tdlight/tdactor/td/actor/impl/Scheduler.h

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//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/actor/impl/ActorInfo-decl.h"
#include "td/actor/impl/Scheduler-decl.h"
#include "td/utils/common.h"
#include "td/utils/Heap.h"
#include "td/utils/logging.h"
#include "td/utils/ObjectPool.h"
#include "td/utils/port/detail/PollableFd.h"
#include "td/utils/port/PollFlags.h"
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#include "td/utils/Promise.h"
#include "td/utils/Slice.h"
#include "td/utils/Time.h"
#include <atomic>
#include <tuple>
#include <utility>
namespace td {
/*** EventGuard ***/
class EventGuard {
public:
EventGuard(Scheduler *scheduler, ActorInfo *actor_info);
bool can_run() const {
return event_context_.flags == 0;
}
EventGuard(const EventGuard &other) = delete;
EventGuard &operator=(const EventGuard &other) = delete;
EventGuard(EventGuard &&other) = delete;
EventGuard &operator=(EventGuard &&other) = delete;
~EventGuard();
private:
Scheduler::EventContext event_context_;
Scheduler::EventContext *event_context_ptr_;
Scheduler *scheduler_;
ActorContext *save_context_;
const char *save_log_tag2_;
void swap_context(ActorInfo *info);
};
/*** Scheduler ***/
inline SchedulerGuard Scheduler::get_guard() {
return SchedulerGuard(this);
}
inline SchedulerGuard Scheduler::get_const_guard() {
return SchedulerGuard(this, false);
}
inline void Scheduler::init() {
init(0, {}, nullptr);
}
inline int32 Scheduler::sched_id() const {
return sched_id_;
}
inline int32 Scheduler::sched_count() const {
return sched_n_;
}
template <class ActorT, class... Args>
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ActorOwn<ActorT> Scheduler::create_actor(Slice name, Args &&...args) {
return register_actor_impl(name, new ActorT(std::forward<Args>(args)...), Actor::Deleter::Destroy, sched_id_);
}
template <class ActorT, class... Args>
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ActorOwn<ActorT> Scheduler::create_actor_on_scheduler(Slice name, int32 sched_id, Args &&...args) {
return register_actor_impl(name, new ActorT(std::forward<Args>(args)...), Actor::Deleter::Destroy, sched_id);
}
template <class ActorT>
ActorOwn<ActorT> Scheduler::register_actor(Slice name, ActorT *actor_ptr, int32 sched_id) {
return register_actor_impl(name, actor_ptr, Actor::Deleter::None, sched_id);
}
template <class ActorT>
ActorOwn<ActorT> Scheduler::register_actor(Slice name, unique_ptr<ActorT> actor_ptr, int32 sched_id) {
return register_actor_impl(name, actor_ptr.release(), Actor::Deleter::Destroy, sched_id);
}
template <class ActorT>
ActorOwn<ActorT> Scheduler::register_actor_impl(Slice name, ActorT *actor_ptr, Actor::Deleter deleter, int32 sched_id) {
CHECK(has_guard_);
if (sched_id == -1) {
sched_id = sched_id_;
}
#if TD_THREAD_UNSUPPORTED || TD_EVENTFD_UNSUPPORTED
sched_id = 0;
#endif
LOG_CHECK(sched_id == sched_id_ || (0 <= sched_id && sched_id < static_cast<int32>(outbound_queues_.size())))
<< sched_id;
auto info = actor_info_pool_->create_empty();
actor_count_++;
auto weak_info = info.get_weak();
auto actor_info = info.get();
actor_info->init(sched_id_, name, std::move(info), static_cast<Actor *>(actor_ptr), deleter,
ActorTraits<ActorT>::need_context, ActorTraits<ActorT>::need_start_up);
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VLOG(actor) << "Create actor " << *actor_info << " (actor_count = " << actor_count_ << ')';
ActorId<ActorT> actor_id = weak_info->actor_id(actor_ptr);
if (sched_id != sched_id_) {
send<ActorSendType::LaterWeak>(actor_id, Event::start());
do_migrate_actor(actor_info, sched_id);
} else {
pending_actors_list_.put(weak_info->get_list_node());
if (ActorTraits<ActorT>::need_start_up) {
send<ActorSendType::LaterWeak>(actor_id, Event::start());
}
}
return ActorOwn<ActorT>(actor_id);
}
template <class ActorT>
ActorOwn<ActorT> Scheduler::register_existing_actor(unique_ptr<ActorT> actor_ptr) {
CHECK(!actor_ptr->empty());
auto actor_info = actor_ptr->get_info();
