From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- include/asm-ia64/semaphore.h | 102 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 include/asm-ia64/semaphore.h (limited to 'include/asm-ia64/semaphore.h') diff --git a/include/asm-ia64/semaphore.h b/include/asm-ia64/semaphore.h new file mode 100644 index 00000000000..3a2f0f3f78f --- /dev/null +++ b/include/asm-ia64/semaphore.h @@ -0,0 +1,102 @@ +#ifndef _ASM_IA64_SEMAPHORE_H +#define _ASM_IA64_SEMAPHORE_H + +/* + * Copyright (C) 1998-2000 Hewlett-Packard Co + * Copyright (C) 1998-2000 David Mosberger-Tang + */ + +#include +#include + +#include + +struct semaphore { + atomic_t count; + int sleepers; + wait_queue_head_t wait; +}; + +#define __SEMAPHORE_INITIALIZER(name, n) \ +{ \ + .count = ATOMIC_INIT(n), \ + .sleepers = 0, \ + .wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \ +} + +#define __MUTEX_INITIALIZER(name) __SEMAPHORE_INITIALIZER(name,1) + +#define __DECLARE_SEMAPHORE_GENERIC(name,count) \ + struct semaphore name = __SEMAPHORE_INITIALIZER(name, count) + +#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name, 1) +#define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name, 0) + +static inline void +sema_init (struct semaphore *sem, int val) +{ + *sem = (struct semaphore) __SEMAPHORE_INITIALIZER(*sem, val); +} + +static inline void +init_MUTEX (struct semaphore *sem) +{ + sema_init(sem, 1); +} + +static inline void +init_MUTEX_LOCKED (struct semaphore *sem) +{ + sema_init(sem, 0); +} + +extern void __down (struct semaphore * sem); +extern int __down_interruptible (struct semaphore * sem); +extern int __down_trylock (struct semaphore * sem); +extern void __up (struct semaphore * sem); + +/* + * Atomically decrement the semaphore's count. If it goes negative, + * block the calling thread in the TASK_UNINTERRUPTIBLE state. + */ +static inline void +down (struct semaphore *sem) +{ + might_sleep(); + if (atomic_dec_return(&sem->count) < 0) + __down(sem); +} + +/* + * Atomically decrement the semaphore's count. If it goes negative, + * block the calling thread in the TASK_INTERRUPTIBLE state. + */ +static inline int +down_interruptible (struct semaphore * sem) +{ + int ret = 0; + + might_sleep(); + if (atomic_dec_return(&sem->count) < 0) + ret = __down_interruptible(sem); + return ret; +} + +static inline int +down_trylock (struct semaphore *sem) +{ + int ret = 0; + + if (atomic_dec_return(&sem->count) < 0) + ret = __down_trylock(sem); + return ret; +} + +static inline void +up (struct semaphore * sem) +{ + if (atomic_inc_return(&sem->count) <= 0) + __up(sem); +} + +#endif /* _ASM_IA64_SEMAPHORE_H */ -- cgit v1.2.3