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/*
* 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;
};
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