1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ipc/chromium/src/base/at_exit.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,73 @@
1.4 +// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#ifndef BASE_AT_EXIT_H_
1.9 +#define BASE_AT_EXIT_H_
1.10 +
1.11 +#include <stack>
1.12 +
1.13 +#include "base/basictypes.h"
1.14 +#include "base/lock.h"
1.15 +
1.16 +namespace base {
1.17 +
1.18 +// This class provides a facility similar to the CRT atexit(), except that
1.19 +// we control when the callbacks are executed. Under Windows for a DLL they
1.20 +// happen at a really bad time and under the loader lock. This facility is
1.21 +// mostly used by base::Singleton.
1.22 +//
1.23 +// The usage is simple. Early in the main() or WinMain() scope create an
1.24 +// AtExitManager object on the stack:
1.25 +// int main(...) {
1.26 +// base::AtExitManager exit_manager;
1.27 +//
1.28 +// }
1.29 +// When the exit_manager object goes out of scope, all the registered
1.30 +// callbacks and singleton destructors will be called.
1.31 +
1.32 +class AtExitManager {
1.33 + protected:
1.34 + // This constructor will allow this instance of AtExitManager to be created
1.35 + // even if one already exists. This should only be used for testing!
1.36 + // AtExitManagers are kept on a global stack, and it will be removed during
1.37 + // destruction. This allows you to shadow another AtExitManager.
1.38 + AtExitManager(bool shadow);
1.39 +
1.40 + public:
1.41 + typedef void (*AtExitCallbackType)(void*);
1.42 +
1.43 + AtExitManager();
1.44 +
1.45 + // The dtor calls all the registered callbacks. Do not try to register more
1.46 + // callbacks after this point.
1.47 + ~AtExitManager();
1.48 +
1.49 + // Registers the specified function to be called at exit. The prototype of
1.50 + // the callback function is void func().
1.51 + static void RegisterCallback(AtExitCallbackType func, void* param);
1.52 +
1.53 + // Calls the functions registered with RegisterCallback in LIFO order. It
1.54 + // is possible to register new callbacks after calling this function.
1.55 + static void ProcessCallbacksNow();
1.56 +
1.57 + static bool AlreadyRegistered();
1.58 +
1.59 + private:
1.60 + struct CallbackAndParam {
1.61 + CallbackAndParam(AtExitCallbackType func, void* param)
1.62 + : func_(func), param_(param) { }
1.63 + AtExitCallbackType func_;
1.64 + void* param_;
1.65 + };
1.66 +
1.67 + Lock lock_;
1.68 + std::stack<CallbackAndParam> stack_;
1.69 + AtExitManager* next_manager_; // Stack of managers to allow shadowing.
1.70 +
1.71 + DISALLOW_COPY_AND_ASSIGN(AtExitManager);
1.72 +};
1.73 +
1.74 +} // namespace base
1.75 +
1.76 +#endif // BASE_AT_EXIT_H_
