Martin Michelsen
39 lines
999 B
C++
39 lines
999 B
C++
#pragma once
|
|
|
|
#include <event2/event.h>
|
|
|
|
#include <condition_variable>
|
|
#include <functional>
|
|
#include <memory>
|
|
#include <mutex>
|
|
#include <optional>
|
|
#include <stdexcept>
|
|
|
|
void forward_to_event_thread(std::shared_ptr<struct event_base> base, std::function<void()>&& fn);
|
|
|
|
template <typename T>
|
|
T call_on_event_thread(std::shared_ptr<struct event_base> base, std::function<T()>&& compute) {
|
|
std::optional<T> ret;
|
|
std::string exc_what;
|
|
std::mutex ret_lock;
|
|
std::condition_variable ret_cv;
|
|
std::unique_lock<std::mutex> g(ret_lock);
|
|
forward_to_event_thread(base, [&]() -> void {
|
|
std::lock_guard<std::mutex> g(ret_lock);
|
|
try {
|
|
ret = compute();
|
|
} catch (const std::exception& e) {
|
|
exc_what = e.what();
|
|
}
|
|
ret_cv.notify_one();
|
|
});
|
|
ret_cv.wait(g);
|
|
if (!ret.has_value()) {
|
|
throw std::runtime_error(exc_what);
|
|
}
|
|
return ret.value();
|
|
}
|
|
|
|
template <>
|
|
void call_on_event_thread<void>(std::shared_ptr<struct event_base> base, std::function<void()>&& compute);
|