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// Copyright (c) 2011 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_
#pragma once
#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 {
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();
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);
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);
};
#if defined(UNIT_TEST)
class ShadowingAtExitManager : public AtExitManager {
public:
ShadowingAtExitManager() : AtExitManager(true) {}
};
#endif // defined(UNIT_TEST)
} // namespace base
#endif // BASE_AT_EXIT_H_
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