xhl.h

一个封装的信号量类

#ifndef __XHL_H__
#define __XHL_H__

#include <sys/sem.h>
#include <stdio.h>
#include <stdlib.h>

class SemClass
{
public:
	SemClass();
	SemClass(key_t key,int mutex);

	//初始化信号量
	//key信号量唯一的标识符
	//mutex共建立几个信号量
	void SemInit(key_t key,int mutex);

	//sem_num第几个信号量, 从零开始,到mutex-1
	//pv信号量初值,也就是资源数量
	void SemSet(short sem_num,short pv);

	void P(short sem_num); //减
	void V(short sem_num); //增
private:
	struct sembuf m_ops,*m_pops;
	int m_sem_id;
	key_t m_key;
	int m_mutex;
private:
	void PV(short sem_num,short pv);
};

#endif //__XHL_H__