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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright (c) 2013-2018 Linaro Limited
* Copyright (c) 2022 Nokia
*/
#ifndef ODP_PLAT_SPINLOCK_INLINES_H_
#define ODP_PLAT_SPINLOCK_INLINES_H_
#include <odp/api/cpu.h>
#include <odp/api/abi/spinlock.h>
/** @cond _ODP_HIDE_FROM_DOXYGEN_ */
#ifndef _ODP_NO_INLINE
/* Inline functions by default */
#define _ODP_INLINE static inline
#define odp_spinlock_init __odp_spinlock_init
#define odp_spinlock_lock __odp_spinlock_lock
#define odp_spinlock_trylock __odp_spinlock_trylock
#define odp_spinlock_unlock __odp_spinlock_unlock
#define odp_spinlock_is_locked __odp_spinlock_is_locked
#include <odp/api/plat/cpu_inlines.h>
#else
#undef _ODP_INLINE
#define _ODP_INLINE
#endif
_ODP_INLINE void odp_spinlock_init(odp_spinlock_t *spinlock)
{
__atomic_clear(&spinlock->lock, __ATOMIC_RELAXED);
}
_ODP_INLINE void odp_spinlock_lock(odp_spinlock_t *spinlock)
{
/* While the lock is already taken... */
while (__atomic_test_and_set(&spinlock->lock, __ATOMIC_ACQUIRE))
/* ...spin reading the flag (relaxed MM),
* the loop will exit when the lock becomes available
* and we will retry the TAS operation above */
while (__atomic_load_n(&spinlock->lock, __ATOMIC_RELAXED))
odp_cpu_pause();
}
_ODP_INLINE int odp_spinlock_trylock(odp_spinlock_t *spinlock)
{
return (__atomic_test_and_set(&spinlock->lock, __ATOMIC_ACQUIRE) == 0);
}
_ODP_INLINE void odp_spinlock_unlock(odp_spinlock_t *spinlock)
{
__atomic_clear(&spinlock->lock, __ATOMIC_RELEASE);
}
_ODP_INLINE int odp_spinlock_is_locked(odp_spinlock_t *spinlock)
{
return __atomic_load_n(&spinlock->lock, __ATOMIC_RELAXED) != 0;
}
/** @endcond */
#endif
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