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1 | #ifndef __LINUX_SPINLOCK_UP_H |
2 | #define __LINUX_SPINLOCK_UP_H |
3 | |
4 | #ifndef __LINUX_SPINLOCK_H |
5 | # error "please don't include this file directly" |
6 | #endif |
7 | |
8 | /* |
9 | * include/linux/spinlock_up.h - UP-debug version of spinlocks. |
10 | * |
11 | * portions Copyright 2005, Red Hat, Inc., Ingo Molnar |
12 | * Released under the General Public License (GPL). |
13 | * |
14 | * In the debug case, 1 means unlocked, 0 means locked. (the values |
15 | * are inverted, to catch initialization bugs) |
16 | * |
17 | * No atomicity anywhere, we are on UP. |
18 | */ |
19 | |
20 | #ifdef CONFIG_DEBUG_SPINLOCK |
21 | #define arch_spin_is_locked(x) ((x)->slock == 0) |
22 | |
23 | static inline void arch_spin_lock(arch_spinlock_t *lock) |
24 | { |
25 | lock->slock = 0; |
26 | } |
27 | |
28 | static inline void |
29 | arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags) |
30 | { |
31 | local_irq_save(flags); |
32 | lock->slock = 0; |
33 | } |
34 | |
35 | static inline int arch_spin_trylock(arch_spinlock_t *lock) |
36 | { |
37 | char oldval = lock->slock; |
38 | |
39 | lock->slock = 0; |
40 | |
41 | return oldval > 0; |
42 | } |
43 | |
44 | static inline void arch_spin_unlock(arch_spinlock_t *lock) |
45 | { |
46 | lock->slock = 1; |
47 | } |
48 | |
49 | /* |
50 | * Read-write spinlocks. No debug version. |
51 | */ |
52 | #define arch_read_lock(lock) do { (void)(lock); } while (0) |
53 | #define arch_write_lock(lock) do { (void)(lock); } while (0) |
54 | #define arch_read_trylock(lock) ({ (void)(lock); 1; }) |
55 | #define arch_write_trylock(lock) ({ (void)(lock); 1; }) |
56 | #define arch_read_unlock(lock) do { (void)(lock); } while (0) |
57 | #define arch_write_unlock(lock) do { (void)(lock); } while (0) |
58 | |
59 | #else /* DEBUG_SPINLOCK */ |
60 | #define arch_spin_is_locked(lock) ((void)(lock), 0) |
61 | /* for sched.c and kernel_lock.c: */ |
62 | # define arch_spin_lock(lock) do { (void)(lock); } while (0) |
63 | # define arch_spin_lock_flags(lock, flags) do { (void)(lock); } while (0) |
64 | # define arch_spin_unlock(lock) do { (void)(lock); } while (0) |
65 | # define arch_spin_trylock(lock) ({ (void)(lock); 1; }) |
66 | #endif /* DEBUG_SPINLOCK */ |
67 | |
68 | #define arch_spin_is_contended(lock) (((void)(lock), 0)) |
69 | |
70 | #define arch_read_can_lock(lock) (((void)(lock), 1)) |
71 | #define arch_write_can_lock(lock) (((void)(lock), 1)) |
72 | |
73 | #define arch_spin_unlock_wait(lock) \ |
74 | do { cpu_relax(); } while (arch_spin_is_locked(lock)) |
75 | |
76 | #endif /* __LINUX_SPINLOCK_UP_H */ |
77 |
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