749 lines
22 KiB
C++
749 lines
22 KiB
C++
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#pragma once
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#ifndef MIJIN_ASYNC_COROUTINE_HPP_INCLUDED
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#define MIJIN_ASYNC_COROUTINE_HPP_INCLUDED 1
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#include <any>
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#include <coroutine>
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#include <memory>
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#include <thread>
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#include <tuple>
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#include "./future.hpp"
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#include "./message_queue.hpp"
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#include "../container/optional.hpp"
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#include "../util/flag.hpp"
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#include "../util/traits.hpp"
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namespace mijin
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{
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//
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// public defines
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//
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#if !defined(MIJIN_COROUTINE_ENABLE_DEBUG_INFO)
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#define MIJIN_COROUTINE_ENABLE_DEBUG_INFO 0
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#endif
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//
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// public types
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//
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enum class TaskStatus
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{
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SUSPENDED = 0,
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RUNNING = 1,
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WAITING = 2,
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FINISHED = 3,
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YIELDED = 4
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};
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// forward declarations
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template<typename T>
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struct TaskState;
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class TaskLoop;
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template<typename TResult = void>
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class TaskBase;
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namespace impl
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{
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struct TaskCancelled : std::exception {};
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inline void throwIfCancelled();
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} // namespace impl
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template<typename T>
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struct TaskState
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{
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Optional<T> value;
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std::exception_ptr exception;
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TaskStatus status = TaskStatus::SUSPENDED;
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TaskState() = default;
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TaskState(const TaskState&) = default;
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TaskState(TaskState&&) noexcept = default;
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inline TaskState(T _value, TaskStatus _status) noexcept : value(std::move(_value)), status(_status) {}
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inline TaskState(std::exception_ptr _exception) noexcept : exception(std::move(_exception)), status(TaskStatus::FINISHED) {}
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TaskState& operator=(const TaskState&) = default;
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TaskState& operator=(TaskState&&) noexcept = default;
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};
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template<>
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struct TaskState<void>
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{
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std::exception_ptr exception;
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TaskStatus status = TaskStatus::SUSPENDED;
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TaskState() = default;
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TaskState(const TaskState&) = default;
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TaskState(TaskState&&) noexcept = default;
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inline TaskState(TaskStatus _status) noexcept : status(_status) {}
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inline TaskState(std::exception_ptr _exception) noexcept : exception(std::move(_exception)), status(TaskStatus::FINISHED) {}
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TaskState& operator=(const TaskState&) = default;
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TaskState& operator=(TaskState&&) noexcept = default;
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};
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namespace impl
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{
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template<typename TReturn, typename TPromise>
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struct TaskReturn
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{
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template<typename... TArgs>
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constexpr void return_value(TArgs&&... args) noexcept {
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(static_cast<TPromise&>(*this).state_) = TaskState<TReturn>(TReturn(std::forward<TArgs>(args)...), TaskStatus::FINISHED);
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}
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constexpr void return_value(TReturn value) noexcept {
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(static_cast<TPromise&>(*this).state_) = TaskState<TReturn>(TReturn(std::move(value)), TaskStatus::FINISHED);
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}
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constexpr void unhandled_exception() noexcept {
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(static_cast<TPromise&>(*this).state_) = TaskState<TReturn>(std::current_exception());
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}
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};
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template<typename TPromise>
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struct TaskReturn<void, TPromise>
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{
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constexpr void return_void() noexcept {
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static_cast<TPromise&>(*this).state_.status = TaskStatus::FINISHED;
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}
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constexpr void unhandled_exception() noexcept {
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(static_cast<TPromise&>(*this).state_) = TaskState<void>(std::current_exception());
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}
