chromium/base/at_exit.h

// Copyright 2011 The Chromium Authors
// 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 "base/base_export.h"
#include "base/containers/stack.h"
#include "base/dcheck_is_on.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.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 BASE_EXPORT AtExitManager { … };

#if defined(UNIT_TEST)
class ShadowingAtExitManager : public AtExitManager {
 public:
  ShadowingAtExitManager() : AtExitManager(true) {}
};
#endif  // defined(UNIT_TEST)

}  // namespace base

#endif  // BASE_AT_EXIT_H_