CCriticalSection与CSingleLock

最新推荐文章于 2025-06-04 13:44:08 发布

Gordennizaicunzai

最新推荐文章于 2025-06-04 13:44:08 发布

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分类专栏： VC++ 文章标签： CCriticalSection CSingleLock 资源保护

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CCriticalSection是用于线程同步的类，它允许同一时间只有一个线程访问资源，适合速度关键且资源不跨进程的情况。CSingleLock则用于控制对资源的访问，通过Lock和Unlock成员函数实现线程安全的资源访问。使用时，CSingleLock对象需要CSyncObject派生对象的存在。

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CCriticalSection

An object of class CCriticalSection represents a “critical section” — a synchronization object that allows one thread at a time to access a resource or section of code. Critical sections are useful when only one thread at a time can be allowed to modify data or some other controlled resource. For example, adding nodes to a linked list is a process that should only be allowed by one thread at a time. By using a CCriticalSection object to control the linked list, only one thread at a time can gain access to the list.

Critical sections are used instead of mutexes when speed is critical and the resource will not be used across process boundaries. For more information on using mutexes in MFC, see CMutex.

To use a CCriticalSection object, construct the CCriticalSection object when it is needed. You can then access the critical section when the constructor returns. Call Unlock when you are done accessing the critical section.

To access a resource controlled by a CCriticalSection object in this manner, first create a variable of type CSingleLock in your resource’s access member function. Then call the lock object’s Lock member function (for example, CSingleLock::Lock). At this point, your thread will either gain access to the resource, wait for the resource to be released and gain access, or wait for the resource to be released and time out, failing to gain access to the resource. In any case, your resource has been accessed in a thr