CHECK(actor_info->migrate_dest_flag_atomic().first == sched_id_);
return actor_info->transfer_ownership_to_scheduler(std::move(actor_ptr));
}
inline void Scheduler::destroy_actor(ActorInfo *actor_info) {
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VLOG(actor) << "Destroy actor " << *actor_info << " (actor_count = " << actor_count_ << ')';
LOG_CHECK(actor_info->migrate_dest() == sched_id_) << actor_info->migrate_dest() << " " << sched_id_;
cancel_actor_timeout(actor_info);
actor_info->get_list_node()->remove();
// called by ObjectPool
// actor_info->clear();
actor_count_--;
CHECK(actor_count_ >= 0);
}
template <class RunFuncT, class EventFuncT>
void Scheduler::flush_mailbox(ActorInfo *actor_info, const RunFuncT &run_func, const EventFuncT &event_func) {
auto &mailbox = actor_info->mailbox_;
size_t mailbox_size = mailbox.size();
CHECK(mailbox_size != 0);
EventGuard guard(this, actor_info);
size_t i = 0;
for (; i < mailbox_size && guard.can_run(); i++) {
do_event(actor_info, std::move(mailbox[i]));
}
if (run_func) {
if (guard.can_run()) {
(*run_func)(actor_info);
} else {
mailbox.insert(mailbox.begin() + i, (*event_func)());
}
}
mailbox.erase(mailbox.begin(), mailbox.begin() + i);
}
inline void Scheduler::send_to_scheduler(int32 sched_id, const ActorId<Actor> &actor_id, Event &&event) {
if (sched_id == sched_id_) {
ActorInfo *actor_info = actor_id.get_actor_info();
pending_events_[actor_info].push_back(std::move(event));
} else {
send_to_other_scheduler(sched_id, actor_id, std::move(event));
}
}
template <class T>
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void Scheduler::destroy_on_scheduler(int32 sched_id, T &value) {
if (!value.empty()) {
destroy_on_scheduler_impl(sched_id, PromiseCreator::lambda([value = std::move(value)](Unit) {
// destroy value
}));
}
}
template <class... ArgsT>
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void Scheduler::destroy_on_scheduler(int32 sched_id, ArgsT &...values) {
destroy_on_scheduler_impl(sched_id, PromiseCreator::lambda([values = std::make_tuple(std::move(values)...)](Unit) {
// destroy values
}));
}
inline void Scheduler::before_tail_send(const ActorId<> &actor_id) {
// TODO
}
inline void Scheduler::inc_wait_generation() {
wait_generation_ += 2;
}
template <ActorSendType send_type, class RunFuncT, class EventFuncT>
void Scheduler::send_impl(const ActorId<> &actor_id, const RunFuncT &run_func, const EventFuncT &event_func) {
ActorInfo *actor_info = actor_id.get_actor_info();
if (unlikely(actor_info == nullptr || close_flag_)) {
return;
}
CHECK(actor_info != nullptr);
int32 actor_sched_id;
bool is_migrating;
std::tie(actor_sched_id, is_migrating) = actor_info->migrate_dest_flag_atomic();
bool on_current_sched = !is_migrating && sched_id_ == actor_sched_id;
CHECK(has_guard_ || !on_current_sched);
if (likely(send_type == ActorSendType::Immediate && on_current_sched && !actor_info->is_running() &&
!actor_info->must_wait(wait_generation_))) { // run immediately
if (likely(actor_info->mailbox_.empty())) {
EventGuard guard(this, actor_info);
run_func(actor_info);
} else {
flush_mailbox(actor_info, &run_func, &event_func);
}
} else {
if (on_current_sched) {
add_to_mailbox(actor_info, event_func());
if (send_type == ActorSendType::Later) {
actor_info->set_wait_generation(wait_generation_);
}
} else {
send_to_scheduler(actor_sched_id, actor_id, event_func());
}
}
}
template <ActorSendType send_type, class EventT>
void Scheduler::send_lambda(ActorRef actor_ref, EventT &&lambda) {
return send_impl<send_type>(
actor_ref.get(),
[&](ActorInfo *actor_info) {
event_context_ptr_->link_token = actor_ref.token();
lambda();
},
[&] {
auto event = Event::lambda(std::forward<EventT>(lambda));
event.set_link_token(actor_ref.token());
return event;
});
}
template <ActorSendType send_type, class EventT>
void Scheduler::send_closure(ActorRef actor_ref, EventT &&closure) {
return send_impl<send_type>(
actor_ref.get(),
[&](ActorInfo *actor_info) {
event_context_ptr_->link_token = actor_ref.token();
