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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-09-15 14:43:03 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-15 16:01:05 +0200
commite9c8431185d6c406887190519f6dbdd112641686 (patch)
tree3c502201451df7bbfcd653fee940fcb40bdaaeb6 /include/linux/sched.h
parent5f3edc1b1ead6d9bd45a85c551f44eff8fe76b9f (diff)
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sched: Add TASK_WAKING
We're going to want to drop rq->lock in try_to_wake_up() for a longer period of time, however we also want to deal with concurrent waking of the same task, which is currently handled by holding rq->lock. So introduce a new TASK state, namely TASK_WAKING, which indicates someone is already waking the task (other wakers will fail p->state & state). We also keep preemption disabled over the whole ttwu(). Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5d3c990..3b0ca66 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -190,6 +190,7 @@ extern unsigned long long time_sync_thresh;
/* in tsk->state again */
#define TASK_DEAD 64
#define TASK_WAKEKILL 128
+#define TASK_WAKING 256
/* Convenience macros for the sake of set_task_state */
#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
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