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};
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}
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template<typename TValue>
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struct TaskAwaitableFuture
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{
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FuturePtr<TValue> future;
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[[nodiscard]] constexpr bool await_ready() const noexcept { return future->ready(); }
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constexpr void await_suspend(std::coroutine_handle<>) const noexcept {}
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constexpr TValue await_resume() const noexcept
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{
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impl::throwIfCancelled();
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if constexpr (std::is_same_v<TValue, void>) {
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return;
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}
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else {
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return std::move(future->get());
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}
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}
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};
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template<typename... TArgs>
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struct TaskAwaitableSignal
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{
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std::shared_ptr<std::tuple<TArgs...>> data;
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[[nodiscard]] constexpr bool await_ready() const noexcept { return false; }
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constexpr void await_suspend(std::coroutine_handle<>) const noexcept {}
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inline auto& await_resume() const
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{
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impl::throwIfCancelled();
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return *data;
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}
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};
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template<typename TSingleArg>
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struct TaskAwaitableSignal<TSingleArg>
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{
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std::shared_ptr<TSingleArg> data;
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[[nodiscard]] constexpr bool await_ready() const noexcept { return false; }
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constexpr void await_suspend(std::coroutine_handle<>) const noexcept {}
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constexpr auto& await_resume() const
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{
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impl::throwIfCancelled();
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return *data;
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}
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};
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template<>
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struct TaskAwaitableSignal<>
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{
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[[nodiscard]] constexpr bool await_ready() const noexcept { return false; }
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constexpr void await_suspend(std::coroutine_handle<>) const noexcept {}
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inline void await_resume() const {
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impl::throwIfCancelled();
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}
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};
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struct TaskAwaitableSuspend
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{
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[[nodiscard]] constexpr bool await_ready() const noexcept { return false; }
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constexpr void await_suspend(std::coroutine_handle<>) const noexcept {}
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inline void await_resume() const {
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impl::throwIfCancelled();
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}
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};
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template<typename TTraits>
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struct TaskPromise : impl::TaskReturn<typename TTraits::result_t, TaskPromise<TTraits>>
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{
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using handle_t = std::coroutine_handle<TaskPromise>;
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using task_t = typename TTraits::task_t;
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using result_t = typename TTraits::result_t;
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TaskState<result_t> state_;
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TaskLoop* loop_ = nullptr;
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constexpr task_t get_return_object() noexcept { return task_t(handle_t::from_promise(*this)); }
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constexpr std::suspend_always initial_suspend() noexcept { return {}; }
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constexpr std::suspend_always final_suspend() noexcept { return {}; }
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// template<typename TValue>
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// constexpr std::suspend_always yield_value(TValue value) noexcept {
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// *state_ = TaskState<result_t>(std::move(value), TaskStatus::YIELDED);
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// return {};
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// }
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// TODO: implement yielding (can't use futures for this)
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// constexpr void unhandled_exception() noexcept {}
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template<typename TValue>
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auto await_transform(FuturePtr<TValue> future) noexcept
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{
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MIJIN_ASSERT(loop_ != nullptr, "Cannot await future outside of a loop!");
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TaskAwaitableFuture<TValue> awaitable{future};
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if (!awaitable.await_ready())
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{
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state_.status = TaskStatus::WAITING;
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future->sigSet.connect([this, future]() mutable
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{
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state_.status = TaskStatus::SUSPENDED;
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}, Oneshot::YES);
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}
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return awaitable;
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}
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template<typename TResultOther>
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auto await_transform(TaskBase<TResultOther> task) noexcept
