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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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12345678910111213141516171819202122232425262728293031323334353637/* 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