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workqueue: implement WQ_NON_REENTRANT

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With gcwq managing all the workers and work->data pointing to the last
gcwq it was on, non-reentrance can be easily implemented by checking
whether the work is still running on the previous gcwq on queueing.
Implement it.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2010-06-29 10:07:13 +02:00
parent 7a22ad757e
commit 18aa9effad
2 changed files with 30 additions and 3 deletions
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1
include/linux/workqueue.h
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@ -225,6 +225,7 @@ static inline unsigned int work_static(struct work_struct *work) { return 0; }
enum {
WQ_FREEZEABLE = 1 << 0, /* freeze during suspend */
WQ_SINGLE_CPU = 1 << 1, /* only single cpu at a time */
WQ_NON_REENTRANT = 1 << 2, /* guarantee non-reentrance */
};
extern struct workqueue_struct *