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Merge pull request #6563 from ReinUsesLisp/thread-worker
common: Add stateful thread worker and unique function utilities
This commit is contained in:
commit
975a7b3a78
@ -180,7 +180,6 @@ add_library(common STATIC
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thread.cpp
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thread.h
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thread_queue_list.h
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thread_worker.cpp
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thread_worker.h
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threadsafe_queue.h
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time_zone.cpp
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@ -188,6 +187,7 @@ add_library(common STATIC
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tiny_mt.h
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tree.h
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uint128.h
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unique_function.h
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uuid.cpp
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uuid.h
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vector_math.h
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@ -1,58 +0,0 @@
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// Copyright 2020 yuzu emulator team
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include "common/thread.h"
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#include "common/thread_worker.h"
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namespace Common {
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ThreadWorker::ThreadWorker(std::size_t num_workers, const std::string& name) {
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for (std::size_t i = 0; i < num_workers; ++i)
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threads.emplace_back([this, thread_name{std::string{name}}] {
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Common::SetCurrentThreadName(thread_name.c_str());
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// Wait for first request
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{
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std::unique_lock lock{queue_mutex};
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condition.wait(lock, [this] { return stop || !requests.empty(); });
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}
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while (true) {
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std::function<void()> task;
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{
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std::unique_lock lock{queue_mutex};
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condition.wait(lock, [this] { return stop || !requests.empty(); });
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if (stop || requests.empty()) {
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return;
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}
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task = std::move(requests.front());
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requests.pop();
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}
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task();
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}
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});
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}
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ThreadWorker::~ThreadWorker() {
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{
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std::unique_lock lock{queue_mutex};
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stop = true;
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}
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condition.notify_all();
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for (std::thread& thread : threads) {
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thread.join();
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}
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}
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void ThreadWorker::QueueWork(std::function<void()>&& work) {
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{
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std::unique_lock lock{queue_mutex};
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requests.emplace(work);
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}
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condition.notify_one();
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}
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} // namespace Common
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@ -7,24 +7,110 @@
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#include <atomic>
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#include <functional>
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#include <mutex>
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#include <stop_token>
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#include <string>
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#include <thread>
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#include <type_traits>
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#include <vector>
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#include <queue>
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#include "common/thread.h"
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#include "common/unique_function.h"
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namespace Common {
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class ThreadWorker final {
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template <class StateType = void>
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class StatefulThreadWorker {
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static constexpr bool with_state = !std::is_same_v<StateType, void>;
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struct DummyCallable {
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int operator()() const noexcept {
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return 0;
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}
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};
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using Task =
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std::conditional_t<with_state, UniqueFunction<void, StateType*>, UniqueFunction<void>>;
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using StateMaker = std::conditional_t<with_state, std::function<StateType()>, DummyCallable>;
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public:
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explicit ThreadWorker(std::size_t num_workers, const std::string& name);
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~ThreadWorker();
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void QueueWork(std::function<void()>&& work);
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explicit StatefulThreadWorker(size_t num_workers, std::string name, StateMaker func = {})
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: workers_queued{num_workers}, thread_name{std::move(name)} {
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const auto lambda = [this, func](std::stop_token stop_token) {
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Common::SetCurrentThreadName(thread_name.c_str());
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{
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std::conditional_t<with_state, StateType, int> state{func()};
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while (!stop_token.stop_requested()) {
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Task task;
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{
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std::unique_lock lock{queue_mutex};
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if (requests.empty()) {
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wait_condition.notify_all();
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}
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condition.wait(lock, stop_token, [this] { return !requests.empty(); });
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if (stop_token.stop_requested()) {
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break;
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}
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task = std::move(requests.front());
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requests.pop();
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}
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if constexpr (with_state) {
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task(&state);
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} else {
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task();
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}
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++work_done;
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}
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}
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++workers_stopped;
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wait_condition.notify_all();
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};
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threads.reserve(num_workers);
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for (size_t i = 0; i < num_workers; ++i) {
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threads.emplace_back(lambda);
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}
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}
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StatefulThreadWorker& operator=(const StatefulThreadWorker&) = delete;
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StatefulThreadWorker(const StatefulThreadWorker&) = delete;
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StatefulThreadWorker& operator=(StatefulThreadWorker&&) = delete;
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StatefulThreadWorker(StatefulThreadWorker&&) = delete;
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void QueueWork(Task work) {
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{
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std::unique_lock lock{queue_mutex};
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requests.emplace(std::move(work));
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++work_scheduled;
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}
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condition.notify_one();
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}
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void WaitForRequests(std::stop_token stop_token = {}) {
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std::stop_callback callback(stop_token, [this] {
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for (auto& thread : threads) {
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thread.request_stop();
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}
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});
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std::unique_lock lock{queue_mutex};
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wait_condition.wait(lock, [this] {
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return workers_stopped >= workers_queued || work_done >= work_scheduled;
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});
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}
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private:
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std::vector<std::thread> threads;
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std::queue<std::function<void()>> requests;
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std::queue<Task> requests;
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std::mutex queue_mutex;
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std::condition_variable condition;
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std::atomic_bool stop{};
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std::condition_variable_any condition;
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std::condition_variable wait_condition;
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std::atomic<size_t> work_scheduled{};
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std::atomic<size_t> work_done{};
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std::atomic<size_t> workers_stopped{};
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std::atomic<size_t> workers_queued{};
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std::string thread_name;
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std::vector<std::jthread> threads;
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};
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using ThreadWorker = StatefulThreadWorker<>;
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} // namespace Common
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62
src/common/unique_function.h
Normal file
62
src/common/unique_function.h
Normal file
@ -0,0 +1,62 @@
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// Copyright 2021 yuzu emulator team
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <memory>
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#include <utility>
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namespace Common {
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/// General purpose function wrapper similar to std::function.