closure.run(static_cast<typename EventT::ActorType *>(actor_info->get_actor_unsafe()));
},
[&] {
auto event = Event::immediate_closure(std::forward<EventT>(closure));
event.set_link_token(actor_ref.token());
return event;
});
}
template <ActorSendType send_type>
void Scheduler::send(ActorRef actor_ref, Event &&event) {
event.set_link_token(actor_ref.token());
return send_impl<send_type>(
actor_ref.get(), [&](ActorInfo *actor_info) { do_event(actor_info, std::move(event)); },
[&] { return std::move(event); });
}
inline void Scheduler::subscribe(PollableFd fd, PollFlags flags) {
instance()->poll_.subscribe(std::move(fd), flags);
}
inline void Scheduler::unsubscribe(PollableFdRef fd) {
instance()->poll_.unsubscribe(std::move(fd));
}
inline void Scheduler::unsubscribe_before_close(PollableFdRef fd) {
instance()->poll_.unsubscribe_before_close(std::move(fd));
}
inline void Scheduler::yield_actor(Actor *actor) {
yield_actor(actor->get_info());
}
inline void Scheduler::yield_actor(ActorInfo *actor_info) {
send<ActorSendType::LaterWeak>(actor_info->actor_id(), Event::yield());
}
inline void Scheduler::stop_actor(Actor *actor) {
stop_actor(actor->get_info());
}
inline void Scheduler::stop_actor(ActorInfo *actor_info) {
CHECK(event_context_ptr_->actor_info == actor_info);
event_context_ptr_->flags |= EventContext::Stop;
}
inline uint64 Scheduler::get_link_token(Actor *actor) {
return get_link_token(actor->get_info());
}
inline uint64 Scheduler::get_link_token(ActorInfo *actor_info) {
LOG_CHECK(event_context_ptr_->actor_info == actor_info) << actor_info->get_name();
return event_context_ptr_->link_token;
}
inline void Scheduler::finish_migrate_actor(Actor *actor) {
register_migrated_actor(actor->get_info());
}
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inline double Scheduler::get_actor_timeout(const Actor *actor) const {
return get_actor_timeout(actor->get_info());
}
inline void Scheduler::set_actor_timeout_in(Actor *actor, double timeout) {
set_actor_timeout_in(actor->get_info(), timeout);
}
inline void Scheduler::set_actor_timeout_at(Actor *actor, double timeout_at) {
set_actor_timeout_at(actor->get_info(), timeout_at);
}
inline void Scheduler::cancel_actor_timeout(Actor *actor) {
cancel_actor_timeout(actor->get_info());
}
inline void Scheduler::cancel_actor_timeout(ActorInfo *actor_info) {
HeapNode *heap_node = actor_info->get_heap_node();
if (heap_node->in_heap()) {
timeout_queue_.erase(heap_node);
}
}
inline void Scheduler::finish() {
if (callback_) {
callback_->on_finish();
}
yield();
}
inline void Scheduler::yield() {
yield_flag_ = true;
}
inline void Scheduler::wakeup() {
std::atomic_thread_fence(std::memory_order_release);
#if !TD_THREAD_UNSUPPORTED && !TD_EVENTFD_UNSUPPORTED
inbound_queue_->writer_put({});
#endif
}
inline void Scheduler::run(Timestamp timeout) {
auto guard = get_guard();
run_no_guard(timeout);
}
/*** Interface to current scheduler ***/
template <class ActorT, class... Args>
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ActorOwn<ActorT> create_actor(Slice name, Args &&...args) {
return Scheduler::instance()->create_actor<ActorT>(name, std::forward<Args>(args)...);
}
template <class ActorT, class... Args>
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ActorOwn<ActorT> create_actor_on_scheduler(Slice name, int32 sched_id, Args &&...args) {
return Scheduler::instance()->create_actor_on_scheduler<ActorT>(name, sched_id, std::forward<Args>(args)...);
}
template <class ActorT>
ActorOwn<ActorT> register_actor(Slice name, ActorT *actor_ptr, int32 sched_id) {
return Scheduler::instance()->register_actor<ActorT>(name, actor_ptr, sched_id);
}
template <class ActorT>
ActorOwn<ActorT> register_actor(Slice name, unique_ptr<ActorT> actor_ptr, int32 sched_id) {
return Scheduler::instance()->register_actor<ActorT>(name, std::move(actor_ptr), sched_id);
}
template <class ActorT>
ActorOwn<ActorT> register_existing_actor(unique_ptr<ActorT> actor_ptr) {
return Scheduler::instance()->register_existing_actor(std::move(actor_ptr));
}
} // namespace td