98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
/*
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* Copyright (c) 2017-2018 Arm Limited.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef __ARM_COMPUTE_UTILS_SEMAMPHORE_H__
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#define __ARM_COMPUTE_UTILS_SEMAMPHORE_H__
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#include "Mutex.h"
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#include "support/Mutex.h"
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#include <condition_variable>
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namespace arm_compute
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{
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#ifndef NO_MULTI_THREADING
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/** Semamphore class */
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class Semaphore
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{
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public:
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/** Default Constuctor
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*
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* @param[in] value Semaphore initial value
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*/
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Semaphore(int value = 0)
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: _value(value), _m(), _cv()
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{
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}
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/** Signals a semaphore */
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inline void signal()
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{
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{
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std::lock_guard<std::mutex> lock(_m);
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++_value;
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}
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_cv.notify_one();
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}
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/** Waits on a semaphore */
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inline void wait()
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{
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std::unique_lock<std::mutex> lock(_m);
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_cv.wait(lock, [this]()
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{
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return _value > 0;
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});
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--_value;
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}
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private:
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int _value;
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arm_compute::Mutex _m;
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std::condition_variable _cv;
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};
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#else /* NO_MULTI_THREADING */
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/** Empty semamphore class */
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class Semaphore
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{
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public:
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Semaphore(int value = 0)
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: _value(value)
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{
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(void)_value;
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}
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/** Signals a semaphore */
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inline void signal()
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{
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(void)_value;
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}
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/** Waits on a semaphore */
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inline void wait()
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{
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(void)_value;
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}
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private:
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int _value;
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};
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#endif /* NO_MULTI_THREADING */
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} // arm_compute
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#endif /* __ARM_COMPUTE_UTILS_SEMAMPHORE_H__ */
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