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/* -*- Mode: Vala; indent-tabs-mode: nil; tab-width: 4 -*-
*
* Copyright (C) 2014 Canonical Ltd
* Copyright (C) 2017 Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
public delegate void IdleMonitorWatchFunc (IdleMonitor monitor, uint id);
public class IdleMonitor
{
private unowned X.Display display;
private HashTable<uint, IdleMonitorWatch> watches;
private GenericSet<uint32> alarms;
private int sync_event_base;
private X.ID counter;
private X.ID user_active_alarm;
private int serial = 0;
public IdleMonitor ()
{
watches = new HashTable<uint, IdleMonitorWatch> (null, null);
alarms = new GenericSet<uint32> (null, null);
init_xsync ();
}
~IdleMonitor ()
{
foreach (var watch in watches.get_values ())
remove_watch (watch.id);
if (user_active_alarm != X.None)
X.Sync.DestroyAlarm (display, user_active_alarm);
/* Note this is a bit weird, since we need to pass null as the window by Vala treats this as a method */
Gdk.Window w = null;
w.remove_filter (xevent_filter);
}
public uint add_idle_watch (uint64 interval_msec, IdleMonitorWatchFunc callback)
{
var watch = make_watch (xsync_alarm_set (X.Sync.TestType.PositiveTransition, interval_msec, true), callback);
alarms.add ((uint32) watch.xalarm);
return watch.id;
}
public uint add_user_active_watch (IdleMonitorWatchFunc callback)
{
set_alarm_enabled (display, user_active_alarm, true);
var watch = make_watch (user_active_alarm, callback);
return watch.id;
}
public void remove_watch (uint id)
{
var watch = watches.lookup (id);
watches.remove (id);
if (watch.xalarm != user_active_alarm)
X.Sync.DestroyAlarm (display, watch.xalarm);
}
private void init_xsync ()
{
var d = Gdk.Display.get_default ();
if (!(d is Gdk.X11.Display))
{
warning ("Only support idle monitor under X");
return;
}
display = (d as Gdk.X11.Display).get_xdisplay ();
int sync_error_base;
var res = X.Sync.QueryExtension (display, out sync_event_base, out sync_error_base);
if (res == 0)
{
warning ("IdleMonitor: Sync extension not present");
return;
}
int major, minor;
res = X.Sync.Initialize (display, out major, out minor);
if (res == 0)
{
warning ("IdleMonitor: Unable to initialize Sync extension");
return;
}
counter = find_idletime_counter ();
/* IDLETIME counter not found? */
if (counter == X.None)
return;
user_active_alarm = xsync_alarm_set (X.Sync.TestType.NegativeTransition, 1, false);
/* Note this is a bit weird, since we need to pass null as the window by Vala treats this as a method */
Gdk.Window w = null;
w.add_filter (xevent_filter);
}
private Gdk.FilterReturn xevent_filter (Gdk.XEvent xevent, Gdk.Event event)
{
var ev = (X.Event*) xevent;
if (ev.xany.type != sync_event_base + X.Sync.AlarmNotify)
return Gdk.FilterReturn.CONTINUE;
var alarm_event = (X.Sync.AlarmNotifyEvent*) xevent;
handle_alarm_notify_event (alarm_event);
return Gdk.FilterReturn.CONTINUE;
}
private IdleMonitorWatch make_watch (X.ID xalarm, IdleMonitorWatchFunc callback)
{
var watch = new IdleMonitorWatch ();
watch.id = get_next_watch_serial ();
watch.callback = callback;
watch.xalarm = xalarm;
watches.insert (watch.id, watch);
return watch;
}
private X.ID xsync_alarm_set (X.Sync.TestType test_type, uint64 interval, bool want_events)
{
var attr = X.Sync.AlarmAttributes ();
X.Sync.Value delta;
X.Sync.IntToValue (out delta, 0);
attr.trigger.counter = counter;
attr.trigger.value_type = X.Sync.ValueType.Absolute;
attr.delta = delta;
attr.events = want_events;
X.Sync.IntsToValue (out attr.trigger.wait_value, (uint) interval, (int) (interval >> 32));
attr.trigger.test_type = test_type;
return X.Sync.CreateAlarm (display, X.Sync.CA.Counter | X.Sync.CA.ValueType | X.Sync.CA.TestType | X.Sync.CA.Value | X.Sync.CA.Delta | X.Sync.CA.Events, attr);
}
private void ensure_alarm_rescheduled (X.Display dpy, X.ID alarm)
{
/* Some versions of Xorg have an issue where alarms aren't
* always rescheduled. Calling X.Sync.ChangeAlarm, even
* without any attributes, will reschedule the alarm. */
var attr = X.Sync.AlarmAttributes ();
X.Sync.ChangeAlarm (dpy, alarm, 0, attr);
}
private void set_alarm_enabled (X.Display dpy, X.ID alarm, bool enabled)
{
var attr = X.Sync.AlarmAttributes ();
attr.events = enabled;
X.Sync.ChangeAlarm (dpy, alarm, X.Sync.CA.Events, attr);
}
private void handle_alarm_notify_event (X.Sync.AlarmNotifyEvent* alarm_event)
{
if (alarm_event.state != X.Sync.AlarmState.Active)
return;
var alarm = alarm_event.alarm;
var has_alarm = false;
if (alarm == user_active_alarm)
{
set_alarm_enabled (display, alarm, false);
has_alarm = true;
}
else if (alarms.contains ((uint32) alarm))
{
ensure_alarm_rescheduled (display, alarm);
has_alarm = true;
}
if (has_alarm)
{
foreach (var watch in watches.get_values ())
fire_watch (watch, alarm);
}
}
private void fire_watch (IdleMonitorWatch watch, X.ID alarm)
{
if (watch.xalarm != alarm)
return;
if (watch.callback != null)
watch.callback (this, watch.id);
if (watch.xalarm == user_active_alarm)
remove_watch (watch.id);
}
private X.ID find_idletime_counter ()
{
X.ID counter = X.None;
int ncounters;
var counters = X.Sync.ListSystemCounters (display, out ncounters);
for (var i = 0; i < ncounters; i++)
{
if (counters[i].name != null && strcmp (counters[i].name, "IDLETIME") == 0)
{
counter = counters[i].counter;
break;
}
}
X.Sync.FreeSystemCounterList (counters);
return counter;
}
private uint32 get_next_watch_serial ()
{
AtomicInt.inc (ref serial);
return serial;
}
}
public class IdleMonitorWatch
{
public uint id;
public unowned IdleMonitorWatchFunc callback;
public X.ID xalarm;
}
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