互斥对象锁和临界区锁性能比较
互斥对象锁和临界区锁性能比较
在Win32平台上进行多线程编程,常会用到锁。下边用C++实现了互斥对象(Mutex)锁和临界区(CRITICAL_SECTION)锁,以加深理解和今后方便使用。代码已在VS2005环境下编译测试通过。
Lock.h
- #ifndef _Lock_H
- #define _Lock_H
- #include <windows.h>
- //锁接口类
- class ILock
- {
- public:
- virtual ~ILock() {}
- virtual void Lock() const = 0;
- virtual void Unlock() const = 0;
- };
- //互斥对象锁类
- class Mutex : public ILock
- {
- public:
- Mutex();
- ~Mutex();
- virtual void Lock() const;
- virtual void Unlock() const;
- private:
- HANDLE m_mutex;
- };
- //临界区锁类
- class CriSection : public ILock
- {
- public:
- CriSection();
- ~CriSection();
- virtual void Lock() const;
- virtual void Unlock() const;
- private:
- CRITICAL_SECTION m_critclSection;
- };
- //锁
- class CMyLock
- {
- public:
- CMyLock(const ILock&);
- ~CMyLock();
- private:
- const ILock& m_lock;
- };
- #endif
Lock.cpp
- #include "Lock.h"
- //---------------------------------------------------------------------------
- //创建一个匿名互斥对象
- Mutex::Mutex()
- {
- m_mutex = ::CreateMutex(NULL, FALSE, NULL);
- }
- //销毁互斥对象,释放资源
- Mutex::~Mutex()
- {
- ::CloseHandle(m_mutex);
- }
- //确保拥有互斥对象的线程对被保护资源的独自访问
- void Mutex::Lock() const
- {
- DWORD d = WaitForSingleObject(m_mutex, INFINITE);
- }
- //释放当前线程拥有的互斥对象,以使其它线程可以拥有互斥对象,对被保护资源进行访问
- void Mutex::Unlock() const
- {
- ::ReleaseMutex(m_mutex);
- }
- //---------------------------------------------------------------------------
- //初始化临界资源对象
- CriSection::CriSection()
- {
- ::InitializeCriticalSection(&m_critclSection);
- }
- //释放临界资源对象
- CriSection::~CriSection()
- {
- ::DeleteCriticalSection(&m_critclSection);
- }
- //进入临界区,加锁
- void CriSection::Lock() const
- {
- ::EnterCriticalSection((LPCRITICAL_SECTION)&m_critclSection);
- }
- //离开临界区,解锁
- void CriSection::Unlock() const
- {
- ::LeaveCriticalSection((LPCRITICAL_SECTION)&m_critclSection);
- }
- //---------------------------------------------------------------------------
- //利用C++特性,进行自动加锁
- CMyLock::CMyLock(const ILock& m) : m_lock(m)
- {
- m_lock.Lock();
- }
- //利用C++特性,进行自动解锁
- CMyLock::~CMyLock()
- {
- m_lock.Unlock();
- }
|
评论暂时关闭