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{
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MIJIN_ASSERT(loop_ != nullptr, "Cannot await another task outside of a loop!");
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auto future = delayEvaluation<TResultOther>(loop_)->addTask(std::move(task)); // hackidyhack: delay evaluation of the type of loop_ as it is only forward-declared here
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return await_transform(future);
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}
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template<typename TFirstArg, typename TSecondArg, typename... TArgs>
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auto await_transform(Signal<TFirstArg, TSecondArg, TArgs...>& signal) noexcept
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{
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auto data = std::make_shared<std::tuple<TFirstArg, TSecondArg, TArgs...>>();
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signal.connect([this, data](TFirstArg arg0, TSecondArg arg1, TArgs... args) mutable
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{
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*data = std::make_tuple(std::move(arg0), std::move(arg1), std::move(args)...);
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state_.status = TaskStatus::SUSPENDED;
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}, Oneshot::YES);
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TaskAwaitableSignal<TFirstArg, TSecondArg, TArgs...> awaitable{data};
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state_.status = TaskStatus::WAITING;
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return awaitable;
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}
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template<typename TFirstArg>
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auto await_transform(Signal<TFirstArg>& signal) noexcept
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{
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auto data = std::make_shared<TFirstArg>();
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signal.connect([this, data](TFirstArg arg0) mutable
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{
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*data = std::move(arg0);
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state_.status = TaskStatus::SUSPENDED;
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}, Oneshot::YES);
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TaskAwaitableSignal<TFirstArg> awaitable{data};
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state_.status = TaskStatus::WAITING;
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return awaitable;
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}
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auto await_transform(Signal<>& signal) noexcept
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{
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signal.connect([this]()
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{
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state_.status = TaskStatus::SUSPENDED;
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}, Oneshot::YES);
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TaskAwaitableSignal<> awaitable{};
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state_.status = TaskStatus::WAITING;
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return awaitable;
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}
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std::suspend_always await_transform(std::suspend_always) noexcept
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{
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state_.status = TaskStatus::SUSPENDED;
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return std::suspend_always();
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}
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std::suspend_never await_transform(std::suspend_never) noexcept {
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return std::suspend_never();
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}
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TaskAwaitableSuspend await_transform(TaskAwaitableSuspend) noexcept
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{
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state_.status = TaskStatus::SUSPENDED;
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return TaskAwaitableSuspend();
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}
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};
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template<typename TResult>
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class TaskBase
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{
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public:
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using task_t = TaskBase;
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using result_t = TResult;
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struct Traits
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{
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using task_t = TaskBase;
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using result_t = TResult;
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};
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public:
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using promise_type = TaskPromise<Traits>;
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using handle_t = typename promise_type::handle_t;
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private:
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handle_t handle_;
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public:
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constexpr explicit TaskBase(handle_t handle) noexcept : handle_(handle) {}
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TaskBase(const TaskBase&) = delete;
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TaskBase(TaskBase&& other) noexcept : handle_(std::exchange(other.handle_, nullptr)) {}
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~TaskBase() noexcept;
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public:
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TaskBase& operator=(const TaskBase&) = default;
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TaskBase& operator=(TaskBase&& other) noexcept = default;
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[[nodiscard]]
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constexpr bool operator==(const TaskBase& other) const noexcept { return handle_ == other.handle_; }
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[[nodiscard]]
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constexpr bool operator!=(const TaskBase& other) const noexcept { return handle_ != other.handle_; }
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public:
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[[nodiscard]]
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constexpr TaskState<TResult>& state() noexcept
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{
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return handle_.promise().state_;
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}
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constexpr TaskState<TResult>& resume()
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{
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state().status = TaskStatus::RUNNING;
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handle_.resume();
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return state();
