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Diffstat (limited to 'support/Semaphore.h')
-rw-r--r-- | support/Semaphore.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/support/Semaphore.h b/support/Semaphore.h new file mode 100644 index 0000000000..6cdf196dee --- /dev/null +++ b/support/Semaphore.h @@ -0,0 +1,92 @@ +/* + * Copyright (c) 2017 ARM Limited. + * + * SPDX-License-Identifier: MIT + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to + * deal in the Software without restriction, including without limitation the + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ +#ifndef __ARM_COMPUTE_UTILS_SEMAMPHORE_H__ +#define __ARM_COMPUTE_UTILS_SEMAMPHORE_H__ + +#include "Mutex.h" +#include "support/Mutex.h" +#include <condition_variable> + +namespace arm_compute +{ +#ifndef NO_MULTI_THREADING +/** Semamphore class */ +class Semaphore +{ +public: + /** Default Constuctor + * + * @param[in] value Semaphore initial value + */ + Semaphore(int value = 0) + : _value(value), _m(), _cv() + { + } + /** Signals a semaphore */ + inline void signal() + { + std::unique_lock<std::mutex> lock(_m); + ++_value; + _cv.notify_one(); + } + /** Waits on a semaphore */ + inline void wait() + { + std::unique_lock<std::mutex> lock(_m); + _cv.wait(lock, [this]() + { + return _value > 0; + }); + --_value; + } + +private: + int _value; + arm_compute::Mutex _m; + std::condition_variable _cv; +}; +#else /* NO_MULTI_THREADING */ +/** Empty semamphore class */ +class Semaphore +{ +public: + Semaphore(int value = 0) + : _value(value) + { + } + /** Signals a semaphore */ + inline void signal() + { + } + /** Waits on a semaphore */ + inline void wait() + { + } + +private: + int _value; +}; +#endif /* NO_MULTI_THREADING */ +} // arm_compute +#endif /* __ARM_COMPUTE_UTILS_SEMAMPHORE_H__ */ |