LibCore: Port EventLoop to Windows

Author: https://github.com/stasoid
Commit: https://github.com/LadybirdBrowser/ladybird/commit/1c771359486
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2299
Reviewed-by: https://github.com/ADKaster ✅

Libraries/LibCore/EventLoopImplementationWindows.h

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2023, Andreas Kling <andreas@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/NonnullOwnPtr.h>
+#include <LibCore/EventLoopImplementation.h>
+
+namespace Core {
+
+class EventLoopManagerWindows final : public EventLoopManager {
+public:
+    virtual ~EventLoopManagerWindows() override = default;
+
+    virtual NonnullOwnPtr<EventLoopImplementation> make_implementation() override;
+
+    virtual intptr_t register_timer(EventReceiver&, int milliseconds, bool should_reload, TimerShouldFireWhenNotVisible) override;
+    virtual void unregister_timer(intptr_t timer_id) override;
+
+    virtual void register_notifier(Notifier&) override;
+    virtual void unregister_notifier(Notifier&) override;
+
+    virtual void did_post_event() override;
+
+    virtual int register_signal(int signal_number, Function<void(int)> handler) override;
+    virtual void unregister_signal(int handler_id) override;
+};
+
+class EventLoopImplementationWindows final : public EventLoopImplementation {
+public:
+    static NonnullOwnPtr<EventLoopImplementationWindows> create() { return make<EventLoopImplementationWindows>(); }
+
+    EventLoopImplementationWindows();
+    virtual ~EventLoopImplementationWindows() override = default;
+
+    virtual int exec() override;
+    virtual size_t pump(PumpMode) override;
+    virtual void quit(int) override;
+
+    virtual void wake() override;
+
+    virtual void unquit() override;
+    virtual bool was_exit_requested() const override;
+    virtual void notify_forked_and_in_child() override;
+    virtual void post_event(EventReceiver& receiver, NonnullOwnPtr<Event>&&) override;
+
+private:
+    bool m_exit_requested { false };
+    int m_exit_code { 0 };
+
+    // The wake event handle of this event loop needs to be accessible from other threads.
+    void*& m_wake_event;
+};
+
+using EventLoopManagerPlatform = EventLoopManagerWindows;
+
+}