lock))
/* ...spin reading the flag (relaxed MM),
* the loop will exit when the lock becomes available
* and we will retry the TAS operation above */
while (_odp_atomic_flag_load(&spinlock->lock))
odp_cpu_pause();
}
int odp_spinlock_trylock(odp_spinlock_t *spinlock)
{
return (_odp_atomic_flag_tas(&spinlock->lock) == 0);
}
void odp_spinlock_unlock(odp_spinlock_t *spinlock)
{
_odp_atomic_flag_clear(&spinlock->lock);
}
int odp_spinlock_is_locked(odp_spinlock_t *spinlock)
{
return _odp_atomic_flag_load(&spinlock->lock) != 0;
}
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