ladybird/Libraries/LibCore/CEventLoop.h
Andreas Kling 94ca55cefd Meta: Add license header to source files
As suggested by Joshua, this commit adds the 2-clause BSD license as a
comment block to the top of every source file.

For the first pass, I've just added myself for simplicity. I encourage
everyone to add themselves as copyright holders of any file they've
added or modified in some significant way. If I've added myself in
error somewhere, feel free to replace it with the appropriate copyright
holder instead.

Going forward, all new source files should include a license header.
2020-01-18 09:45:54 +01:00

119 lines
3.6 KiB
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Badge.h>
#include <AK/HashMap.h>
#include <AK/OwnPtr.h>
#include <AK/Vector.h>
#include <AK/WeakPtr.h>
#include <LibCore/CEvent.h>
#include <LibCore/CLocalServer.h>
#include <LibThread/Lock.h>
#include <sys/select.h>
#include <sys/time.h>
#include <time.h>
class CObject;
class CNotifier;
class CEventLoop {
public:
CEventLoop();
~CEventLoop();
int exec();
enum class WaitMode {
WaitForEvents,
PollForEvents,
};
// processe events, generally called by exec() in a loop.
// this should really only be used for integrating with other event loops
void pump(WaitMode = WaitMode::WaitForEvents);
void post_event(CObject& receiver, NonnullOwnPtr<CEvent>&&);
static CEventLoop& main();
static CEventLoop& current();
bool was_exit_requested() const { return m_exit_requested; }
static int register_timer(CObject&, int milliseconds, bool should_reload, TimerShouldFireWhenNotVisible);
static bool unregister_timer(int timer_id);
static void register_notifier(Badge<CNotifier>, CNotifier&);
static void unregister_notifier(Badge<CNotifier>, CNotifier&);
void quit(int);
void unquit();
void take_pending_events_from(CEventLoop& other)
{
m_queued_events.append(move(other.m_queued_events));
}
static void wake();
private:
void wait_for_event(WaitMode);
void get_next_timer_expiration(timeval&);
struct QueuedEvent {
WeakPtr<CObject> receiver;
NonnullOwnPtr<CEvent> event;
};
Vector<QueuedEvent, 64> m_queued_events;
bool m_exit_requested { false };
int m_exit_code { 0 };
static int s_wake_pipe_fds[2];
LibThread::Lock m_lock;
struct EventLoopTimer {
int timer_id { 0 };
int interval { 0 };
timeval fire_time { 0, 0 };
bool should_reload { false };
TimerShouldFireWhenNotVisible fire_when_not_visible { TimerShouldFireWhenNotVisible::No };
WeakPtr<CObject> owner;
void reload(const timeval& now);
bool has_expired(const timeval& now) const;
};
static HashMap<int, NonnullOwnPtr<EventLoopTimer>>* s_timers;
static HashTable<CNotifier*>* s_notifiers;
static RefPtr<CLocalServer> s_rpc_server;
};