23 lines
497 B
C
23 lines
497 B
C
// SPDX-License-Identifier: ISC
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#pragma once
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#include <stdint.h>
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// Busy-waits in a loop until the lock is freed.
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// Does not put the CPU to sleep.
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struct spinlock {
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_Atomic(uint32_t) owner;
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_Atomic(uint32_t) next;
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};
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void spin_init(struct spinlock* spin);
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// Attempts to lock a spinlock. If it's already locked, waits until it's freed.
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void spin_lock(struct spinlock* spin);
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bool spin_trylock(struct spinlock* spin);
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// Unlocks a spinlock.
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void spin_unlock(struct spinlock* spin);
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