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/*
* Copyright 2018 The Hafnium Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __SAIL_SPINLOCK__
#define __SAIL_SPINLOCK__
#include <stdatomic.h>
struct sail_spinlock {
atomic_flag v;
};
#define SPINLOCK_INIT \
{ \
.v = ATOMIC_FLAG_INIT \
}
static inline void sail_spin_init(struct sail_spinlock *l)
{
*l = (struct sail_spinlock)SPINLOCK_INIT;
}
static inline void sail_spin_lock(struct sail_spinlock *l)
{
while (atomic_flag_test_and_set_explicit(&l->v, memory_order_acquire)) {
/* do nothing */
}
}
static inline void sail_spin_unlock(struct sail_spinlock *l)
{
atomic_flag_clear_explicit(&l->v, memory_order_release);
}
#endif
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