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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)
//
#include "td/actor/ConcurrentScheduler.h"
#include "td/utils/ExitGuard.h"
#include "td/utils/MpscPollableQueue.h"
#include "td/utils/port/thread_local.h"
#include "td/utils/ScopeGuard.h"
#include <memory>
namespace td {
ConcurrentScheduler::ConcurrentScheduler(int32 additional_thread_count, uint64 thread_affinity_mask) {
#if TD_THREAD_UNSUPPORTED || TD_EVENTFD_UNSUPPORTED
additional_thread_count = 0;
#endif
additional_thread_count++;
std::vector<std::shared_ptr<MpscPollableQueue<EventFull>>> outbound(additional_thread_count);
#if !TD_THREAD_UNSUPPORTED && !TD_EVENTFD_UNSUPPORTED
for (int32 i = 0; i < additional_thread_count; i++) {
auto queue = std::make_shared<MpscPollableQueue<EventFull>>();
queue->init();
outbound[i] = queue;
}
thread_affinity_mask_ = thread_affinity_mask;
#endif
// +1 for extra scheduler for IOCP and send_closure from unrelated threads
// It will know about other schedulers
// Other schedulers will have no idea about its existence
extra_scheduler_ = 1;
#if TD_THREAD_UNSUPPORTED || TD_EVENTFD_UNSUPPORTED
extra_scheduler_ = 0;
#endif
schedulers_.resize(additional_thread_count + extra_scheduler_);
for (int32 i = 0; i < additional_thread_count + extra_scheduler_; i++) {
auto &sched = schedulers_[i];
sched = make_unique<Scheduler>();
#if !TD_THREAD_UNSUPPORTED && !TD_EVENTFD_UNSUPPORTED
if (i >= additional_thread_count) {
auto queue = std::make_shared<MpscPollableQueue<EventFull>>();
queue->init();
outbound.push_back(std::move(queue));
}
#endif
sched->init(i, outbound, static_cast<Scheduler::Callback *>(this));
}
#if TD_PORT_WINDOWS
iocp_ = make_unique<detail::Iocp>();
iocp_->init();
#endif
state_ = State::Start;
}
void ConcurrentScheduler::test_one_thread_run() {
do {
for (auto &sched : schedulers_) {
sched->run(Timestamp::now_cached());
}
} while (!is_finished_.load(std::memory_order_relaxed));
}
void ConcurrentScheduler::start() {
CHECK(state_ == State::Start);
is_finished_.store(false, std::memory_order_relaxed);
#if !TD_THREAD_UNSUPPORTED && !TD_EVENTFD_UNSUPPORTED
for (size_t i = 1; i + extra_scheduler_ < schedulers_.size(); i++) {
auto &sched = schedulers_[i];
threads_.push_back(td::thread([&, thread_affinity_mask = thread_affinity_mask_] {
#if TD_PORT_WINDOWS
detail::Iocp::Guard iocp_guard(iocp_.get());
#endif
if (thread_affinity_mask != 0) {
thread::set_affinity_mask(this_thread::get_id(), thread_affinity_mask).ignore();
}
while (!is_finished()) {
sched->run(Timestamp::in(10));
}
}));
}
#if TD_PORT_WINDOWS
iocp_thread_ = td::thread([this] {
auto guard = this->get_send_guard();
this->iocp_->loop();
});
#endif
#endif
state_ = State::Run;
}
static TD_THREAD_LOCAL double emscripten_timeout;
bool ConcurrentScheduler::run_main(Timestamp timeout) {
CHECK(state_ == State::Run);
// run main scheduler in same thread
auto &main_sched = schedulers_[0];
if (!is_finished()) {
#if TD_PORT_WINDOWS
detail::Iocp::Guard iocp_guard(iocp_.get());
#endif
main_sched->run(timeout);
}
// hack for emscripten
emscripten_timeout = get_main_timeout().at();
return !is_finished();
}
Timestamp ConcurrentScheduler::get_main_timeout() {
CHECK(state_ == State::Run);
return schedulers_[0]->get_timeout();
}
double ConcurrentScheduler::emscripten_get_main_timeout() {
return Timestamp::at(emscripten_timeout).in();
}
void ConcurrentScheduler::emscripten_clear_main_timeout() {
emscripten_timeout = 0;
}
void ConcurrentScheduler::finish() {
CHECK(state_ == State::Run);
if (!is_finished()) {
on_finish();
}
#if TD_PORT_WINDOWS
SCOPE_EXIT {
iocp_->clear();
};
detail::Iocp::Guard iocp_guard(iocp_.get());
#endif
if (ExitGuard::is_exited()) {
#if !TD_THREAD_UNSUPPORTED && !TD_EVENTFD_UNSUPPORTED
// prevent closing of schedulers from already killed by OS threads
for (auto &thread : threads_) {
thread.detach();
}
#endif
#if TD_PORT_WINDOWS
iocp_->interrupt_loop();
iocp_thread_.detach();
#endif
return;
}
#if !TD_THREAD_UNSUPPORTED && !TD_EVENTFD_UNSUPPORTED
for (auto &thread : threads_) {
thread.join();
}
threads_.clear();
#endif
#if TD_PORT_WINDOWS
iocp_->interrupt_loop();
iocp_thread_.join();
#endif
schedulers_.clear();
for (auto &f : at_finish_) {
f();
}
at_finish_.clear();
state_ = State::Start;
}
void ConcurrentScheduler::on_finish() {
is_finished_.store(true, std::memory_order_relaxed);
for (auto &it : schedulers_) {
it->wakeup();
}
}
void ConcurrentScheduler::register_at_finish(std::function<void()> f) {
std::lock_guard<std::mutex> lock(at_finish_mutex_);
at_finish_.push_back(std::move(f));
}
} // namespace td
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