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72 lines
1.9 KiB
72 lines
1.9 KiB
2 years ago
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// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
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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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#include "base/common.h"
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namespace ppspeech {
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template <typename T>
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class SafeQueue {
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public:
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explicit SafeQueue(size_t capacity = 0);
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void push_back(const T& in);
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bool pop(T* out);
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bool empty() const { return buffer_.empty(); }
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size_t size() const { return buffer_.size(); }
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void clear();
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private:
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std::mutex mutex_;
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std::condition_variable condition_;
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std::deque<T> buffer_;
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size_t capacity_;
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};
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template <typename T>
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SafeQueue<T>::SafeQueue(size_t capacity) : capacity_(capacity) {}
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template <typename T>
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void SafeQueue<T>::push_back(const T& in) {
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std::unique_lock<std::mutex> lock(mutex_);
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if (capacity_ > 0 && buffer_.size() == capacity_) {
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condition_.wait(lock, [this] { return capacity_ >= buffer_.size(); });
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}
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buffer_.push_back(in);
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condition_.notify_one();
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}
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template <typename T>
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bool SafeQueue<T>::pop(T* out) {
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if (buffer_.empty()) {
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return false;
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}
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std::unique_lock<std::mutex> lock(mutex_);
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condition_.wait(lock, [this] { return buffer_.size() > 0; });
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*out = std::move(buffer_.front());
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buffer_.pop_front();
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condition_.notify_one();
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return true;
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}
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template <typename T>
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void SafeQueue<T>::clear() {
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std::unique_lock<std::mutex> lock(mutex_);
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buffer_.clear();
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condition_.notify_one();
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}
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} // namespace ppspeech
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