| /* |
| * Copyright (c) 2017-2018 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::lock_guard<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) |
| { |
| (void)_value; |
| } |
| /** Signals a semaphore */ |
| inline void signal() |
| { |
| (void)_value; |
| } |
| /** Waits on a semaphore */ |
| inline void wait() |
| { |
| (void)_value; |
| } |
| |
| private: |
| int _value; |
| }; |
| #endif /* NO_MULTI_THREADING */ |
| } // arm_compute |
| #endif /* __ARM_COMPUTE_UTILS_SEMAMPHORE_H__ */ |