使STL容器线程安全的类（转载）

最新推荐文章于 2024-05-21 09:59:20 发布

原创最新推荐文章于 2024-05-21 09:59:20 发布 · 1.1k 阅读

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#destructor #object #header #class #thread #wrapper

本文介绍了C++的ThreadSafeObject类，它是一个线程安全的包装类，利用Windows API临界区逻辑，能将任意对象转换为线程安全对象。其析构函数会自动销毁对象，还给出了使用示例，如创建线程安全的向量和字符串对象。

C++ code colored by C++2HTML

// ThreadSafeObject.h 
//  ThreadSafeObject by David Maisonave (609-345-1007) (www.axter.com)
/*
Description:ThreadSafeObject is a thread safe wrapper class, 
which uses windows API Critical-Section logic. 
It can turn any object into a thread safe object.
ThreadSafeObject destructor will automatically destroy the object,
so the object can be create via new on ThreadSafeObject constructor.
This insures no other process has ownership of the object.
Example Usage
ThreadSafeObject<vector<int> > MyThreadSafeVectorInt(new vector<int>);
MyThreadSafeVectorInt.GetLockedObject()->push_back(123);
cout << MyThreadSafeVectorInt.GetLockedObject()->at(0) << endl;

//An instance of RefLock can be create to lock the object for the duration of a function.
Example Usage
ThreadSafeObject<string> MyThreadSafeString(new string);

string SomeFunction()
{
ThreadSafeObject<string>::RefLock MyLockedString = MyThreadSafeString.GetLockedObject();
MyLockedString->operator=("Hello World");
return MyLockedString->substr(6);
}

//The destructor for RefLock automatically unlocks the object, so an explicit unlock call
//is not required.
*/

#ifndef THREADSAFEOBJECT_H_HEADER_GUARD_
#define THREADSAFEOBJECT_H_HEADER_GUARD_

template<class T>
class ThreadSafeObject
{
public:
     ThreadSafeObject(T* type):m_type(type){InitializeCriticalSection(&m_cs);}
     ~ThreadSafeObject()
     {
          EnterCriticalSection (&m_cs);
          delete m_type;m_type=NULL;
          LeaveCriticalSection(&m_cs);
          DeleteCriticalSection(&m_cs);
     }
     class RefLock
     {
     public:
          RefLock(T* type, CRITICAL_SECTION &cs):m_type(type), m_cs(cs){ EnterCriticalSection (&m_cs);}
          RefLock(const RefLock& Src):m_type(Src.m_type), m_cs(Src.m_cs){ EnterCriticalSection (&m_cs);}
          ~RefLock(){LeaveCriticalSection(&m_cs);}
          inline T* operator->() const{return m_type;}
          inline T& operator*() const{return m_type;}
          T* m_type;
     private:
          CRITICAL_SECTION &m_cs;
     };
     RefLock GetLockedObject()
     {
          return RefLock(m_type, m_cs);
     }
private:
     T* m_type;
     CRITICAL_SECTION m_cs;
     ThreadSafeObject(const ThreadSafeObject&);
     ThreadSafeObject& operator=(const ThreadSafeObject&);
};

#endif //!THREADSAFEOBJECT_H_HEADER_GUARD_