yuzu/src/common/thread_worker.h
Morph 99ceb03a1c general: Convert source file copyright comments over to SPDX
This formats all copyright comments according to SPDX formatting guidelines.
Additionally, this resolves the remaining GPLv2 only licensed files by relicensing them to GPLv2.0-or-later.
2022-04-23 05:55:32 -04:00

117 lines
3.7 KiB
C++

// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <atomic>
#include <condition_variable>
#include <functional>
#include <mutex>
#include <stop_token>
#include <string>
#include <thread>
#include <type_traits>
#include <vector>
#include <queue>
#include "common/thread.h"
#include "common/unique_function.h"
namespace Common {
template <class StateType = void>
class StatefulThreadWorker {
static constexpr bool with_state = !std::is_same_v<StateType, void>;
struct DummyCallable {
int operator()() const noexcept {
return 0;
}
};
using Task =
std::conditional_t<with_state, UniqueFunction<void, StateType*>, UniqueFunction<void>>;
using StateMaker = std::conditional_t<with_state, std::function<StateType()>, DummyCallable>;
public:
explicit StatefulThreadWorker(size_t num_workers, std::string name, StateMaker func = {})
: workers_queued{num_workers}, thread_name{std::move(name)} {
const auto lambda = [this, func](std::stop_token stop_token) {
Common::SetCurrentThreadName(thread_name.c_str());
{
[[maybe_unused]] std::conditional_t<with_state, StateType, int> state{func()};
while (!stop_token.stop_requested()) {
Task task;
{
std::unique_lock lock{queue_mutex};
if (requests.empty()) {
wait_condition.notify_all();
}
condition.wait(lock, stop_token, [this] { return !requests.empty(); });
if (stop_token.stop_requested()) {
break;
}
task = std::move(requests.front());
requests.pop();
}
if constexpr (with_state) {
task(&state);
} else {
task();
}
++work_done;
}
}
++workers_stopped;
wait_condition.notify_all();
};
threads.reserve(num_workers);
for (size_t i = 0; i < num_workers; ++i) {
threads.emplace_back(lambda);
}
}
StatefulThreadWorker& operator=(const StatefulThreadWorker&) = delete;
StatefulThreadWorker(const StatefulThreadWorker&) = delete;
StatefulThreadWorker& operator=(StatefulThreadWorker&&) = delete;
StatefulThreadWorker(StatefulThreadWorker&&) = delete;
void QueueWork(Task work) {
{
std::unique_lock lock{queue_mutex};
requests.emplace(std::move(work));
++work_scheduled;
}
condition.notify_one();
}
void WaitForRequests(std::stop_token stop_token = {}) {
std::stop_callback callback(stop_token, [this] {
for (auto& thread : threads) {
thread.request_stop();
}
});
std::unique_lock lock{queue_mutex};
wait_condition.wait(lock, [this] {
return workers_stopped >= workers_queued || work_done >= work_scheduled;
});
}
private:
std::queue<Task> requests;
std::mutex queue_mutex;
std::condition_variable_any condition;
std::condition_variable wait_condition;
std::atomic<size_t> work_scheduled{};
std::atomic<size_t> work_done{};
std::atomic<size_t> workers_stopped{};
std::atomic<size_t> workers_queued{};
std::string thread_name;
std::vector<std::jthread> threads;
};
using ThreadWorker = StatefulThreadWorker<>;
} // namespace Common