alarmtimers: Add more refined alarm state tracking
In order to allow for functionality like try_to_cancel, add
more refined state tracking (similar to hrtimers).
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/include/linux/alarmtimer.h b/include/linux/alarmtimer.h
index c854a8e..304124a 100644
--- a/include/linux/alarmtimer.h
+++ b/include/linux/alarmtimer.h
@@ -18,6 +18,11 @@
ALARMTIMER_RESTART,
};
+
+#define ALARMTIMER_STATE_INACTIVE 0x00
+#define ALARMTIMER_STATE_ENQUEUED 0x01
+#define ALARMTIMER_STATE_CALLBACK 0x02
+
/**
* struct alarm - Alarm timer structure
* @node: timerqueue node for adding to the event list this value
@@ -32,7 +37,7 @@
struct timerqueue_node node;
enum alarmtimer_restart (*function)(struct alarm *, ktime_t now);
enum alarmtimer_type type;
- bool enabled;
+ int state;
void *data;
};
@@ -43,4 +48,31 @@
u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);
+/*
+ * A alarmtimer is active, when it is enqueued into timerqueue or the
+ * callback function is running.
+ */
+static inline int alarmtimer_active(const struct alarm *timer)
+{
+ return timer->state != ALARMTIMER_STATE_INACTIVE;
+}
+
+/*
+ * Helper function to check, whether the timer is on one of the queues
+ */
+static inline int alarmtimer_is_queued(struct alarm *timer)
+{
+ return timer->state & ALARMTIMER_STATE_ENQUEUED;
+}
+
+/*
+ * Helper function to check, whether the timer is running the callback
+ * function
+ */
+static inline int alarmtimer_callback_running(struct alarm *timer)
+{
+ return timer->state & ALARMTIMER_STATE_CALLBACK;
+}
+
+
#endif