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comparison: ipc/chromium/src/base/at_exit.h
ipc/chromium/src/base/at_exit.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:082f431e4a16 |
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| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef BASE_AT_EXIT_H_ | |
| 6 #define BASE_AT_EXIT_H_ | |
| 7 | |
| 8 #include <stack> | |
| 9 | |
| 10 #include "base/basictypes.h" | |
| 11 #include "base/lock.h" | |
| 12 | |
| 13 namespace base { | |
| 14 | |
| 15 // This class provides a facility similar to the CRT atexit(), except that | |
| 16 // we control when the callbacks are executed. Under Windows for a DLL they | |
| 17 // happen at a really bad time and under the loader lock. This facility is | |
| 18 // mostly used by base::Singleton. | |
| 19 // | |
| 20 // The usage is simple. Early in the main() or WinMain() scope create an | |
| 21 // AtExitManager object on the stack: | |
| 22 // int main(...) { | |
| 23 // base::AtExitManager exit_manager; | |
| 24 // | |
| 25 // } | |
| 26 // When the exit_manager object goes out of scope, all the registered | |
| 27 // callbacks and singleton destructors will be called. | |
| 28 | |
| 29 class AtExitManager { | |
| 30 protected: | |
| 31 // This constructor will allow this instance of AtExitManager to be created | |
| 32 // even if one already exists. This should only be used for testing! | |
| 33 // AtExitManagers are kept on a global stack, and it will be removed during | |
| 34 // destruction. This allows you to shadow another AtExitManager. | |
| 35 AtExitManager(bool shadow); | |
| 36 | |
| 37 public: | |
| 38 typedef void (*AtExitCallbackType)(void*); | |
| 39 | |
| 40 AtExitManager(); | |
| 41 | |
| 42 // The dtor calls all the registered callbacks. Do not try to register more | |
| 43 // callbacks after this point. | |
| 44 ~AtExitManager(); | |
| 45 | |
| 46 // Registers the specified function to be called at exit. The prototype of | |
| 47 // the callback function is void func(). | |
| 48 static void RegisterCallback(AtExitCallbackType func, void* param); | |
| 49 | |
| 50 // Calls the functions registered with RegisterCallback in LIFO order. It | |
| 51 // is possible to register new callbacks after calling this function. | |
| 52 static void ProcessCallbacksNow(); | |
| 53 | |
| 54 static bool AlreadyRegistered(); | |
| 55 | |
| 56 private: | |
| 57 struct CallbackAndParam { | |
| 58 CallbackAndParam(AtExitCallbackType func, void* param) | |
| 59 : func_(func), param_(param) { } | |
| 60 AtExitCallbackType func_; | |
| 61 void* param_; | |
| 62 }; | |
| 63 | |
| 64 Lock lock_; | |
| 65 std::stack<CallbackAndParam> stack_; | |
| 66 AtExitManager* next_manager_; // Stack of managers to allow shadowing. | |
| 67 | |
| 68 DISALLOW_COPY_AND_ASSIGN(AtExitManager); | |
| 69 }; | |
| 70 | |
| 71 } // namespace base | |
| 72 | |
| 73 #endif // BASE_AT_EXIT_H_ |
