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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef dap_chan_h
#define dap_chan_h
#include "dap/optional.h"
#include <condition_variable>
#include <mutex>
#include <queue>
namespace dap {
template <typename T>
struct Chan {
public:
void reset();
void close();
optional<T> take();
void put(T&& in);
void put(const T& in);
private:
bool closed = false;
std::queue<T> queue;
std::condition_variable cv;
std::mutex mutex;
};
template <typename T>
void Chan<T>::reset() {
std::unique_lock<std::mutex> lock(mutex);
queue = {};
closed = false;
}
template <typename T>
void Chan<T>::close() {
std::unique_lock<std::mutex> lock(mutex);
closed = true;
cv.notify_all();
}
template <typename T>
optional<T> Chan<T>::take() {
std::unique_lock<std::mutex> lock(mutex);
cv.wait(lock, [&] { return queue.size() > 0 || closed; });
if (queue.size() == 0) {
return optional<T>();
}
auto out = std::move(queue.front());
queue.pop();
return optional<T>(std::move(out));
}
template <typename T>
void Chan<T>::put(T&& in) {
std::unique_lock<std::mutex> lock(mutex);
auto notify = queue.size() == 0 && !closed;
queue.push(std::move(in));
if (notify) {
cv.notify_all();
}
}
template <typename T>
void Chan<T>::put(const T& in) {
std::unique_lock<std::mutex> lock(mutex);
auto notify = queue.size() == 0 && !closed;
queue.push(in);
if (notify) {
cv.notify_all();
}
}
} // namespace dap
#endif // dap_chan_h
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