Enrico Fraccaroli
34 lines
675 B
C
34 lines
675 B
C
/// @file spinlock.c
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/// @brief
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/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include "klib/spinlock.h"
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void spinlock_init(spinlock_t *spinlock)
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{
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(*spinlock) = SPINLOCK_FREE;
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}
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void spinlock_lock(spinlock_t *spinlock)
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{
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while (1) {
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if (atomic_set_and_test(spinlock, SPINLOCK_BUSY) == 0) {
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break;
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}
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while (*spinlock)
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cpu_relax();
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}
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}
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void spinlock_unlock(spinlock_t *spinlock)
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{
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barrier();
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atomic_set(spinlock, SPINLOCK_FREE);
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}
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int spinlock_trylock(spinlock_t *spinlock)
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{
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return atomic_set_and_test(spinlock, SPINLOCK_BUSY) == 0;
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}
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