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authorTejun Heo <tj@kernel.org>2013-03-12 11:30:04 -0700
committerTejun Heo <tj@kernel.org>2013-03-12 11:30:04 -0700
commit9e8cd2f5898ab6710ad81f4583fada08bf8049a4 (patch)
treebb3950d07a5e23be7817eaaa0517066b7d5f82fb /include/linux/workqueue.h
parentc9178087acd71b4ea010ea48e147cf66952d2da9 (diff)
workqueue: implement apply_workqueue_attrs()
Implement apply_workqueue_attrs() which applies workqueue_attrs to the specified unbound workqueue by creating a new pwq (pool_workqueue) linked to worker_pool with the specified attributes. A new pwq is linked at the head of wq->pwqs instead of tail and __queue_work() verifies that the first unbound pwq has positive refcnt before choosing it for the actual queueing. This is to cover the case where creation of a new pwq races with queueing. As base ref on a pwq won't be dropped without making another pwq the first one, __queue_work() is guaranteed to make progress and not add work item to a dead pwq. init_and_link_pwq() is updated to return the last first pwq the new pwq replaced, which is put by apply_workqueue_attrs(). Note that apply_workqueue_attrs() is almost identical to unbound pwq part of alloc_and_link_pwqs(). The only difference is that there is no previous first pwq. apply_workqueue_attrs() is implemented to handle such cases and replaces unbound pwq handling in alloc_and_link_pwqs(). Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Diffstat (limited to 'include/linux/workqueue.h')
-rw-r--r--include/linux/workqueue.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index c270b4eedf16..e152394fa7eb 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -410,6 +410,8 @@ extern void destroy_workqueue(struct workqueue_struct *wq);
struct workqueue_attrs *alloc_workqueue_attrs(gfp_t gfp_mask);
void free_workqueue_attrs(struct workqueue_attrs *attrs);
+int apply_workqueue_attrs(struct workqueue_struct *wq,
+ const struct workqueue_attrs *attrs);
extern bool queue_work_on(int cpu, struct workqueue_struct *wq,
struct work_struct *work);