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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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.
AtExitManager(bool shadow);
public:
typedef void (*AtExitCallbackType)();
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);
// Calls the functions registered with RegisterCallback in LIFO order. It
// is possible to register new callbacks after calling this function.
static void ProcessCallbacksNow();
private:
Lock lock_;
std::stack<AtExitCallbackType> stack_;
AtExitManager* next_manager_; // Stack of managers to allow shadowing.
DISALLOW_COPY_AND_ASSIGN(AtExitManager);
};
} // namespace base
#endif // BASE_AT_EXIT_H_
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