URL
https://opencores.org/ocsvn/or1k/or1k/trunk
Subversion Repositories or1k
[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-s390/] [semaphore.h] - Rev 1765
Compare with Previous | Blame | View Log
/* * include/asm-s390/semaphore.h * * S390 version * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation * * Derived from "include/asm-i386/semaphore.h" * (C) Copyright 1996 Linus Torvalds */ #ifndef _S390_SEMAPHORE_H #define _S390_SEMAPHORE_H #include <asm/system.h> #include <asm/atomic.h> #include <linux/wait.h> #include <linux/rwsem.h> struct semaphore { atomic_t count; int sleepers; wait_queue_head_t wait; }; #define __SEM_DEBUG_INIT(name) #define __SEMAPHORE_INITIALIZER(name,count) \ { ATOMIC_INIT(count), 0, __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \ __SEM_DEBUG_INIT(name) } #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); } asmlinkage void __down_failed(void /* special register calling convention */); asmlinkage int __down_failed_interruptible(void /* params in registers */); asmlinkage int __down_failed_trylock(void /* params in registers */); asmlinkage void __up_wakeup(void /* special register calling convention */); asmlinkage void __down(struct semaphore * sem); asmlinkage int __down_interruptible(struct semaphore * sem); asmlinkage int __down_trylock(struct semaphore * sem); asmlinkage void __up(struct semaphore * sem); static inline void down(struct semaphore * sem) { if (atomic_dec_return(&sem->count) < 0) __down(sem); } static inline int down_interruptible(struct semaphore * sem) { int ret = 0; 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); } static inline int sem_getcount(struct semaphore *sem) { return atomic_read(&sem->count); } #endif