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60 lines
1.4 KiB
60 lines
1.4 KiB
/* |
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* Copyright (C) 2016 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#ifndef LIBMEMUNREACHABLE_SEMAPHORE_H_ |
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#define LIBMEMUNREACHABLE_SEMAPHORE_H_ |
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#include <chrono> |
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#include <mutex> |
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#include "android-base/macros.h" |
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namespace android { |
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class Semaphore { |
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public: |
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explicit Semaphore(int count = 0) : count_(count) {} |
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~Semaphore() = default; |
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void Wait(std::chrono::milliseconds ms) { |
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std::unique_lock<std::mutex> lk(m_); |
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cv_.wait_for(lk, ms, [&] { |
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if (count_ > 0) { |
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count_--; |
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return true; |
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} |
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return false; |
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}); |
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} |
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void Post() { |
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{ |
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std::lock_guard<std::mutex> lk(m_); |
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count_++; |
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} |
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cv_.notify_one(); |
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} |
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private: |
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DISALLOW_COPY_AND_ASSIGN(Semaphore); |
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int count_; |
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std::mutex m_; |
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std::condition_variable cv_; |
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}; |
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} // namespace android |
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#endif // LIBMEMUNREACHABLE_SEMAPHORE_H_
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