mirror of https://gitee.com/openkylin/linux.git
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
#ifndef _SPARC64_SEMAPHORE_H
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#define _SPARC64_SEMAPHORE_H
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/* These are actually reasonable on the V9.
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*
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* See asm-ppc/semaphore.h for implementation commentary,
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* only sparc64 specific issues are commented here.
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*/
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#ifdef __KERNEL__
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#include <asm/atomic.h>
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#include <asm/system.h>
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#include <linux/wait.h>
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#include <linux/rwsem.h>
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struct semaphore {
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atomic_t count;
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wait_queue_head_t wait;
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};
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#define __SEMAPHORE_INITIALIZER(name, count) \
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{ ATOMIC_INIT(count), \
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__WAIT_QUEUE_HEAD_INITIALIZER((name).wait) }
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#define __MUTEX_INITIALIZER(name) \
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__SEMAPHORE_INITIALIZER(name, 1)
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#define __DECLARE_SEMAPHORE_GENERIC(name, count) \
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struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
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#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name, 1)
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#define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name, 0)
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static inline void sema_init (struct semaphore *sem, int val)
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{
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atomic_set(&sem->count, val);
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init_waitqueue_head(&sem->wait);
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}
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static inline void init_MUTEX (struct semaphore *sem)
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{
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sema_init(sem, 1);
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}
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static inline void init_MUTEX_LOCKED (struct semaphore *sem)
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{
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sema_init(sem, 0);
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}
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extern void up(struct semaphore *sem);
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extern void down(struct semaphore *sem);
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extern int down_trylock(struct semaphore *sem);
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extern int down_interruptible(struct semaphore *sem);
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#endif /* __KERNEL__ */
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#endif /* !(_SPARC64_SEMAPHORE_H) */
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