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#include "cru/base/platform/unix/EventLoop.h"
#include <poll.h>
#include <algorithm>
#include <chrono>
#include <functional>
#include <thread>
namespace cru::platform::unix {
int UnixTimerFile::GetReadFd() const { return this->read_fd_; }
UnixEventLoop::UnixEventLoop() : polls_(1), poll_actions_(1) {
auto action_pipe = OpenUniDirectionalPipe(UnixPipeFlags::NonBlock);
action_pipe_read_end_ = std::move(action_pipe.read);
action_pipe_write_end_ = std::move(action_pipe.write);
polls_[0].fd = action_pipe_read_end_;
polls_[0].events = POLLIN;
poll_actions_[0] = [](auto _) {};
}
void UnixEventLoop::QueueAction(std::function<void()> action) {
if (std::this_thread::get_id() == running_thread_) {
action();
} else {
auto pointer = new std::function<void()>(std::move(action));
action_pipe_write_end_.Write(&pointer, sizeof(decltype(pointer)));
}
}
int UnixEventLoop::Run() {
running_thread_ = std::this_thread::get_id();
while (!exit_code_) {
int poll_timeout = -1;
if (CheckPoll()) {
continue;
}
auto now = std::chrono::steady_clock::now();
if (auto result = timer_registry_.Update(now)) {
result->data();
continue;
}
if (CheckActionPipe()) {
continue;
}
if (auto next_timeout = timer_registry_.NextTimeout(now)) {
poll_timeout = next_timeout->count();
}
auto result = ::poll(polls_.data(), polls_.size(), poll_timeout);
if (result < 0) {
throw Exception("Failed to poll in event loop.");
}
}
return exit_code_.value();
}
void UnixEventLoop::RequestQuit(int exit_code) {
QueueAction([this, exit_code] { exit_code_ = exit_code; });
}
int UnixEventLoop::SetTimer(std::function<void()> action,
std::chrono::milliseconds timeout, bool repeat) {
return timer_registry_.Add(std::move(action), timeout, repeat);
}
void UnixEventLoop::CancelTimer(int id) { timer_registry_.Remove(id); }
bool UnixEventLoop::CheckPoll() {
auto iter = std::ranges::find_if(
polls_, [](const pollfd& poll_fd) { return poll_fd.revents != 0; });
if (iter == polls_.cend()) {
return false;
}
auto& revents = iter->revents;
if (revents != 0) {
poll_actions_[iter - polls_.cbegin()](revents);
}
revents = 0;
return true;
}
bool UnixEventLoop::CheckActionPipe() {
std::function<void()>* pointer;
constexpr size_t pointer_size = sizeof(decltype(pointer));
auto rest = pointer_size;
while (rest > 0) {
auto result = action_pipe_read_end_.Read(&pointer, rest);
if (result == -1) { // If no data.
if (rest == pointer_size) {
return false;
} else {
continue; // Try read again (might spin), as we are in the middle of
// reading a pointer.
}
}
if (result == 0) {
throw Exception("Unexpected EOF of the timer pipe.");
}
rest -= result;
}
(*pointer)();
delete pointer;
return true;
}
void UnixEventLoop::SetPoll(int fd, PollEvents events, PollHandler action) {
for (auto& poll_fd : polls_) {
if (poll_fd.fd == fd) {
poll_fd.events = events;
return;
}
}
pollfd poll_fd;
poll_fd.fd = fd;
poll_fd.events = events;
poll_fd.revents = 0;
polls_.push_back(poll_fd);
poll_actions_.push_back(std::move(action));
}
void UnixEventLoop::RemovePoll(int fd) {
auto iter = std::ranges::find_if(
polls_, [fd](const pollfd& poll_fd) { return poll_fd.fd == fd; });
if (iter != polls_.cend()) {
auto index = iter - polls_.cbegin();
polls_.erase(iter);
poll_actions_.erase(poll_actions_.cbegin() + index);
}
}
} // namespace cru::platform::unix
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