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}
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private:
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[[nodiscard]]
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constexpr handle_t handle() const noexcept { return handle_; }
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[[nodiscard]]
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constexpr TaskLoop* getLoop() noexcept
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{
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return handle_.promise().loop_;
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}
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constexpr void setLoop(TaskLoop* loop) noexcept
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{
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// MIJIN_ASSERT(handle_.promise().loop_ == nullptr
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// || handle_.promise().loop_ == loop
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// || loop == nullptr, "Task already has a loop assigned!");
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handle_.promise().loop_ = loop;
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}
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friend class TaskLoop;
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template<typename TTask>
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friend class WrappedTask;
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};
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class WrappedTaskBase
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{
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public:
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virtual ~WrappedTaskBase() = default;
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public:
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virtual TaskStatus status() noexcept = 0;
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virtual std::exception_ptr exception() noexcept = 0;
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// virtual std::any result() noexcept = 0;
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virtual void resume() = 0;
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virtual void* raw() noexcept = 0;
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virtual std::coroutine_handle<> handle() noexcept = 0;
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virtual void setLoop(TaskLoop* loop) noexcept = 0;
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[[nodiscard]] inline bool canResume() {
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const TaskStatus stat = status();
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return (stat == TaskStatus::SUSPENDED || stat == TaskStatus::YIELDED);
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}
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};
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template<typename TTask>
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class WrappedTask : public WrappedTaskBase
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{
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private:
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TTask task_;
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public:
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constexpr explicit WrappedTask(TTask&& task) noexcept : task_(std::move(task)) {}
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WrappedTask(const WrappedTask&) = delete;
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WrappedTask(WrappedTask&&) noexcept = default;
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public:
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WrappedTask& operator=(const WrappedTask&) = delete;
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WrappedTask& operator=(WrappedTask&&) noexcept = default;
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public:
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TaskStatus status() noexcept override { return task_.state().status; }
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std::exception_ptr exception() noexcept override { return task_.state().exception; }
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// std::any result() noexcept override
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// {
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// if constexpr (std::is_same_v<typename TTask::result_t, void>) {
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// return {};
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// }
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// else {
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// return std::any(task_.state().value);
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// }
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// }
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void resume() override { task_.resume(); }
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void* raw() noexcept override { return &task_; }
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std::coroutine_handle<> handle() noexcept override { return task_.handle(); }
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void setLoop(TaskLoop* loop) noexcept override { task_.setLoop(loop); }
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};
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struct TaskSharedState
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{
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std::atomic_bool cancelled_ = false;
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};
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class TaskHandle
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{
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private:
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std::weak_ptr<TaskSharedState> state_;
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public:
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TaskHandle() = default;
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explicit TaskHandle(std::weak_ptr<TaskSharedState> state) noexcept : state_(std::move(state)) {}
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TaskHandle(const TaskHandle&) = default;
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TaskHandle(TaskHandle&&) = default;
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TaskHandle& operator=(const TaskHandle&) = default;
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TaskHandle& operator=(TaskHandle&&) = default;
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[[nodiscard]] bool isValid() const noexcept
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{
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return !state_.expired();
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}
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void cancel() const noexcept
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{
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if (std::shared_ptr<TaskSharedState> state = state_.lock())
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{
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state->cancelled_ = true;
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}
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}
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};
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template<typename TTask>
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std::unique_ptr<WrappedTask<TTask>> wrapTask(TTask&& task) noexcept
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{
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return std::make_unique<WrappedTask<TTask>>(std::forward<TTask>(task));
