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-rw-r--r--include/linux/hrtimer.h16
-rw-r--r--kernel/hrtimer.c19
2 files changed, 35 insertions, 0 deletions
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 93830158348..b2093928761 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -58,6 +58,19 @@ struct hrtimer {
};
/**
+ * struct hrtimer_sleeper - simple sleeper structure
+ *
+ * @timer: embedded timer structure
+ * @task: task to wake up
+ *
+ * task is set to NULL, when the timer expires.
+ */
+struct hrtimer_sleeper {
+ struct hrtimer timer;
+ struct task_struct *task;
+};
+
+/**
* struct hrtimer_base - the timer base for a specific clock
*
* @index: clock type index for per_cpu support when moving a timer
@@ -127,6 +140,9 @@ extern long hrtimer_nanosleep(struct timespec *rqtp,
const enum hrtimer_mode mode,
const clockid_t clockid);
+extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
+ struct task_struct *tsk);
+
/* Soft interrupt function to run the hrtimer queues: */
extern void hrtimer_run_queues(void);
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 0237a556eb1..877cdf9678b 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -656,6 +656,25 @@ void hrtimer_run_queues(void)
* Sleep related functions:
*/
+static int hrtimer_wakeup(struct hrtimer *timer)
+{
+ struct hrtimer_sleeper *t =
+ container_of(timer, struct hrtimer_sleeper, timer);
+ struct task_struct *task = t->task;
+
+ t->task = NULL;
+ if (task)
+ wake_up_process(task);
+
+ return HRTIMER_NORESTART;
+}
+
+void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, task_t *task)
+{
+ sl->timer.function = hrtimer_wakeup;
+ sl->task = task;
+}
+
struct sleep_hrtimer {
struct hrtimer timer;
struct task_struct *task;