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task.h
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task.h
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#pragma once
#include "utils.h"
#include "worker.h"
#include <concepts>
#include <coroutine>
#include <exception>
#include <future>
#include <iostream>
#include <memory>
namespace RCo {
class RWorker;
template <typename Result, template <typename> class OP_T> class RPromise;
template <template <typename> class OP_T, typename Result>
concept OP_Type =
requires(std::coroutine_handle<RPromise<Result, OP_T>> h, RWorker *worker) {
OP_T<Result>::await_suspend(h, worker);
};
template <typename Result> class RAlwaysJoinOP {
public:
template <template <typename> class IN_OP_T>
static void await_suspend(std::coroutine_handle<RPromise<Result, IN_OP_T>> h,
RWorker *worker, void *metadata) {
std::cout << "Always got..." << std::endl;
worker->appendWork(new dumyWorkBase([h = h]() { h.resume(); }));
}
};
template <typename Result, template <typename> class OP_T = RAlwaysJoinOP>
class RTask {
public:
using ResultType = Result;
template <typename OP_IN_T> using OPType = OP_T<OP_IN_T>;
using promise_type = RPromise<Result, OP_T>;
RTask(const RTask &task) {
this->worker = task.worker;
this->handler = task.handler;
this->promise = task.promise;
}
bool await_ready() { return false; }
void await_resume() {}
RTask(std::coroutine_handle<RTask<Result, OP_T>::promise_type> handler,
RWorker *worker, std::shared_ptr<std::promise<Result>> promise)
: handler(handler), worker(worker), promise(promise) {}
template <typename IN_T, template <typename> class IN_OP_T>
void await_suspend(std::coroutine_handle<RPromise<IN_T, IN_OP_T>> h) {
std::cout << "Suspend.." << std::endl;
OP_T<IN_T>::await_suspend(h, this->worker, metadata);
}
RWorker *worker;
std::shared_ptr<std::promise<Result>> promise;
std::coroutine_handle<promise_type> handler;
void *metadata = nullptr;
};
template <typename Result, template <typename> class OP_T>
class __RPromise_Base {
public:
std::shared_ptr<std::promise<Result>> promise =
std::make_shared<std::promise<Result>>();
RTask<Result, OP_T> task;
public:
__RPromise_Base(
std::coroutine_handle<typename RTask<Result, OP_T>::promise_type> handler,
RWorker *worker)
: task(handler, worker, promise) {}
RTask<Result, OP_T> get_return_object() { return this->task; }
std::suspend_always initial_suspend() {
std::cout << "Init..." << std::endl;
// so that we can have the worker to run other coroutine
return {};
} // waiting for the scheduler to resume it
template <typename T>
requires std::convertible_to<T, Result>
std::suspend_always yield_value(T &&value) {
// value_ = std::forward<T>(value); // caching the result in promise
return {};
}
std::suspend_never final_suspend() noexcept { return {}; }
void unhandled_exception() noexcept {
auto exception = std::current_exception();
// stop the panic here to avoid the crash of whole program
// TODO: pass the crash to logger or user's custom handler
}
};
template <typename Result, template <typename> class OP_T>
class RPromise : public __RPromise_Base<Result, OP_T> {
public:
RPromise()
: __RPromise_Base<Result, OP_T>(
std::coroutine_handle<RPromise<Result, OP_T>>::from_promise(*this),
current_worker) {}
template <typename T, typename U = Result>
requires std::convertible_to<T, Result>
void return_value(T &&value) noexcept {
this->promise->set_value(value);
}
// template <typename U = Result>
// typename std::enable_if<std::is_void<U>::value>::type
// return_void() noexcept {
// promise->set_value();
// }
};
template <template <typename> class OP_T>
class RPromise<void, OP_T> : public __RPromise_Base<void, OP_T> {
public:
RPromise()
: __RPromise_Base<void, OP_T>(
std::coroutine_handle<RPromise<void, OP_T>>::from_promise(*this),
current_worker) {}
void return_void() noexcept { this->promise->set_value(); }
};
} // namespace RCo