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}
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class TaskLoop
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{
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public:
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MIJIN_DEFINE_FLAG(CanContinue);
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MIJIN_DEFINE_FLAG(IgnoreWaiting);
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using wrapped_task_t = WrappedTaskBase;
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using wrapped_task_base_ptr_t = std::unique_ptr<wrapped_task_t>;
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struct StoredTask
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{
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std::shared_ptr<TaskSharedState> sharedState;
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wrapped_task_base_ptr_t task;
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std::function<void(StoredTask&)> setFuture;
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std::any resultData;
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};
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protected:
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using task_vector_t = std::vector<StoredTask>;
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template<typename TTask>
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using wrapped_task_ptr_t = std::unique_ptr<WrappedTask<TTask>>;
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public:
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TaskLoop() = default;
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TaskLoop(const TaskLoop&) = delete;
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TaskLoop(TaskLoop&&) = delete;
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virtual ~TaskLoop() = default;
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TaskLoop& operator=(const TaskLoop&) = delete;
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TaskLoop& operator=(TaskLoop&&) = delete;
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template<typename TResult>
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inline FuturePtr<TResult> addTask(TaskBase<TResult> task, TaskHandle* outHandle = nullptr) noexcept;
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virtual void transferCurrentTask(TaskLoop& otherLoop) noexcept = 0;
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virtual void addStoredTask(StoredTask&& storedTask) noexcept = 0;
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[[nodiscard]] static TaskLoop& current() noexcept;
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protected:
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inline TaskStatus tickTask(StoredTask& task) noexcept;
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protected:
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static inline TaskLoop*& currentLoopStorage() noexcept;
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template<typename TResult>
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static inline void setFutureHelper(StoredTask& storedTask) noexcept;
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};
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template<typename TResult = void>
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using Task = TaskBase<TResult>;
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class SimpleTaskLoop : public TaskLoop
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{
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private:
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task_vector_t tasks_;
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task_vector_t newTasks_;
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task_vector_t::iterator currentTask_;
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MessageQueue<StoredTask> queuedTasks_;
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std::thread::id threadId_;
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public: // TaskLoop implementation
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void transferCurrentTask(TaskLoop& otherLoop) noexcept override;
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void addStoredTask(StoredTask&& storedTask) noexcept override;
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public: // public interface
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[[nodiscard]] constexpr bool empty() const noexcept { return tasks_.empty() && newTasks_.empty(); }
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inline CanContinue tick() noexcept;
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inline void runUntilDone(IgnoreWaiting ignoreWaiting = IgnoreWaiting::NO) noexcept;
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private:
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inline void assertCorrectThread() { MIJIN_ASSERT(threadId_ == std::thread::id() || threadId_ == std::this_thread::get_id(), "Unsafe to TaskLoop from different thread!"); }
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};
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class MultiThreadedTaskLoop : public TaskLoop
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{
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private:
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task_vector_t parkedTasks_; // buffer for tasks that don't fit into readyTasks_
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MessageQueue<StoredTask> queuedTasks_; // tasks that should be appended to parked tasks
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MessageQueue<StoredTask> readyTasks_; // task queue to send tasks to a worker thread
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MessageQueue<StoredTask> returningTasks_; // task that have executed on a worker thread and return for further processing
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std::jthread managerThread_;
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std::vector<std::jthread> workerThreads_;
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public: // TaskLoop implementation
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void transferCurrentTask(TaskLoop& otherLoop) noexcept override;
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void addStoredTask(StoredTask&& storedTask) noexcept override;
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public: // public interface
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void start(std::size_t numWorkerThreads);
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void stop();
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private: // private stuff
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void managerThread(std::stop_token stopToken);
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void workerThread(std::stop_token stopToken, std::size_t workerId);
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};
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//
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// public functions
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//
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namespace impl
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{
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extern thread_local TaskLoop::StoredTask* gCurrentTask;
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inline void throwIfCancelled()
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{
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if (gCurrentTask->sharedState->cancelled_)
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{
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throw TaskCancelled();
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}
