febc88c594
The full cleanup of init_MUTEX[_LOCKED] and DECLARE_MUTEX has not been done. Some of the users are real semaphores and we should name them as such instead of confusing everyone with "MUTEX". Provide the infrastructure to get finally rid of init_MUTEX[_LOCKED] and DECLARE_MUTEX. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Christoph Hellwig <hch@infradead.org> LKML-Reference: <20100907125054.795929962@linutronix.de>
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/*
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* Copyright (c) 2008 Intel Corporation
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* Author: Matthew Wilcox <willy@linux.intel.com>
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*
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* Distributed under the terms of the GNU GPL, version 2
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*
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* Please see kernel/semaphore.c for documentation of these functions
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*/
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#ifndef __LINUX_SEMAPHORE_H
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#define __LINUX_SEMAPHORE_H
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#include <linux/list.h>
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#include <linux/spinlock.h>
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/* Please don't access any members of this structure directly */
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struct semaphore {
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spinlock_t lock;
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unsigned int count;
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struct list_head wait_list;
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};
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#define __SEMAPHORE_INITIALIZER(name, n) \
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{ \
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.lock = __SPIN_LOCK_UNLOCKED((name).lock), \
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.count = n, \
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.wait_list = LIST_HEAD_INIT((name).wait_list), \
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}
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#define DEFINE_SEMAPHORE(name) \
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struct semaphore name = __SEMAPHORE_INITIALIZER(name, 1)
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#define DECLARE_MUTEX(name) \
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struct semaphore name = __SEMAPHORE_INITIALIZER(name, 1)
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static inline void sema_init(struct semaphore *sem, int val)
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{
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static struct lock_class_key __key;
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*sem = (struct semaphore) __SEMAPHORE_INITIALIZER(*sem, val);
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lockdep_init_map(&sem->lock.dep_map, "semaphore->lock", &__key, 0);
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}
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#define init_MUTEX(sem) sema_init(sem, 1)
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#define init_MUTEX_LOCKED(sem) sema_init(sem, 0)
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extern void down(struct semaphore *sem);
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extern int __must_check down_interruptible(struct semaphore *sem);
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extern int __must_check down_killable(struct semaphore *sem);
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extern int __must_check down_trylock(struct semaphore *sem);
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extern int __must_check down_timeout(struct semaphore *sem, long jiffies);
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extern void up(struct semaphore *sem);
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#endif /* __LINUX_SEMAPHORE_H */
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