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https://github.com/rad4day/Waybar.git
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285a264aae
Implement a wrapper over Glib::Dispatcher that passes the arguments to the signal consumer via synchronized `std::queue`. Arguments are always passed by value and the return type of the signal is expected to be `void`.
60 lines
1.4 KiB
C++
60 lines
1.4 KiB
C++
#pragma once
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#include <glibmm/dispatcher.h>
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#include <sigc++/signal.h>
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#include <functional>
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#include <mutex>
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#include <queue>
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#include <tuple>
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#include <type_traits>
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namespace waybar {
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/**
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* Thread-safe signal wrapper.
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* Uses Glib::Dispatcher to pass events to another thread and locked queue to pass the arguments.
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*/
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template <typename... Args>
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struct SafeSignal : sigc::signal<void(std::decay_t<Args>...)> {
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public:
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SafeSignal() { dp_.connect(sigc::mem_fun(*this, &SafeSignal::handle_event)); }
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template <typename... EmitArgs>
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void emit(EmitArgs&&... args) {
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{
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std::unique_lock lock(mutex_);
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queue_.emplace(std::forward<EmitArgs>(args)...);
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}
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dp_.emit();
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}
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template <typename... EmitArgs>
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inline void operator()(EmitArgs&&... args) {
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emit(std::forward<EmitArgs>(args)...);
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}
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protected:
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using signal_t = sigc::signal<void(std::decay_t<Args>...)>;
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using arg_tuple_t = std::tuple<std::decay_t<Args>...>;
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// ensure that unwrapped methods are not accessible
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using signal_t::emit_reverse;
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using signal_t::make_slot;
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void handle_event() {
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auto fn = signal_t::make_slot();
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for (std::unique_lock lock(mutex_); !queue_.empty(); lock.lock()) {
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auto args = queue_.front();
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queue_.pop();
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lock.unlock();
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std::apply(fn, args);
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}
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}
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Glib::Dispatcher dp_;
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std::mutex mutex_;
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std::queue<arg_tuple_t> queue_;
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};
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} // namespace waybar
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