patch-2.4.4 linux/include/asm-s390/semaphore-helper.h
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- Lines: 101
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.4.3/linux/include/asm-s390/semaphore-helper.h
- Orig date:
Fri May 12 11:41:44 2000
diff -u --recursive --new-file v2.4.3/linux/include/asm-s390/semaphore-helper.h linux/include/asm-s390/semaphore-helper.h
@@ -1,100 +0,0 @@
-/*
- * include/asm-s390/semaphore-helper.h
- *
- * S390 version
- * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
- *
- * Derived from "include/asm-i386/semaphore-helper.h"
- * (C) Copyright 1996 Linus Torvalds
- * (C) Copyright 1999 Andrea Arcangeli
- */
-
-#ifndef _S390_SEMAPHORE_HELPER_H
-#define _S390_SEMAPHORE_HELPER_H
-
-/*
- * These two _must_ execute atomically wrt each other.
- *
- * This is trivially done with load_locked/store_cond,
- * but on the x86 we need an external synchronizer.
- */
-static inline void wake_one_more(struct semaphore * sem)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&semaphore_wake_lock, flags);
- sem->waking++;
- spin_unlock_irqrestore(&semaphore_wake_lock, flags);
-}
-
-static inline int waking_non_zero(struct semaphore *sem)
-{
- unsigned long flags;
- int ret = 0;
-
- spin_lock_irqsave(&semaphore_wake_lock, flags);
- if (sem->waking > 0) {
- sem->waking--;
- ret = 1;
- }
- spin_unlock_irqrestore(&semaphore_wake_lock, flags);
- return ret;
-}
-
-/*
- * waking_non_zero_interruptible:
- * 1 got the lock
- * 0 go to sleep
- * -EINTR interrupted
- *
- * If we give up we must undo our count-decrease we previously did in down().
- * Subtle: up() can continue to happens and increase the semaphore count
- * even during our critical section protected by the spinlock. So
- * we must remeber to undo the sem->waking that will be run from
- * wake_one_more() some time soon, if the semaphore count become > 0.
- */
-static inline int waking_non_zero_interruptible(struct semaphore *sem,
- struct task_struct *tsk)
-{
- unsigned long flags;
- int ret = 0;
-
- spin_lock_irqsave(&semaphore_wake_lock, flags);
- if (sem->waking > 0) {
- sem->waking--;
- ret = 1;
- } else if (signal_pending(tsk)) {
- if (atomic_inc_and_test_greater_zero(&sem->count))
- sem->waking--;
- ret = -EINTR;
- }
- spin_unlock_irqrestore(&semaphore_wake_lock, flags);
- return ret;
-}
-
-/*
- * waking_non_zero_trylock:
- * 1 failed to lock
- * 0 got the lock
- *
- * Implementation details are the same of the interruptible case.
- */
-static inline int waking_non_zero_trylock(struct semaphore *sem)
-{
- unsigned long flags;
- int ret = 1;
-
- spin_lock_irqsave(&semaphore_wake_lock, flags);
- if (sem->waking <= 0)
- {
- if (atomic_inc_and_test_greater_zero(&sem->count))
- sem->waking--;
- } else {
- sem->waking--;
- ret = 0;
- }
- spin_unlock_irqrestore(&semaphore_wake_lock, flags);
- return ret;
-}
-
-#endif
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