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/*
* Copyright 2019 Xilinx Inc.
*
* 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
*
* http://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.
*/
#include <functional>
#include <future>
#include <memory>
#include <type_traits>
#include <vector>
#include "./erl_msg_box.hpp"
namespace vitis {
namespace ai {
class ThreadPool {
public:
static std::unique_ptr<ThreadPool> create(size_t num_of_threads);
#if __cplusplus > 201700
template <class Function, class... Args>
using result_t =
std::invoke_result_t<std::decay_t<Function>, std::decay_t<Args>...>;
#elif __cplusplus > 201400
template <class Function, class... Args>
using result_t =
std::result_of_t<std::decay_t<Function>(std::decay_t<Args>...)>;
#else
#error "not supported, c++14 or c++17 is needed."
#endif
template <class Function, class... Args>
std::future<result_t<Function, Args...>> async(Function&& f, Args&&... args) {
std::packaged_task<result_t<Function, Args...>()> task(
std::bind(std::forward<Function>(f), std::forward<Args>(args)...));
std::future<result_t<Function, Args...>> ret = task.get_future();
queue_.emplace_send(std::move(task));
return ret;
}
~ThreadPool();
private:
explicit ThreadPool(size_t num_of_thread);
private:
static void thread_main(ThreadPool* self);
private:
std::vector<std::thread> pool_;
vitis::ai::ErlMsgBox<std::packaged_task<void()>> queue_;
int running_;
private:
/// thanks akk
/// https://stackoverflow.com/questions/20843271/passing-a-non-copyable-closure-object-to-stdfunction-parameter
template <class F>
auto make_copyable_function(F&& f) {
using dF = std::decay_t<F>;
auto spf = std::make_shared<dF>(std::forward<F>(f));
return [spf](auto&&... args) -> decltype(auto) {
return (*spf)(decltype(args)(args)...);
};
}
};
} // namespace ai
} // namespace vitis
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