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common/thread_worker: Add support for stateful threads

This commit is contained in:
ReinUsesLisp 2021-05-25 20:37:06 -03:00
parent c147e9a90e
commit da34d37044
3 changed files with 86 additions and 78 deletions

View file

@ -180,7 +180,6 @@ add_library(common STATIC
thread.cpp
thread.h
thread_queue_list.h
thread_worker.cpp
thread_worker.h
threadsafe_queue.h
time_zone.cpp

View file

@ -1,66 +0,0 @@
// Copyright 2020 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/thread.h"
#include "common/thread_worker.h"
namespace Common {
ThreadWorker::ThreadWorker(std::size_t num_workers, const std::string& name) {
workers_queued.store(static_cast<u64>(num_workers), std::memory_order_release);
const auto lambda = [this, thread_name{std::string{name}}] {
Common::SetCurrentThreadName(thread_name.c_str());
while (!stop) {
UniqueFunction<void> task;
{
std::unique_lock lock{queue_mutex};
if (requests.empty()) {
wait_condition.notify_all();
}
condition.wait(lock, [this] { return stop || !requests.empty(); });
if (stop) {
break;
}
task = std::move(requests.front());
requests.pop();
}
task();
work_done++;
}
workers_stopped++;
wait_condition.notify_all();
};
for (size_t i = 0; i < num_workers; ++i) {
threads.emplace_back(lambda);
}
}
ThreadWorker::~ThreadWorker() {
{
std::unique_lock lock{queue_mutex};
stop = true;
}
condition.notify_all();
for (std::thread& thread : threads) {
thread.join();
}
}
void ThreadWorker::QueueWork(UniqueFunction<void> work) {
{
std::unique_lock lock{queue_mutex};
requests.emplace(std::move(work));
work_scheduled++;
}
condition.notify_one();
}
void ThreadWorker::WaitForRequests() {
std::unique_lock lock{queue_mutex};
wait_condition.wait(
lock, [this] { return workers_stopped >= workers_queued || work_done >= work_scheduled; });
}
} // namespace Common

View file

@ -8,32 +8,107 @@
#include <functional>
#include <mutex>
#include <string>
#include <type_traits>
#include <vector>
#include <queue>
#include "common/common_types.h"
#include "common/thread.h"
#include "common/unique_function.h"
namespace Common {
class ThreadWorker final {
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 ThreadWorker(std::size_t num_workers, const std::string& name);
~ThreadWorker();
void QueueWork(UniqueFunction<void> work);
void WaitForRequests();
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] {
Common::SetCurrentThreadName(thread_name.c_str());
{
std::conditional_t<with_state, StateType, int> state{func()};
while (!stop) {
Task task;
{
std::unique_lock lock{queue_mutex};
if (requests.empty()) {
wait_condition.notify_all();
}
condition.wait(lock, [this] { return stop || !requests.empty(); });
if (stop) {
break;
}
task = std::move(requests.front());
requests.pop();
}
if constexpr (with_state) {
task(&state);
} else {
task();
}
++work_done;
}
}
++workers_stopped;
wait_condition.notify_all();
};
for (size_t i = 0; i < num_workers; ++i) {
threads.emplace_back(lambda);
}
}
~StatefulThreadWorker() {
{
std::unique_lock lock{queue_mutex};
stop = true;
}
condition.notify_all();
for (std::thread& thread : threads) {
thread.join();
}
}
void QueueWork(Task work) {
{
std::unique_lock lock{queue_mutex};
requests.emplace(std::move(work));
++work_scheduled;
}
condition.notify_one();
}
void WaitForRequests() {
std::unique_lock lock{queue_mutex};
wait_condition.wait(lock, [this] {
return workers_stopped >= workers_queued || work_done >= work_scheduled;
});
}
private:
std::vector<std::thread> threads;
std::queue<UniqueFunction<void>> requests;
std::queue<Task> requests;
std::mutex queue_mutex;
std::condition_variable condition;
std::condition_variable wait_condition;
std::atomic_bool stop{};
std::atomic<u64> work_scheduled{};
std::atomic<u64> work_done{};
std::atomic<u64> workers_stopped{};
std::atomic<u64> workers_queued{};
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;
};
using ThreadWorker = StatefulThreadWorker<>;
} // namespace Common