mirror of
https://github.com/koverstreet/bcachefs-tools.git
synced 2025-02-02 00:00:03 +03:00
29 lines
743 B
C
29 lines
743 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _BCACHEFS_TWO_STATE_LOCK_H
|
|
#define _BCACHEFS_TWO_STATE_LOCK_H
|
|
|
|
#include <linux/atomic.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/wait.h>
|
|
|
|
/*
|
|
* Two-state lock - can be taken for add or block - both states are shared,
|
|
* like read side of rwsem, but conflict with other state:
|
|
*/
|
|
typedef struct {
|
|
atomic_long_t v;
|
|
wait_queue_head_t wait;
|
|
} two_state_lock_t;
|
|
|
|
static inline void two_state_lock_init(two_state_lock_t *lock)
|
|
{
|
|
atomic_long_set(&lock->v, 0);
|
|
init_waitqueue_head(&lock->wait);
|
|
}
|
|
|
|
void bch2_two_state_unlock(two_state_lock_t *, int);
|
|
bool bch2_two_state_trylock(two_state_lock_t *, int);
|
|
void bch2_two_state_lock(two_state_lock_t *, int);
|
|
|
|
#endif /* _BCACHEFS_TWO_STATE_LOCK_H */
|