diff options
Diffstat (limited to 'include/asm-sh/semaphore-helper.h')
| -rw-r--r-- | include/asm-sh/semaphore-helper.h | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/include/asm-sh/semaphore-helper.h b/include/asm-sh/semaphore-helper.h deleted file mode 100644 index bd8230c369ca..000000000000 --- a/include/asm-sh/semaphore-helper.h +++ /dev/null | |||
| @@ -1,89 +0,0 @@ | |||
| 1 | #ifndef __ASM_SH_SEMAPHORE_HELPER_H | ||
| 2 | #define __ASM_SH_SEMAPHORE_HELPER_H | ||
| 3 | |||
| 4 | /* | ||
| 5 | * SMP- and interrupt-safe semaphores helper functions. | ||
| 6 | * | ||
| 7 | * (C) Copyright 1996 Linus Torvalds | ||
| 8 | * (C) Copyright 1999 Andrea Arcangeli | ||
| 9 | */ | ||
| 10 | |||
| 11 | /* | ||
| 12 | * These two _must_ execute atomically wrt each other. | ||
| 13 | * | ||
| 14 | * This is trivially done with load_locked/store_cond, | ||
| 15 | * which we have. Let the rest of the losers suck eggs. | ||
| 16 | */ | ||
| 17 | static __inline__ void wake_one_more(struct semaphore * sem) | ||
| 18 | { | ||
| 19 | atomic_inc((atomic_t *)&sem->sleepers); | ||
| 20 | } | ||
| 21 | |||
| 22 | static __inline__ int waking_non_zero(struct semaphore *sem) | ||
| 23 | { | ||
| 24 | unsigned long flags; | ||
| 25 | int ret = 0; | ||
| 26 | |||
| 27 | spin_lock_irqsave(&semaphore_wake_lock, flags); | ||
| 28 | if (sem->sleepers > 0) { | ||
| 29 | sem->sleepers--; | ||
| 30 | ret = 1; | ||
| 31 | } | ||
| 32 | spin_unlock_irqrestore(&semaphore_wake_lock, flags); | ||
| 33 | return ret; | ||
| 34 | } | ||
| 35 | |||
| 36 | /* | ||
| 37 | * waking_non_zero_interruptible: | ||
| 38 | * 1 got the lock | ||
| 39 | * 0 go to sleep | ||
| 40 | * -EINTR interrupted | ||
| 41 | * | ||
| 42 | * We must undo the sem->count down_interruptible() increment while we are | ||
| 43 | * protected by the spinlock in order to make atomic this atomic_inc() with the | ||
| 44 | * atomic_read() in wake_one_more(), otherwise we can race. -arca | ||
| 45 | */ | ||
| 46 | static __inline__ int waking_non_zero_interruptible(struct semaphore *sem, | ||
| 47 | struct task_struct *tsk) | ||
| 48 | { | ||
| 49 | unsigned long flags; | ||
| 50 | int ret = 0; | ||
| 51 | |||
| 52 | spin_lock_irqsave(&semaphore_wake_lock, flags); | ||
| 53 | if (sem->sleepers > 0) { | ||
| 54 | sem->sleepers--; | ||
| 55 | ret = 1; | ||
| 56 | } else if (signal_pending(tsk)) { | ||
| 57 | atomic_inc(&sem->count); | ||
| 58 | ret = -EINTR; | ||
| 59 | } | ||
| 60 | spin_unlock_irqrestore(&semaphore_wake_lock, flags); | ||
| 61 | return ret; | ||
| 62 | } | ||
| 63 | |||
| 64 | /* | ||
| 65 | * waking_non_zero_trylock: | ||
| 66 | * 1 failed to lock | ||
| 67 | * 0 got the lock | ||
| 68 | * | ||
| 69 | * We must undo the sem->count down_trylock() increment while we are | ||
| 70 | * protected by the spinlock in order to make atomic this atomic_inc() with the | ||
| 71 | * atomic_read() in wake_one_more(), otherwise we can race. -arca | ||
| 72 | */ | ||
| 73 | static __inline__ int waking_non_zero_trylock(struct semaphore *sem) | ||
| 74 | { | ||
| 75 | unsigned long flags; | ||
| 76 | int ret = 1; | ||
| 77 | |||
| 78 | spin_lock_irqsave(&semaphore_wake_lock, flags); | ||
| 79 | if (sem->sleepers <= 0) | ||
| 80 | atomic_inc(&sem->count); | ||
| 81 | else { | ||
| 82 | sem->sleepers--; | ||
| 83 | ret = 0; | ||
| 84 | } | ||
| 85 | spin_unlock_irqrestore(&semaphore_wake_lock, flags); | ||
| 86 | return ret; | ||
| 87 | } | ||
| 88 | |||
| 89 | #endif /* __ASM_SH_SEMAPHORE_HELPER_H */ | ||
