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45 lines
1.4 KiB
45 lines
1.4 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (c) 2008 Intel Corporation |
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* Author: Matthew Wilcox <[email protected]> |
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* |
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* Please see kernel/locking/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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raw_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 = __RAW_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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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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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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