57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
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/*
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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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class Semaphore {
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public:
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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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#endif // LIBMEMUNREACHABLE_SEMAPHORE_H_
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