관리-도구

편집 파일: osq_lock.h

/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __LINUX_OSQ_LOCK_H #define __LINUX_OSQ_LOCK_H /* * An MCS like lock especially tailored for optimistic spinning for sleeping * lock implementations (mutex, rwsem, etc). */ struct optimistic_spin_queue { /* * Stores an encoded value of the CPU # of the tail node in the queue. * If the queue is empty, then it's set to OSQ_UNLOCKED_VAL. */ atomic_t tail; }; #define OSQ_UNLOCKED_VAL (0) /* Init macro and function. */ #define OSQ_LOCK_UNLOCKED { ATOMIC_INIT(OSQ_UNLOCKED_VAL) } static inline void osq_lock_init(struct optimistic_spin_queue *lock) { atomic_set(&lock->tail, OSQ_UNLOCKED_VAL); } extern bool osq_lock(struct optimistic_spin_queue *lock); extern void osq_unlock(struct optimistic_spin_queue *lock); static inline bool osq_is_locked(struct optimistic_spin_queue *lock) { return atomic_read(&lock->tail) != OSQ_UNLOCKED_VAL; } #endif