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comparison: ipc/chromium/src/base/non_thread_safe.h
ipc/chromium/src/base/non_thread_safe.h
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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_NON_THREAD_SAFE_H__ | |
| 6 #define BASE_NON_THREAD_SAFE_H__ | |
| 7 | |
| 8 #include "base/platform_thread.h" | |
| 9 | |
| 10 // A helper class used to help verify that methods of a class are | |
| 11 // called from the same thread. One can inherit from this class and use | |
| 12 // CalledOnValidThread() to verify. | |
| 13 // | |
| 14 // This is intended to be used with classes that appear to be thread safe, but | |
| 15 // aren't. For example, a service or a singleton like the preferences system. | |
| 16 // | |
| 17 // Example: | |
| 18 // class MyClass : public NonThreadSafe { | |
| 19 // public: | |
| 20 // void Foo() { | |
| 21 // DCHECK(CalledOnValidThread()); | |
| 22 // ... (do stuff) ... | |
| 23 // } | |
| 24 // } | |
| 25 // | |
| 26 // In Release mode, CalledOnValidThread will always return true. | |
| 27 // | |
| 28 #ifndef NDEBUG | |
| 29 class NonThreadSafe { | |
| 30 public: | |
| 31 NonThreadSafe(); | |
| 32 ~NonThreadSafe(); | |
| 33 | |
| 34 bool CalledOnValidThread() const; | |
| 35 | |
| 36 private: | |
| 37 PlatformThreadId valid_thread_id_; | |
| 38 }; | |
| 39 #else | |
| 40 // Do nothing in release mode. | |
| 41 class NonThreadSafe { | |
| 42 public: | |
| 43 NonThreadSafe() {} | |
| 44 ~NonThreadSafe() {} | |
| 45 | |
| 46 bool CalledOnValidThread() const { | |
| 47 return true; | |
| 48 } | |
| 49 }; | |
| 50 #endif // NDEBUG | |
| 51 | |
| 52 #endif // BASE_NON_THREAD_SAFE_H__ |
