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96 lines
2.3 KiB
C++
96 lines
2.3 KiB
C++
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
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// with the License. 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 distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License.
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#pragma once
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#include <assert.h>
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#include <condition_variable>
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#include <iostream>
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#include <queue>
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#include <vector>
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namespace milvus {
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template <typename T>
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class BlockingQueue {
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public:
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BlockingQueue() : mtx(), full_(), empty_() {
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}
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virtual ~BlockingQueue() {
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}
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BlockingQueue(const BlockingQueue& rhs) = delete;
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BlockingQueue&
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operator=(const BlockingQueue& rhs) = delete;
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void
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Put(const T& task) {
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std::unique_lock<std::mutex> lock(mtx);
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full_.wait(lock, [this] { return (queue_.size() < capacity_); });
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queue_.push(task);
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empty_.notify_all();
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}
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T
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Take() {
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std::unique_lock<std::mutex> lock(mtx);
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empty_.wait(lock, [this] { return !queue_.empty(); });
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T front(queue_.front());
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queue_.pop();
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full_.notify_all();
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return front;
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}
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T
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Front() {
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std::unique_lock<std::mutex> lock(mtx);
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empty_.wait(lock, [this] { return !queue_.empty(); });
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T front(queue_.front());
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return front;
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}
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T
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Back() {
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std::unique_lock<std::mutex> lock(mtx);
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empty_.wait(lock, [this] { return !queue_.empty(); });
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T back(queue_.back());
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return back;
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}
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size_t
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Size() const {
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std::lock_guard<std::mutex> lock(mtx);
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return queue_.size();
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}
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bool
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Empty() const {
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std::unique_lock<std::mutex> lock(mtx);
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return queue_.empty();
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}
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void
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SetCapacity(const size_t capacity) {
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capacity_ = (capacity > 0 ? capacity : capacity_);
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}
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protected:
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mutable std::mutex mtx;
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std::condition_variable full_;
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std::condition_variable empty_;
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std::queue<T> queue_;
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size_t capacity_ = 32;
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};
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} // namespace milvus
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