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| Rev | Author | Line No. | Line |
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| 1408 | serge | 1 | #ifndef __LINUX_SPINLOCK_UP_H |
| 2 | #define __LINUX_SPINLOCK_UP_H |
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| 3 | |||
| 4 | #ifndef __LINUX_SPINLOCK_H |
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| 5 | # error "please don't include this file directly" |
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| 6 | #endif |
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| 7 | |||
| 8 | /* |
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| 9 | * include/linux/spinlock_up.h - UP-debug version of spinlocks. |
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| 10 | * |
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| 11 | * portions Copyright 2005, Red Hat, Inc., Ingo Molnar |
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| 12 | * Released under the General Public License (GPL). |
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| 13 | * |
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| 14 | * In the debug case, 1 means unlocked, 0 means locked. (the values |
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| 15 | * are inverted, to catch initialization bugs) |
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| 16 | * |
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| 17 | * No atomicity anywhere, we are on UP. |
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| 18 | */ |
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| 19 | |||
| 20 | #ifdef CONFIG_DEBUG_SPINLOCK |
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| 21 | #define __raw_spin_is_locked(x) ((x)->slock == 0) |
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| 22 | |||
| 23 | static inline void __raw_spin_lock(raw_spinlock_t *lock) |
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| 24 | { |
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| 25 | lock->slock = 0; |
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| 26 | } |
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| 27 | |||
| 28 | static inline void |
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| 29 | __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags) |
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| 30 | { |
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| 31 | local_irq_save(flags); |
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| 32 | lock->slock = 0; |
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| 33 | } |
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| 34 | |||
| 35 | static inline int __raw_spin_trylock(raw_spinlock_t *lock) |
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| 36 | { |
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| 37 | char oldval = lock->slock; |
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| 38 | |||
| 39 | lock->slock = 0; |
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| 40 | |||
| 41 | return oldval > 0; |
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| 42 | } |
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| 43 | |||
| 44 | static inline void __raw_spin_unlock(raw_spinlock_t *lock) |
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| 45 | { |
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| 46 | lock->slock = 1; |
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| 47 | } |
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| 48 | |||
| 49 | /* |
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| 50 | * Read-write spinlocks. No debug version. |
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| 51 | */ |
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| 52 | #define __raw_read_lock(lock) do { (void)(lock); } while (0) |
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| 53 | #define __raw_write_lock(lock) do { (void)(lock); } while (0) |
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| 54 | #define __raw_read_trylock(lock) ({ (void)(lock); 1; }) |
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| 55 | #define __raw_write_trylock(lock) ({ (void)(lock); 1; }) |
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| 56 | #define __raw_read_unlock(lock) do { (void)(lock); } while (0) |
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| 57 | #define __raw_write_unlock(lock) do { (void)(lock); } while (0) |
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| 58 | |||
| 59 | #else /* DEBUG_SPINLOCK */ |
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| 60 | #define __raw_spin_is_locked(lock) ((void)(lock), 0) |
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| 61 | /* for sched.c and kernel_lock.c: */ |
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| 62 | # define __raw_spin_lock(lock) do { (void)(lock); } while (0) |
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| 63 | # define __raw_spin_lock_flags(lock, flags) do { (void)(lock); } while (0) |
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| 64 | # define __raw_spin_unlock(lock) do { (void)(lock); } while (0) |
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| 65 | # define __raw_spin_trylock(lock) ({ (void)(lock); 1; }) |
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| 66 | #endif /* DEBUG_SPINLOCK */ |
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| 67 | |||
| 68 | #define __raw_spin_is_contended(lock) (((void)(lock), 0)) |
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| 69 | |||
| 70 | #define __raw_read_can_lock(lock) (((void)(lock), 1)) |
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| 71 | #define __raw_write_can_lock(lock) (((void)(lock), 1)) |
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| 72 | |||
| 73 | #define __raw_spin_unlock_wait(lock) \ |
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| 74 | do { cpu_relax(); } while (__raw_spin_is_locked(lock)) |
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| 75 | |||
| 76 | #endif /* __LINUX_SPINLOCK_UP_H */ |