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shm_rwlock.h
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shm_rwlock.h
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//
// Created by 杜国超 on 19-1-22.
// Copyright © 2019年 杜国超. All rights reserved.
// 共享内存数据读写锁
//
#ifndef SHMQUEUE_SHM_RWLOCK_H
#define SHMQUEUE_SHM_RWLOCK_H
#include <sys/sem.h>
#include <sys/types.h>
namespace shmmqueue
{
class CShmRWlock
{
public:
// 构造函数
CShmRWlock();
//构造函数.
CShmRWlock(key_t iKey);
//读锁
int Rlock() const;
//释放读锁
int UnRlock() const;
/**
* TryRlock
* @return true lock ok,false lock failed
*/
bool TryRlock() const;
//写锁
int Wlock() const;
//释放写锁
int UnWlock() const;
/**
* TryRlock
* @return true lock ok,false lock failed
*/
bool TryWlock() const;
//lock block until lock sucess
int Lock() const;
//Unlock
int Unlock() const;
/**
* trylock
* @return true lock ok,false lock failed
*/
bool trylock() const;
//get sem key
key_t Getkey() const;
//get sem id
int getid() const;
private:
//初始化
void init(key_t iKey);
protected:
int m_iSemID;
key_t m_iSemKey;
};
class CSafeShmRlock
{
public:
CSafeShmRlock() : m_pLock(NULL)
{
}
CSafeShmRlock(CShmRWlock *pLock)
: m_pLock(pLock)
{
if (m_pLock != NULL)
{
m_pLock->Rlock();
}
}
void InitLock(CShmRWlock *pLock)
{
m_pLock = pLock;
m_pLock->Rlock();
}
~CSafeShmRlock()
{
m_pLock->UnRlock();
}
private:
CShmRWlock *m_pLock;
};
class CSafeShmWlock
{
public:
CSafeShmWlock()
: m_pLock(NULL)
{
}
CSafeShmWlock(CShmRWlock *pLock)
: m_pLock(pLock)
{
m_pLock->Wlock();
}
void InitLock(CShmRWlock *pLock)
{
m_pLock = pLock;
m_pLock->Wlock();
}
~CSafeShmWlock()
{
if (m_pLock != NULL)
{
m_pLock->UnWlock();
}
}
private:
CShmRWlock *m_pLock;
};
}
#endif //SHMQUEUE_SHM_RWLOCK_H