diff options
author | Kent Overstreet <kent.overstreet@gmail.com> | 2020-06-13 19:31:45 -0400 |
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committer | Kent Overstreet <kent.overstreet@gmail.com> | 2020-06-15 16:27:19 -0400 |
commit | 05408b6f8fea54bf53e68a4ef24291214970f6d0 (patch) | |
tree | 2725db5979ad1f63314967741305ab0301c1f6d3 /include/linux/semaphore.h | |
parent | c32bba1325cebd27e4dd3697a4b41ff0df59614f (diff) |
Update bcachefs sources to 4837f82ee1 bcachefs: Use cached iterators for alloc btree
Diffstat (limited to 'include/linux/semaphore.h')
-rw-r--r-- | include/linux/semaphore.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/include/linux/semaphore.h b/include/linux/semaphore.h new file mode 100644 index 00000000..498e717a --- /dev/null +++ b/include/linux/semaphore.h @@ -0,0 +1,43 @@ +/* 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) +{ + *sem = (struct semaphore) __SEMAPHORE_INITIALIZER(*sem, val); +} + +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); +extern void up(struct semaphore *sem); + +#endif /* __LINUX_SEMAPHORE_H */ |