localmutex.h

来自「电力故障信息采集,主要是针对南自的保护装置,这个程序用在Linux操作系统下」· C头文件 代码 · 共 91 行

#ifndef LOCALMUTEX_H
#define LOCALMUTEX_H
#include <semaphore.h>
#include <errno.h>
//******************************************************************************
//本类采用Posix信号灯机制,内存信号灯
class CLocalMutex 
{
    public:
    CLocalMutex(int isLocal=0,unsigned int value=1)
    {
	Open_Semaphore(isLocal,value);
    }
    
    CLocalMutex(bool isManul)
    {
	if(!isManul)
	{
	    Open_Semaphore();
	}
    }
    
    ~CLocalMutex()
    {
	Destroy_Semaphore();
    }
    
    public:
    sem_t	m_sem;
    public:
    bool Open_Semaphore(int isLocal=0,unsigned int value=0)
    {
	int rc=sem_init(&m_sem,isLocal,value);
	if(rc<0) return false;
	return true;
    }
    
    bool Destroy_Semaphore()
    {
	int rc=sem_destroy(&m_sem);
	return (!(rc<0));
    }
    
    bool lock()
    {
	sem_wait(&m_sem);
	return true;
    }
    
    bool trylock()
    {
	int rc=sem_trywait(&m_sem);
	return !(rc==EAGAIN);
    }
    
    bool unlock()
    {
	sem_post(&m_sem);
	return true;
    }
};

class CLMutexLocker 
{
    public:
    CLMutexLocker(CLocalMutex *LocalMutex,bool bWait=false)
    {
	m_LocalMutex=LocalMutex;
	if(!bWait)
	    m_LocalMutex->trylock();
	else
	    m_LocalMutex->lock();
    }
    
    ~CLMutexLocker()
    {
	m_LocalMutex->unlock();
    }
    
    public:
    CLocalMutex* GetMutex()
    {
	return m_LocalMutex;
    }
    
    private:
    CLocalMutex* m_LocalMutex;
};

#endif