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authorJohn Stultz <john.stultz@linaro.org>2011-08-10 23:30:21 +0400
committerJohn Stultz <john.stultz@linaro.org>2011-08-11 01:55:27 +0400
commita28cde81ab13cc251748a4c4ef06883dd09a10ea (patch)
treeb38ce180912957731cfe736d1d3f978342d099e1 /include/linux/alarmtimer.h
parent9e26476243e438f4534a562660c1296a15a9e202 (diff)
downloadlinux-a28cde81ab13cc251748a4c4ef06883dd09a10ea.tar.xz
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>
Diffstat (limited to 'include/linux/alarmtimer.h')
-rw-r--r--include/linux/alarmtimer.h34
1 files changed, 33 insertions, 1 deletions
diff --git a/include/linux/alarmtimer.h b/include/linux/alarmtimer.h
index c854a8efa863..304124a6c982 100644
--- a/include/linux/alarmtimer.h
+++ b/include/linux/alarmtimer.h
@@ -18,6 +18,11 @@ enum alarmtimer_restart {
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 alarm {
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 @@ void alarm_cancel(struct alarm *alarm);
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