Scoped Locking

hhf

于 2011-07-25 18:06:22 发布

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分类专栏： Design Patterns 文章标签： locking destructor constructor class path c

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本文介绍了 Scoped Locking 模式，这是一种确保锁在进入作用域时被获取，并在离开作用域时自动释放的设计模式。通过定义一个守护类，其构造函数在进入作用域时自动获取锁，析构函数则在退出作用域时释放锁。

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This article is extracted from POSA2 as a reading note.

Scoped Locking is a pattern? I can't answer well until I read the associated portion of POSA2. I used this way to acquire and release a lock so normally.

The Scoped Locking C++ idiom ensures that a lock is acquired when control enters a scope and released automatically when control leaves the scope, regardless of the return path from the scope.

Define a guard class whose constructor automatically acquires a lock when control enters a scope and whose destructor automatically releases the lock when control leaves the scope. Instantiate instances of the guard class to acquire/release locks in method or block scopes that define critical sections.