mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-06-19 19:29:32 +00:00
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#ifndef BASE_AT_EXIT_H_
|
|
#define BASE_AT_EXIT_H_
|
|
|
|
#include <stack>
|
|
|
|
#include "base/basictypes.h"
|
|
#include "base/lock.h"
|
|
|
|
namespace base {
|
|
|
|
// 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.
|
|
|
|
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.
|
|
explicit 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();
|
|
|
|
static bool AlreadyRegistered();
|
|
|
|
private:
|
|
struct CallbackAndParam {
|
|
CallbackAndParam(AtExitCallbackType func, void* param)
|
|
: func_(func), param_(param) { }
|
|
AtExitCallbackType func_;
|
|
void* param_;
|
|
};
|
|
|
|
Lock lock_;
|
|
std::stack<CallbackAndParam> stack_;
|
|
AtExitManager* next_manager_; // Stack of managers to allow shadowing.
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(AtExitManager);
|
|
};
|
|
|
|
} // namespace base
|
|
|
|
#endif // BASE_AT_EXIT_H_
|