提交 8c53e463 编写于 作者: L Linus Torvalds

workqueue: add 'flush_delayed_work()' to run and wait for delayed work

It basically turns a delayed work into an immediate work, and then waits
for it to finish, thus allowing you to force (and wait for) an immediate
flush of a delayed work.

We'll want to use this in the tty layer to clean up tty_flush_to_ldisc().
Acked-by: NOleg Nesterov <oleg@redhat.com>
[ Fixed to use 'del_timer_sync()' as noted by Oleg ]
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 c8e33141
...@@ -207,6 +207,7 @@ extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq, ...@@ -207,6 +207,7 @@ extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
extern void flush_workqueue(struct workqueue_struct *wq); extern void flush_workqueue(struct workqueue_struct *wq);
extern void flush_scheduled_work(void); extern void flush_scheduled_work(void);
extern void flush_delayed_work(struct delayed_work *work);
extern int schedule_work(struct work_struct *work); extern int schedule_work(struct work_struct *work);
extern int schedule_work_on(int cpu, struct work_struct *work); extern int schedule_work_on(int cpu, struct work_struct *work);
......
...@@ -639,6 +639,24 @@ int schedule_delayed_work(struct delayed_work *dwork, ...@@ -639,6 +639,24 @@ int schedule_delayed_work(struct delayed_work *dwork,
} }
EXPORT_SYMBOL(schedule_delayed_work); EXPORT_SYMBOL(schedule_delayed_work);
/**
* flush_delayed_work - block until a dwork_struct's callback has terminated
* @dwork: the delayed work which is to be flushed
*
* Any timeout is cancelled, and any pending work is run immediately.
*/
void flush_delayed_work(struct delayed_work *dwork)
{
if (del_timer_sync(&dwork->timer)) {
struct cpu_workqueue_struct *cwq;
cwq = wq_per_cpu(keventd_wq, get_cpu());
__queue_work(cwq, &dwork->work);
put_cpu();
}
flush_work(&dwork->work);
}
EXPORT_SYMBOL(flush_delayed_work);
/** /**
* schedule_delayed_work_on - queue work in global workqueue on CPU after delay * schedule_delayed_work_on - queue work in global workqueue on CPU after delay
* @cpu: cpu to use * @cpu: cpu to use
......
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