blob: 327b4927a8984b3d94b1dd2f7b91cb55bb973bb4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
#ifndef __ASM_SPINLOCK_H
#define __ASM_SPINLOCK_H
/* Simple spin lock operations. There are two variants, one clears IRQ's
* on the local processor, one does not.
*
* We make no fairness assumptions. They have a cost.
*/
typedef struct {
volatile unsigned long lock;
volatile unsigned long owner_pc;
volatile unsigned long owner_cpu;
} spinlock_t;
#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0, 0, 0 }
#define spin_lock_init(lp) do { (lp)->lock = 0; } while(0)
#define spin_unlock_wait(lp) do { barrier(); } while((lp)->lock)
extern void _spin_lock(spinlock_t *lock);
extern void _spin_unlock(spinlock_t *lock);
extern int spin_trylock(spinlock_t *lock);
#define spin_lock(lp) _spin_lock(lp)
#define spin_unlock(lp) _spin_unlock(lp)
#define spin_lock_irq(lock) \
do { __cli(); spin_lock(lock); } while (0)
#define spin_lock_bh(___lk) do { local_bh_disable(); spin_lock(___lk); } while(0)
#define spin_unlock_irq(lock) \
do { spin_unlock(lock); __sti(); } while (0)
#define spin_unlock_bh(___lk) do { spin_unlock(___lk); local_bh_enable(); } while(0)
#define spin_lock_irqsave(lock, flags) \
do { __save_flags(flags); __cli(); spin_lock(lock); } while (0)
#define spin_unlock_irqrestore(lock, flags) \
do { spin_unlock(lock); __restore_flags(flags); } while (0)
extern unsigned long __spin_trylock(volatile unsigned long *lock);
/*
* Read-write spinlocks, allowing multiple readers
* but only one writer.
*
* NOTE! it is quite common to have readers in interrupts
* but no interrupt writers. For those circumstances we
* can "mix" irq-safe locks - any writer needs to get a
* irq-safe write-lock, but readers can get non-irqsafe
* read-locks.
*/
typedef struct {
volatile unsigned long lock;
volatile unsigned long owner_pc;
} rwlock_t;
#define RW_LOCK_UNLOCKED (rwlock_t) { 0, 0 }
extern void _read_lock(rwlock_t *rw);
extern void _read_unlock(rwlock_t *rw);
extern void _write_lock(rwlock_t *rw);
extern void _write_unlock(rwlock_t *rw);
#define read_lock(rw) _read_lock(rw)
#define write_lock(rw) _write_lock(rw)
#define write_unlock(rw) _write_unlock(rw)
#define read_unlock(rw) _read_unlock(rw)
#endif /* __ASM_SPINLOCK_H */
|
