From a396e6af3cd16530202f6cbecbd45c7a3f6ac893 Mon Sep 17 00:00:00 2001
From: Charles Kerr <charles.kerr@canonical.com>
Date: Thu, 24 Apr 2014 22:34:42 -0500
Subject: hw alarms

---
 src/wakeup-timer-uha.cpp | 168 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 src/wakeup-timer-uha.cpp

(limited to 'src/wakeup-timer-uha.cpp')

diff --git a/src/wakeup-timer-uha.cpp b/src/wakeup-timer-uha.cpp
new file mode 100644
index 0000000..dda109f
--- /dev/null
+++ b/src/wakeup-timer-uha.cpp
@@ -0,0 +1,168 @@
+/*
+ * 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_message("%s %s", G_STRLOC, G_STRFUNC);
+        std::lock_guard<std::recursive_mutex> lg(m_mutex);
+
+        g_message("%s setting hardware wakeup time to %s", G_STRFUNC, d.format("%F %T").c_str());
+
+        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_message("%s setting hardware alarm to kick %zu seconds from now", G_STRFUNC, (size_t)ts.tv_sec);
+        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 foo = u_hardware_alarm_create();
+    g_message ("%s hardware alarm %p", G_STRFUNC, foo);
+    return foo != 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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