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#ifndef APOS_LOCK_H
#define APOS_LOCK_H
/**
* @file lock.h
* Atomic locks, currently only \ref spin_lock and \ref spin_unlock. Mutex is
* probably overkill for this project.
*/
#include <apos/atomic.h>
#include <apos/irq.h>
typedef atomic_int spinlock_t;
#include <lock.h>
static inline void spin_lock(spinlock_t *lck)
{
disable_irq();
do {
while (atomic_load_explicit(lck, memory_order_acquire))
optional_pause();
} while (atomic_exchange_explicit(lck, 1, memory_order_acq_rel));
}
static inline void spin_unlock(spinlock_t *lck)
{
atomic_store_explicit(lck, 0, memory_order_release);
enable_irq();
}
#endif /* APOS_LOCK_H */
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