chromium之at_exit

最新推荐文章于 2024-02-07 10:50:57 发布

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最新推荐文章于 2024-02-07 10:50:57 发布

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原文链接：http://www.cnblogs.com/ckelsel/p/9158805.html

本文介绍了AtExitManager类的使用方法及原理。AtExitManager提供了一种机制，可以在程序退出前执行注册的回调函数和单例析构操作。通过在main函数中创建AtExitManager实例，确保所有回调和析构函数在程序结束前被正确调用。

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// This class provides a facility similar to the CRT atexit(), except that
// we control when the callbacks are executed. Under Windows for a DLL they
// happen at a really bad time and under the loader lock. This facility is
// mostly used by base::Singleton.
//
// The usage is simple. Early in the main() or WinMain() scope create an
// AtExitManager object on the stack:
// int main(...) {
//    base::AtExitManager exit_manager;
//
// }
// When the exit_manager object goes out of scope, all the registered
// callbacks and singleton destructors will be called.

exit_manager离开作用域，所有的回调函数，单例的析构函数将会被调用。

再看看头文件

class AtExitManager {
 protected:
  // This constructor will allow this instance of AtExitManager to be created
  // even if one already exists.  This should only be used for testing!
  // AtExitManagers are kept on a global stack, and it will be removed during
  // destruction.  This allows you to shadow another AtExitManager.
  AtExitManager(bool shadow);

 public:
  typedef void (*AtExitCallbackType)(void*);

  AtExitManager();

  // The dtor calls all the registered callbacks. Do not try to register more
  // callbacks after this point.
  ~AtExitManager();

  // Registers the specified function to be called at exit. The prototype of
  // the callback function is void func().
  static void RegisterCallback(AtExitCallbackType func, void* param);

  // Calls the functions registered with RegisterCallback in LIFO order. It
  // is possible to register new callbacks after calling this function.
  static void ProcessCallbacksNow();

使用方法很简单，只要在main函数最开始的地方，定义一个即可

int main(...) 
{
   base::AtExitManager exit_manager;

   ....
}

转载于:https://www.cnblogs.com/ckelsel/p/9158805.html