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authorThomas Gleixner <tglx@linutronix.de>2006-03-31 02:31:17 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-31 12:18:58 -0800
commit00362e33f65f1cb5d15e62ea5509520ce2770360 (patch)
tree02694b1416f3d98c4eebaeca7864c7fd3bad6fa0
parent2bfb646cdf348cb77c572f06d5b9d17ea205c7e2 (diff)
downloadop-kernel-dev-00362e33f65f1cb5d15e62ea5509520ce2770360.zip
op-kernel-dev-00362e33f65f1cb5d15e62ea5509520ce2770360.tar.gz
[PATCH] hrtimer: create generic sleeper
The removal of the data field in the hrtimer structure enforces the embedding of the timer into another data structure. nanosleep now uses a private implementation of the most common used timer callback function (simple task wakeup). In order to avoid the reimplentation of such functionality all over the place a generic hrtimer_sleeper functionality is created. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-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 9383015..b209392 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 0237a55..877cdf96 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;
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