| 1 | /**************************************************************************/ |
| 2 | /* condition_variable.h */ |
| 3 | /**************************************************************************/ |
| 4 | /* This file is part of: */ |
| 5 | /* GODOT ENGINE */ |
| 6 | /* https://godotengine.org */ |
| 7 | /**************************************************************************/ |
| 8 | /* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */ |
| 9 | /* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */ |
| 10 | /* */ |
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| 17 | /* the following conditions: */ |
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| 20 | /* included in all copies or substantial portions of the Software. */ |
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| 22 | /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ |
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| 29 | /**************************************************************************/ |
| 30 | |
| 31 | #ifndef CONDITION_VARIABLE_H |
| 32 | #define CONDITION_VARIABLE_H |
| 33 | |
| 34 | #include <condition_variable> |
| 35 | |
| 36 | // An object one or multiple threads can wait on a be notified by some other. |
| 37 | // Normally, you want to use a semaphore for such scenarios, but when the |
| 38 | // condition is something different than a count being greater than zero |
| 39 | // (which is the built-in logic in a semaphore) or you want to provide your |
| 40 | // own mutex to tie the wait-notify to some other behavior, you need to use this. |
| 41 | |
| 42 | class ConditionVariable { |
| 43 | mutable std::condition_variable condition; |
| 44 | |
| 45 | public: |
| 46 | template <class BinaryMutexT> |
| 47 | _ALWAYS_INLINE_ void wait(const MutexLock<BinaryMutexT> &p_lock) const { |
| 48 | condition.wait(const_cast<std::unique_lock<std::mutex> &>(p_lock.lock)); |
| 49 | } |
| 50 | |
| 51 | _ALWAYS_INLINE_ void notify_one() const { |
| 52 | condition.notify_one(); |
| 53 | } |
| 54 | |
| 55 | _ALWAYS_INLINE_ void notify_all() const { |
| 56 | condition.notify_all(); |
| 57 | } |
| 58 | }; |
| 59 | |
| 60 | #endif // CONDITION_VARIABLE_H |
| 61 | |