一个简单的进程间mutex和读写锁类

因为最近一直在做程序使用共享内存的改造，自然也就涉及到进程间同步的问题，以下是一个简单的进程间锁的例子，通过在父进程声明，然后在fork出来的子进程变可以使用这个锁的对象来进程数据访问的互斥控制。

#ifndef _SHARE_LOCK_H_#define _SHARE_LOCK_H_//进程间mutex,在父进程定义，fork之后加锁解锁对父子进程间有效class ShareMutex{public:ShareMutex::ShareMutex();ShareMutex::~ShareMutex();void Lock();void UnLock();private:pthread_mutex_t* m_pMutex;};//进程间读写锁,fork之后加锁解锁对父子进程间有效class ShareRwlock{public:ShareRwlock::ShareRwlock();ShareRwlock::~ShareRwlock();void WrLock();void RdLock();void UnLock();private:pthread_rwlock_t* m_pRwlock;};#endif

cpp 文件

#include "ShareMutex.h"ShareMutex::ShareMutex(){    m_pMutex = (pthread_mutex_t *)mmap(NULL, sizeof(pthread_mutex_t), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);    pthread_mutexattr_t attr_perf;    pthread_mutexattr_init(&attr_perf));    pthread_mutexattr_setpshared(&attr_perf, PTHREAD_PROCESS_SHARED);    pthread_mutex_init(g_perf_mutex, &attr_perf);    }ShareMutex::~ShareMutex(){    m_pRwLocked_mutex_destroy(m_pMutex);    munmap(m_pMutex, sizeof(pthread_mutex_t));}void ShareMutex::Lock(){    if(0 != pthread_mutex_lock(m_pMutex))    {        throw TCException("ShareMutex::Lock() exception!");    }}void ShareMutex::UnLock(){    if(0 != pthread_mutex_unlock(m_pMutex))    {        throw TCException("ShareMutex::UnLock() exception!");    }}ShareRwlock::ShareRwlock(){    m_pRwlock = (pthread_rwlock_t *)mmap(NULL, sizeof(pthread_rwlock_t), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);    pthread_rwlockattr_t attr_pub;     pthread_rwlockattr_init( &attr_pub );     pthread_rwlockattr_setpshared( &attr_pub, PTHREAD_PROCESS_SHARED );     pthread_rwlock_init( m_pRwLock, &attr_pub );}ShareRwlock::~ShareRwlock(){    pthread_rwlock_destroy(m_pRwlock);    munmap(m_pRwlock, sizeof(pthread_rwlock_t));}void ShareRwlock::WrLock(){    if(0 != pthread_rwlock_wrlock( m_pRwLock ))    {        throw TCException("ShareRwlock::WrLock() exception!");    }}void ShareRwlock::RdLock(){    if(0 != pthread_rwlock_rdlock( m_pRwLock ))    {        throw TCException("ShareRwlock::RdLock() exception!");    }}void ShareRwlock::UnLock(){    if(0 != pthread_rwlock_unlock( m_pRwLock ))    {        throw TCException("ShareRwlock::UnLock() exception!");    }}