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/*
* Copyright 2014 Canonical Ltd.
*
* 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 warranties of
* MERCHANTABILITY, SATISFACTORY QUALITY, 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/>.
*
* Authors:
* Charles Kerr <charles.kerr@canonical.com>
*/
#include <datetime/wakeup-timer-uha.h>
#include <ubuntu/hardware/alarm.h>
#include <glib.h>
#include <unistd.h>
#include <ctime> // struct timespec
#include <mutex>
#include <thread>
namespace unity {
namespace indicator {
namespace datetime {
/***
****
***/
class UhaWakeupTimer::Impl
{
public:
Impl(const std::shared_ptr<Clock>& clock):
m_clock(clock),
m_hardware_alarm(u_hardware_alarm_create())
{
// fire up a worker thread that initially just sleeps
set_wakeup_time_to_the_distant_future();
m_thread = std::move(std::thread([&](){threadfunc();}));
}
~Impl()
{
// tell the worker thread to wake up and exit
m_yielding = true;
set_wakeup_time(m_clock->localtime().add_full(0,0,0,0,0,0.1));
// wait for it to happen
if (m_thread.joinable())
m_thread.join();
g_idle_remove_by_data(this);
u_hardware_alarm_unref(m_hardware_alarm);
}
void set_wakeup_time(const DateTime& d)
{
g_debug("%s %s", G_STRLOC, G_STRFUNC);
std::lock_guard<std::recursive_mutex> lg(m_mutex);
const auto diff_usec = d - m_clock->localtime();
struct timespec ts;
ts.tv_sec = diff_usec / G_USEC_PER_SEC;
ts.tv_nsec = (diff_usec % G_USEC_PER_SEC) * 1000;
g_debug("%s setting hardware wakeup time to %s (%zu seconds from now)",
G_STRFUNC, (size_t)ts.tv_sec, d.format("%F %T").c_str());
u_hardware_alarm_set_relative_to_with_behavior(m_hardware_alarm,
U_HARDWARE_ALARM_TIME_REFERENCE_NOW,
U_HARDWARE_ALARM_SLEEP_BEHAVIOR_WAKEUP_DEVICE,
&ts);
}
core::Signal<>& timeout() { return m_timeout; }
private:
void set_wakeup_time_to_the_distant_future()
{
const auto next_year = m_clock->localtime().add_full(1,0,0,0,0,0);
set_wakeup_time(next_year);
}
static gboolean kick_idle (gpointer gself)
{
static_cast<Impl*>(gself)->timeout();
return G_SOURCE_REMOVE;
}
void threadfunc()
{
while (!m_yielding)
{
// wait for the next hw alarm
UHardwareAlarmWaitResult wait_result;
auto rc = u_hardware_alarm_wait_for_next_alarm(m_hardware_alarm, &wait_result);
g_return_if_fail (rc == U_STATUS_SUCCESS);
// set a long wakeup interval for the next iteration of the loop.
// if there's another Appointment queued up by the Planner,
// our timeout() listener will call set_wakeup_time() to set the
// real wakeup interval.
set_wakeup_time_to_the_distant_future();
// delegate the kick back to the main thread
g_idle_add (kick_idle, this);
}
}
core::Signal<> m_timeout;
std::recursive_mutex m_mutex;
bool m_yielding = false;
const std::shared_ptr<Clock>& m_clock;
UHardwareAlarm m_hardware_alarm = nullptr;
std::thread m_thread;
};
/***
****
***/
UhaWakeupTimer::UhaWakeupTimer(const std::shared_ptr<Clock>& clock):
p(new Impl(clock))
{
}
UhaWakeupTimer::~UhaWakeupTimer()
{
}
bool UhaWakeupTimer::is_supported()
{
auto hw_alarm = u_hardware_alarm_create();
g_debug ("%s hardware alarm %p", G_STRFUNC, hw_alarm);
return hw_alarm != nullptr;
}
void UhaWakeupTimer::set_wakeup_time(const DateTime& d)
{
p->set_wakeup_time(d);
}
core::Signal<>& UhaWakeupTimer::timeout()
{
return p->timeout();
}
/***
****
***/
} // namespace datetime
} // namespace indicator
} // namespace unity
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