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}
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}
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template<typename TResult>
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TaskBase<TResult>::~TaskBase() noexcept
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{
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if (handle_)
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{
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handle_.destroy();
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}
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}
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template<typename TResult>
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inline FuturePtr<TResult> TaskLoop::addTask(TaskBase<TResult> task, TaskHandle* outHandle) noexcept
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{
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MIJIN_ASSERT(!task.getLoop(), "Attempting to add task that already has a loop!");
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task.setLoop(this);
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auto sharedState = std::make_shared<TaskSharedState>();
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auto future = std::make_shared<Future<TResult>>();
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auto setFuture = &setFutureHelper<TResult>;
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|
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if (outHandle != nullptr)
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|
{
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*outHandle = TaskHandle(sharedState);
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}
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|
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|
// add tasks to a seperate vector first as we might be running another task right now
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addStoredTask(StoredTask{
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.sharedState = std::move(sharedState),
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.task = wrapTask(std::move(task)),
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.setFuture = setFuture,
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.resultData = future
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});
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|
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return future;
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|
}
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|
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inline TaskStatus TaskLoop::tickTask(StoredTask& task) noexcept
|
|
{
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|
TaskStatus status = {};
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impl::gCurrentTask = &task;
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do
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|
{
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task.task->resume();
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status = task.task ? task.task->status() : TaskStatus::WAITING; // no inner task -> task switch context (and will be removed later)
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|
}
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|
while (status == TaskStatus::RUNNING);
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|
impl::gCurrentTask = nullptr;
|
|
|
|
if (task.task && task.task->exception())
|
|
{
|
|
// TODO: handle the exception somehow, others may be waiting
|
|
return TaskStatus::FINISHED;
|
|
}
|
|
if (status == TaskStatus::YIELDED || status == TaskStatus::FINISHED)
|
|
{
|
|
task.setFuture(task);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/* static */ inline auto TaskLoop::current() noexcept -> TaskLoop&
|
|
{
|
|
MIJIN_ASSERT(currentLoopStorage() != nullptr, "Attempting to fetch current loop while no coroutine is running!");
|
|
return *currentLoopStorage();
|
|
}
|
|
|
|
/* static */ auto TaskLoop::currentLoopStorage() noexcept -> TaskLoop*&
|
|
{
|
|
static thread_local TaskLoop* storage = nullptr;
|
|
return storage;
|
|
}
|
|
|
|
template<typename TResult>
|
|
/* static */ inline void TaskLoop::setFutureHelper(StoredTask& storedTask) noexcept
|
|
{
|
|
TaskBase<TResult>& task = *static_cast<TaskBase<TResult>*>(storedTask.task->raw());
|
|
auto future = std::any_cast<FuturePtr<TResult>>(storedTask.resultData);
|
|
|
|
if constexpr (!std::is_same_v<TResult, void>)
|
|
{
|
|
MIJIN_ASSERT(!task.state().value.empty(), "Task did not produce a value?");
|
|
future->set(std::move(task.state().value.get()));
|
|
}
|
|
else {
|
|
future->set();
|
|
}
|
|
}
|
|
|
|
inline std::suspend_always switchContext(TaskLoop& taskLoop)
|
|
{
|
|
TaskLoop& currentTaskLoop = TaskLoop::current();
|
|
if (¤tTaskLoop == &taskLoop) {
|
|
return {};
|
|
}
|
|
currentTaskLoop.transferCurrentTask(taskLoop);
|
|
return {};
|
|
}
|
|
|
|
inline auto SimpleTaskLoop::tick() noexcept -> CanContinue
|
|
{
|
|
// set current taskloop
|
|
MIJIN_ASSERT(currentLoopStorage() == nullptr, "Trying to tick a loop from a coroutine, this is not supported.");
|
|
currentLoopStorage() = this;
|
|
threadId_ = std::this_thread::get_id();
|
|
|
|
// move over all tasks from newTasks
|
|
for (StoredTask& task : newTasks_)
|
|
{
|
|
tasks_.push_back(std::move(task));
|
|
}
|
|
newTasks_.clear();
|
|
|
|
// also pick up tasks from other threads
|
|
while(true)
|
|
{
|
|
std::optional<StoredTask> task = queuedTasks_.tryPop();
|
|
if (!task.has_value()) {
|
|
break;
|
|
}
|
|
tasks_.push_back(std::move(*task));
|
|
}
|
|
|
|
// remove any tasks that are finished executing
|
|
auto it = std::remove_if(tasks_.begin(), tasks_.end(), [](StoredTask& task) {
|
|
return task.task->status() == TaskStatus::FINISHED;
|
|
});
|
|
tasks_.erase(it, tasks_.end());
|
|
|
|
CanContinue canContinue = CanContinue::NO;
|
|
// then execute all tasks that can be executed
|
|
for (currentTask_ = tasks_.begin(); currentTask_ != tasks_.end(); ++currentTask_)
|
|
{
|
|
StoredTask& task = *currentTask_;
|
|
TaskStatus status = task.task->status();
|
|
if (status != TaskStatus::SUSPENDED && status != TaskStatus::YIELDED)
|
|
{
|
|
MIJIN_ASSERT(status == TaskStatus::WAITING, "Task with invalid status in task list!");
|
|
continue;
|
|
}
|
|
|
|
status = tickTask(task);
|
|
|
|
if (status == TaskStatus::SUSPENDED || status == TaskStatus::YIELDED)
|
|
{
|
|
canContinue = CanContinue::YES;
|
|
}
|
|
}
|
|
// reset current loop
|
|
currentLoopStorage() = nullptr;
|
|
|
|
// remove any tasks that have been transferred to another queue
|
|
it = std::remove_if(tasks_.begin(), tasks_.end(), [](const StoredTask& task) {
|
|
return task.task == nullptr;
|
|
});
|
|
tasks_.erase(it, tasks_.end());
|
|
|
|
return canContinue;
|
|
}
|
|
|
|
inline void SimpleTaskLoop::runUntilDone(IgnoreWaiting ignoreWaiting) noexcept
|
|
{
|
|
while (!tasks_.empty() || !newTasks_.empty())
|
|
{
|
|
const CanContinue canContinue = tick();
|
|
if (ignoreWaiting && !canContinue)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// utility stuff
|
|
|
|
inline TaskAwaitableSuspend c_suspend() {
|
|
return TaskAwaitableSuspend();
|
|
}
|
|
|
|
template<template<typename...> typename TCollection, typename TType, typename... TTemplateArgs>
|
|
Task<> c_allDone(const TCollection<FuturePtr<TType>, TTemplateArgs...>& futures)
|
|
{
|
|
bool allDone = true;
|
|
do
|
|
{
|
|
allDone = true;
|
|
for (const FuturePtr<TType>& future : futures)
|
|
{
|
|
if (future && !future->ready()) {
|
|
allDone = false;
|
|
break;
|
|
}
|
|
}
|
|
co_await c_suspend();
|
|
} while (!allDone);
|
|
}
|
|
|
|
#if MIJIN_COROUTINE_ENABLE_DEBUG_INFO
|
|
#endif
|
|
}
|
|
|
|
#endif // MIJIN_ASYNC_COROUTINE_HPP_INCLUDED
|