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LibCore: Big first step towards pluggable Core::EventLoop

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The EventLoop is now a wrapper around an EventLoopImplementation.
Our old EventLoop code has moved into EventLoopImplementationUnix and
continues to work as before.

The main difference is that all the separate thread_local variables have
been collected into a file-local ThreadData data structure.

The goal here is to allow running Core::EventLoop with a totally
different backend, such as Qt for Ladybird.
This commit is contained in:
Andreas Kling 2023-04-24 12:25:14 +02:00
parent 3de8dd921e
commit 16c47ccff6
11 changed files with 718 additions and 562 deletions
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51
Userland/Libraries/LibCore/EventLoopImplementationUnix.h Normal file
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/*
* Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibCore/EventLoopImplementation.h>
namespace Core {
class EventLoopImplementationUnix final : public EventLoopImplementation {
public:
EventLoopImplementationUnix();
virtual ~EventLoopImplementationUnix();
virtual int exec() override;
virtual size_t pump(PumpMode) override;
virtual void quit(int) override;
virtual void wake() override;
virtual void deferred_invoke(Function<void()>) override;
virtual int register_timer(Object&, int milliseconds, bool should_reload, TimerShouldFireWhenNotVisible) override;
virtual bool unregister_timer(int timer_id) override;
virtual void register_notifier(Notifier&) override;
virtual void unregister_notifier(Notifier&) override;
virtual void unquit() override;
virtual bool was_exit_requested() const override;
virtual void notify_forked_and_in_child() override;
virtual int register_signal(int signal_number, Function<void(int)> handler) override;
virtual void unregister_signal(int handler_id) override;
private:
void wait_for_events(PumpMode);
void dispatch_signal(int signal_number);
static void handle_signal(int signal_number);
static Optional<Time> get_next_timer_expiration();
bool m_exit_requested { false };
int m_exit_code { 0 };
// The wake pipe of this event loop needs to be accessible from other threads.
int (*m_wake_pipe_fds)[2];
};
}