sem.h

c接口与实现的源码

/* $Id: H:/drh/idioms/book/RCS/thread.doc,v 1.11 1997/02/21 19:50:51 drh Exp $ */
#ifndef SEM_INCLUDED
#define SEM_INCLUDED
#define T Sem_T
typedef struct T {
	int count;
	void *queue;
} T;
#define LOCK(mutex) do { Sem_T *_yymutex = &(mutex); \
	Sem_wait(_yymutex);
#define END_LOCK Sem_signal(_yymutex); } while (0)
extern void Sem_init  (T *s, int count);
extern T   *Sem_new   (int count);
extern void Sem_wait  (T *s);
extern void Sem_signal(T *s);
#undef T
#endif