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/// Unlike std::function, the captured values don't have to be copyable.
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/// This class can be moved but not copied.
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template <typename ResultType, typename... Args>
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class UniqueFunction {
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class CallableBase {
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public:
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virtual ~CallableBase() = default;
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virtual ResultType operator()(Args&&...) = 0;
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};
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template <typename Functor>
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class Callable final : public CallableBase {
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public:
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Callable(Functor&& functor_) : functor{std::move(functor_)} {}
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~Callable() override = default;
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ResultType operator()(Args&&... args) override {
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return functor(std::forward<Args>(args)...);
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}
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private:
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Functor functor;
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};
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public:
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UniqueFunction() = default;
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template <typename Functor>
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UniqueFunction(Functor&& functor)
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: callable{std::make_unique<Callable<Functor>>(std::move(functor))} {}
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UniqueFunction& operator=(UniqueFunction&& rhs) noexcept = default;
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UniqueFunction(UniqueFunction&& rhs) noexcept = default;
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UniqueFunction& operator=(const UniqueFunction&) = delete;
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UniqueFunction(const UniqueFunction&) = delete;
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ResultType operator()(Args&&... args) const {
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return (*callable)(std::forward<Args>(args)...);
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}
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explicit operator bool() const noexcept {
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return static_cast<bool>(callable);
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}
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private:
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std::unique_ptr<CallableBase> callable;
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};
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} // namespace Common
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@ -5,6 +5,7 @@ add_executable(tests
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common/host_memory.cpp
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common/param_package.cpp
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common/ring_buffer.cpp
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common/unique_function.cpp
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core/core_timing.cpp
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core/network/network.cpp
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tests.cpp
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src/tests/common/unique_function.cpp
Normal file
108
src/tests/common/unique_function.cpp
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@ -0,0 +1,108 @@
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// Copyright 2021 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <string>
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#include <catch2/catch.hpp>
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#include "common/unique_function.h"
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namespace {
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struct Noisy {
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Noisy() : state{"Default constructed"} {}
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Noisy(Noisy&& rhs) noexcept : state{"Move constructed"} {
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rhs.state = "Moved away";
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}
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Noisy& operator=(Noisy&& rhs) noexcept {
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state = "Move assigned";
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rhs.state = "Moved away";
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}
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Noisy(const Noisy&) : state{"Copied constructed"} {}
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Noisy& operator=(const Noisy&) {
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state = "Copied assigned";
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}
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std::string state;
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};
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} // Anonymous namespace
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TEST_CASE("UniqueFunction", "[common]") {
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SECTION("Capture reference") {
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int value = 0;
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Common::UniqueFunction<void> func = [&value] { value = 5; };
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func();
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REQUIRE(value == 5);
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}
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SECTION("Capture pointer") {
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int value = 0;
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int* pointer = &value;
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Common::UniqueFunction<void> func = [pointer] { *pointer = 5; };
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func();
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REQUIRE(value == 5);
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}
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SECTION("Move object") {
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Noisy noisy;
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REQUIRE(noisy.state == "Default constructed");
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Common::UniqueFunction<void> func = [noisy = std::move(noisy)] {
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REQUIRE(noisy.state == "Move constructed");
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};
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REQUIRE(noisy.state == "Moved away");
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func();
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}
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SECTION("Move construct function") {
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int value = 0;
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Common::UniqueFunction<void> func = [&value] { value = 5; };
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Common::UniqueFunction<void> new_func = std::move(func);
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new_func();
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REQUIRE(value == 5);
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}
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SECTION("Move assign function") {
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int value = 0;
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Common::UniqueFunction<void> func = [&value] { value = 5; };
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Common::UniqueFunction<void> new_func;
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new_func = std::move(func);
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new_func();
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REQUIRE(value == 5);
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}
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SECTION("Default construct then assign function") {
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int value = 0;
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Common::UniqueFunction<void> func;
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func = [&value] { value = 5; };
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func();
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REQUIRE(value == 5);
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}
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SECTION("Pass arguments") {
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int result = 0;
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Common::UniqueFunction<void, int, int> func = [&result](int a, int b) { result = a + b; };
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func(5, 4);
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REQUIRE(result == 9);
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}
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SECTION("Pass arguments and return value") {
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Common::UniqueFunction<int, int, int> func = [](int a, int b) { return a + b; };
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REQUIRE(func(5, 4) == 9);
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}
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SECTION("Destructor") {
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int num_destroyed = 0;
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struct Foo {
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Foo(int* num_) : num{num_} {}
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Foo(Foo&& rhs) : num{std::exchange(rhs.num, nullptr)} {}
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Foo(const Foo&) = delete;
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~Foo() {
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if (num) {
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++*num;
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}
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}
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int* num = nullptr;
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};
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Foo object{&num_destroyed};
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{
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Common::UniqueFunction<void> func = [object = std::move(object)] {};
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REQUIRE(num_destroyed == 0);
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}
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REQUIRE(num_destroyed == 1);
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}
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}
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