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authorTejun Heo <tj@kernel.org>2011-04-05 18:01:44 +0200
committerTejun Heo <tj@kernel.org>2011-05-20 13:54:46 +0200
commit9c5a2ba70251ecaab18c7a83e38b3c620223476c (patch)
treeece2c035b761af1332ea027f32443a6d05b16bc9 /include/linux/workqueue.h
parent2543a87108d2af7d48a43b3d6685c2b1ea279e36 (diff)
workqueue: separate out drain_workqueue() from destroy_workqueue()
There are users which want to drain workqueues without destroying it. Separate out drain functionality from destroy_workqueue() into drain_workqueue() and make it accessible to workqueue users. To guarantee forward-progress, only chain queueing is allowed while drain is in progress. If a new work item which isn't chained from the running or pending work items is queued while draining is in progress, WARN_ON_ONCE() is triggered. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: James Bottomley <James.Bottomley@hansenpartnership.com>
Diffstat (limited to 'include/linux/workqueue.h')
-rw-r--r--include/linux/workqueue.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 57b31b3d83b..2be2887c695 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -255,7 +255,7 @@ enum {
WQ_HIGHPRI = 1 << 4, /* high priority */
WQ_CPU_INTENSIVE = 1 << 5, /* cpu instensive workqueue */
- WQ_DYING = 1 << 6, /* internal: workqueue is dying */
+ WQ_DRAINING = 1 << 6, /* internal: workqueue is draining */
WQ_RESCUER = 1 << 7, /* internal: workqueue has rescuer */
WQ_MAX_ACTIVE = 512, /* I like 512, better ideas? */
@@ -355,6 +355,7 @@ extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
struct delayed_work *work, unsigned long delay);
extern void flush_workqueue(struct workqueue_struct *wq);
+extern void drain_workqueue(struct workqueue_struct *wq);
extern void flush_scheduled_work(void);
extern int schedule_work(struct work_struct *work);