mirror of
https://github.com/RGBCube/serenity
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69c1910037
The event loop system was previously very singletony to the point that
there's only a single event loop stack per process and only one event
loop (the topmost) can run at a time. This commit simply makes the event
loop stack and related structures thread-local so that each thread has
an isolated event loop system.
Some things are kept at a global level and synchronized with the new
MutexProtected: The main event loop needs to still be obtainable from
anywhere, as it closes down the application when it exits. The ID
allocator is global as IDs should not be shared even between threads.
And for the inspector server connection, the same as for the main loop
holds.
Note that currently, the wake pipe is only created by the main thread,
so notifications don't work on other threads.
This removes the temporary mutex fix for notifiers, introduced in
0631d3fed5 .
136 lines
3.5 KiB
C++
136 lines
3.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, kleines Filmröllchen <malu.bertsch@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Forward.h>
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#include <AK/Function.h>
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#include <AK/HashMap.h>
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#include <AK/Noncopyable.h>
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#include <AK/NonnullOwnPtr.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/Time.h>
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#include <AK/Vector.h>
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#include <AK/WeakPtr.h>
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#include <LibCore/DeferredInvocationContext.h>
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#include <LibCore/Event.h>
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#include <LibCore/Forward.h>
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#include <LibThreading/MutexProtected.h>
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#include <sys/time.h>
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#include <sys/types.h>
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namespace Core {
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static Threading::MutexProtected<EventLoop*> s_main_event_loop;
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class EventLoop {
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public:
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enum class MakeInspectable {
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No,
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Yes,
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};
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explicit EventLoop(MakeInspectable = MakeInspectable::No);
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~EventLoop();
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int exec();
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enum class WaitMode {
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WaitForEvents,
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PollForEvents,
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};
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// processe events, generally called by exec() in a loop.
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// this should really only be used for integrating with other event loops
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size_t pump(WaitMode = WaitMode::WaitForEvents);
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void spin_until(Function<bool()>);
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void post_event(Object& receiver, NonnullOwnPtr<Event>&&);
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template<typename Callback>
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static decltype(auto) with_main_locked(Callback callback)
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{
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return s_main_event_loop.with_locked([&callback](auto*& event_loop) {
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VERIFY(event_loop != nullptr);
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return callback(event_loop);
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});
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}
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static EventLoop& current();
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bool was_exit_requested() const { return m_exit_requested; }
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static int register_timer(Object&, int milliseconds, bool should_reload, TimerShouldFireWhenNotVisible);
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static bool unregister_timer(int timer_id);
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static void register_notifier(Badge<Notifier>, Notifier&);
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static void unregister_notifier(Badge<Notifier>, Notifier&);
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void quit(int);
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void unquit();
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void take_pending_events_from(EventLoop& other)
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{
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m_queued_events.extend(move(other.m_queued_events));
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}
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static void wake();
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static int register_signal(int signo, Function<void(int)> handler);
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static void unregister_signal(int handler_id);
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// Note: Boost uses Parent/Child/Prepare, but we don't really have anything
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// interesting to do in the parent or before forking.
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enum class ForkEvent {
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Child,
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};
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static void notify_forked(ForkEvent);
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static bool has_been_instantiated();
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void deferred_invoke(Function<void()> invokee)
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{
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auto context = DeferredInvocationContext::construct();
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post_event(context, make<Core::DeferredInvocationEvent>(context, move(invokee)));
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}
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private:
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void wait_for_event(WaitMode);
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Optional<Time> get_next_timer_expiration();
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static void dispatch_signal(int);
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static void handle_signal(int);
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struct QueuedEvent {
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AK_MAKE_NONCOPYABLE(QueuedEvent);
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public:
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QueuedEvent(Object& receiver, NonnullOwnPtr<Event>);
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QueuedEvent(QueuedEvent&&);
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~QueuedEvent();
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WeakPtr<Object> receiver;
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NonnullOwnPtr<Event> event;
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};
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Vector<QueuedEvent, 64> m_queued_events;
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static pid_t s_pid;
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bool m_exit_requested { false };
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int m_exit_code { 0 };
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static thread_local int s_wake_pipe_fds[2];
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struct Private;
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NonnullOwnPtr<Private> m_private;
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};
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inline void deferred_invoke(Function<void()> invokee)
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{
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EventLoop::current().deferred_invoke(move(invokee));
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}
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}
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