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89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
// Copyright 2011 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_AT_EXIT_H_
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#define BASE_AT_EXIT_H_
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#include "base/base_export.h"
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#include "base/containers/stack.h"
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#include "base/dcheck_is_on.h"
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#include "base/functional/callback.h"
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#include "base/memory/raw_ptr.h"
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#include "base/synchronization/lock.h"
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#include "base/thread_annotations.h"
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namespace base {
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// This class provides a facility similar to the CRT atexit(), except that
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// we control when the callbacks are executed. Under Windows for a DLL they
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// happen at a really bad time and under the loader lock. This facility is
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// mostly used by base::Singleton.
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//
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// The usage is simple. Early in the main() or WinMain() scope create an
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// AtExitManager object on the stack:
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// int main(...) {
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// base::AtExitManager exit_manager;
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//
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// }
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// When the exit_manager object goes out of scope, all the registered
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// callbacks and singleton destructors will be called.
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class BASE_EXPORT AtExitManager {
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public:
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typedef void (*AtExitCallbackType)(void*);
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AtExitManager();
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AtExitManager(const AtExitManager&) = delete;
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AtExitManager& operator=(const AtExitManager&) = delete;
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// The dtor calls all the registered callbacks. Do not try to register more
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// callbacks after this point.
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~AtExitManager();
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// Registers the specified function to be called at exit. The prototype of
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// the callback function is void func(void*).
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static void RegisterCallback(AtExitCallbackType func, void* param);
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// Registers the specified task to be called at exit.
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static void RegisterTask(base::OnceClosure task);
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// Calls the functions registered with RegisterCallback in LIFO order. It
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// is possible to register new callbacks after calling this function.
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static void ProcessCallbacksNow();
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// Disable all registered at-exit callbacks. This is used only in a single-
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// process mode.
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static void DisableAllAtExitManagers();
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protected:
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// This constructor will allow this instance of AtExitManager to be created
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// even if one already exists. This should only be used for testing!
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// AtExitManagers are kept on a global stack, and it will be removed during
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// destruction. This allows you to shadow another AtExitManager.
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explicit AtExitManager(bool shadow);
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private:
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base::Lock lock_;
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base::stack<base::OnceClosure> stack_ GUARDED_BY(lock_);
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#if DCHECK_IS_ON()
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bool processing_callbacks_ GUARDED_BY(lock_) = false;
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#endif
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// Stack of managers to allow shadowing.
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const raw_ptr<AtExitManager, DanglingUntriaged> next_manager_;
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};
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#if defined(UNIT_TEST)
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class ShadowingAtExitManager : public AtExitManager {
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public:
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ShadowingAtExitManager() : AtExitManager(true) {}
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};
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#endif // defined(UNIT_TEST)
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} // namespace base
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#endif // BASE_AT_EXIT_H_
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