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1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (c) 2008 Intel Corporation
4 * Author: Matthew Wilcox <willy@linux.intel.com>
6 * Please see kernel/locking/semaphore.c for documentation of these functions
8 #ifndef __LINUX_SEMAPHORE_H
9 #define __LINUX_SEMAPHORE_H
11 #include <linux/list.h>
12 #include <linux/spinlock.h>
14 /* Please don't access any members of this structure directly */
18 struct list_head wait_list
;
21 #define __SEMAPHORE_INITIALIZER(name, n) \
23 .lock = __RAW_SPIN_LOCK_UNLOCKED((name).lock), \
25 .wait_list = LIST_HEAD_INIT((name).wait_list), \
28 #define DEFINE_SEMAPHORE(name) \
29 struct semaphore name = __SEMAPHORE_INITIALIZER(name, 1)
31 static inline void sema_init(struct semaphore
*sem
, int val
)
33 static struct lock_class_key __key
;
34 *sem
= (struct semaphore
) __SEMAPHORE_INITIALIZER(*sem
, val
);
35 lockdep_init_map(&sem
->lock
.dep_map
, "semaphore->lock", &__key
, 0);
38 extern void down(struct semaphore
*sem
);
39 extern int __must_check
down_interruptible(struct semaphore
*sem
);
40 extern int __must_check
down_killable(struct semaphore
*sem
);
41 extern int __must_check
down_trylock(struct semaphore
*sem
);
42 extern int __must_check
down_timeout(struct semaphore
*sem
, long jiffies
);
43 extern void up(struct semaphore
*sem
);
45 #endif /* __LINUX_SEMAPHORE_H */