mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-19 10:44:14 +08:00
3e45610181
Based on 1 normalized pattern(s): distributed under the terms of the gnu gpl version 2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 2 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531190115.032570679@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (c) 2008 Intel Corporation
|
|
* Author: Matthew Wilcox <willy@linux.intel.com>
|
|
*
|
|
* Please see kernel/locking/semaphore.c for documentation of these functions
|
|
*/
|
|
#ifndef __LINUX_SEMAPHORE_H
|
|
#define __LINUX_SEMAPHORE_H
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
/* Please don't access any members of this structure directly */
|
|
struct semaphore {
|
|
raw_spinlock_t lock;
|
|
unsigned int count;
|
|
struct list_head wait_list;
|
|
};
|
|
|
|
#define __SEMAPHORE_INITIALIZER(name, n) \
|
|
{ \
|
|
.lock = __RAW_SPIN_LOCK_UNLOCKED((name).lock), \
|
|
.count = n, \
|
|
.wait_list = LIST_HEAD_INIT((name).wait_list), \
|
|
}
|
|
|
|
#define DEFINE_SEMAPHORE(name) \
|
|
struct semaphore name = __SEMAPHORE_INITIALIZER(name, 1)
|
|
|
|
static inline void sema_init(struct semaphore *sem, int val)
|
|
{
|
|
static struct lock_class_key __key;
|
|
*sem = (struct semaphore) __SEMAPHORE_INITIALIZER(*sem, val);
|
|
lockdep_init_map(&sem->lock.dep_map, "semaphore->lock", &__key, 0);
|
|
}
|
|
|
|
extern void down(struct semaphore *sem);
|
|
extern int __must_check down_interruptible(struct semaphore *sem);
|
|
extern int __must_check down_killable(struct semaphore *sem);
|
|
extern int __must_check down_trylock(struct semaphore *sem);
|
|
extern int __must_check down_timeout(struct semaphore *sem, long jiffies);
|
|
extern void up(struct semaphore *sem);
|
|
|
|
#endif /* __LINUX_SEMAPHORE_H */
|