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comparison: security/sandbox/chromium/base/at_exit.h
security/sandbox/chromium/base/at_exit.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:eae3afba6cb5 |
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| 1 // Copyright (c) 2011 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/base_export.h" | |
| 11 #include "base/basictypes.h" | |
| 12 #include "base/callback.h" | |
| 13 #include "base/synchronization/lock.h" | |
| 14 | |
| 15 namespace base { | |
| 16 | |
| 17 // This class provides a facility similar to the CRT atexit(), except that | |
| 18 // we control when the callbacks are executed. Under Windows for a DLL they | |
| 19 // happen at a really bad time and under the loader lock. This facility is | |
| 20 // mostly used by base::Singleton. | |
| 21 // | |
| 22 // The usage is simple. Early in the main() or WinMain() scope create an | |
| 23 // AtExitManager object on the stack: | |
| 24 // int main(...) { | |
| 25 // base::AtExitManager exit_manager; | |
| 26 // | |
| 27 // } | |
| 28 // When the exit_manager object goes out of scope, all the registered | |
| 29 // callbacks and singleton destructors will be called. | |
| 30 | |
| 31 class BASE_EXPORT AtExitManager { | |
| 32 public: | |
| 33 typedef void (*AtExitCallbackType)(void*); | |
| 34 | |
| 35 AtExitManager(); | |
| 36 | |
| 37 // The dtor calls all the registered callbacks. Do not try to register more | |
| 38 // callbacks after this point. | |
| 39 ~AtExitManager(); | |
| 40 | |
| 41 // Registers the specified function to be called at exit. The prototype of | |
| 42 // the callback function is void func(void*). | |
| 43 static void RegisterCallback(AtExitCallbackType func, void* param); | |
| 44 | |
| 45 // Registers the specified task to be called at exit. | |
| 46 static void RegisterTask(base::Closure task); | |
| 47 | |
| 48 // Calls the functions registered with RegisterCallback in LIFO order. It | |
| 49 // is possible to register new callbacks after calling this function. | |
| 50 static void ProcessCallbacksNow(); | |
| 51 | |
| 52 protected: | |
| 53 // This constructor will allow this instance of AtExitManager to be created | |
| 54 // even if one already exists. This should only be used for testing! | |
| 55 // AtExitManagers are kept on a global stack, and it will be removed during | |
| 56 // destruction. This allows you to shadow another AtExitManager. | |
| 57 explicit AtExitManager(bool shadow); | |
| 58 | |
| 59 private: | |
| 60 base::Lock lock_; | |
| 61 std::stack<base::Closure> stack_; | |
| 62 AtExitManager* next_manager_; // Stack of managers to allow shadowing. | |
| 63 | |
| 64 DISALLOW_COPY_AND_ASSIGN(AtExitManager); | |
| 65 }; | |
| 66 | |
| 67 #if defined(UNIT_TEST) | |
| 68 class ShadowingAtExitManager : public AtExitManager { | |
| 69 public: | |
| 70 ShadowingAtExitManager() : AtExitManager(true) {} | |
| 71 }; | |
| 72 #endif // defined(UNIT_TEST) | |
| 73 | |
| 74 } // namespace base | |
| 75 | |
| 76 #endif // BASE_AT_EXIT_H_ |
