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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, kleines Filmröllchen <malu.bertsch@gmail.com>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Forward.h>
#include <AK/Function.h>
#include <AK/HashMap.h>
#include <AK/Noncopyable.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/NonnullRefPtr.h>
#include <AK/Time.h>
#include <AK/Vector.h>
#include <AK/WeakPtr.h>
#include <LibCore/DeferredInvocationContext.h>
#include <LibCore/Event.h>
#include <LibCore/Forward.h>
#include <LibThreading/MutexProtected.h>
#include <sys/time.h>
#include <sys/types.h>
namespace Core {
class EventLoop {
public:
enum class MakeInspectable {
No,
Yes,
};
enum class ShouldWake {
No,
Yes
};
explicit EventLoop(MakeInspectable = MakeInspectable::No);
~EventLoop();
static void initialize_wake_pipes();
int exec();
enum class WaitMode {
WaitForEvents,
PollForEvents,
};
// process events, generally called by exec() in a loop.
// this should really only be used for integrating with other event loops
size_t pump(WaitMode = WaitMode::WaitForEvents);
void spin_until(Function<bool()>);
void post_event(Object& receiver, NonnullOwnPtr<Event>&&, ShouldWake = ShouldWake::No);
static EventLoop& current();
bool was_exit_requested() const { return m_exit_requested; }
static int register_timer(Object&, int milliseconds, bool should_reload, TimerShouldFireWhenNotVisible);
static bool unregister_timer(int timer_id);
static void register_notifier(Badge<Notifier>, Notifier&);
static void unregister_notifier(Badge<Notifier>, Notifier&);
void quit(int);
void unquit();
void take_pending_events_from(EventLoop& other)
{
m_queued_events.extend(move(other.m_queued_events));
}
static void wake_current();
void wake();
static int register_signal(int signo, Function<void(int)> handler);
static void unregister_signal(int handler_id);
// Note: Boost uses Parent/Child/Prepare, but we don't really have anything
// interesting to do in the parent or before forking.
enum class ForkEvent {
Child,
};
static void notify_forked(ForkEvent);
static bool has_been_instantiated();
void deferred_invoke(Function<void()> invokee)
{
auto context = DeferredInvocationContext::construct();
post_event(context, make<Core::DeferredInvocationEvent>(context, move(invokee)));
}
private:
void wait_for_event(WaitMode);
Optional<Time> get_next_timer_expiration();
static void dispatch_signal(int);
static void handle_signal(int);
struct QueuedEvent {
AK_MAKE_NONCOPYABLE(QueuedEvent);
public:
QueuedEvent(Object& receiver, NonnullOwnPtr<Event>);
QueuedEvent(QueuedEvent&&);
~QueuedEvent() = default;
WeakPtr<Object> receiver;
NonnullOwnPtr<Event> event;
};
Vector<QueuedEvent, 64> m_queued_events;
static pid_t s_pid;
bool m_exit_requested { false };
int m_exit_code { 0 };
static thread_local int s_wake_pipe_fds[2];
static thread_local bool s_wake_pipe_initialized;
// The wake pipe of this event loop needs to be accessible from other threads.
int (*m_wake_pipe_fds)[2];
struct Private;
NonnullOwnPtr<Private> m_private;
};
inline void deferred_invoke(Function<void()> invokee)
{
EventLoop::current().deferred_invoke(move(invokee));
}
}
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