[lkml]   [2004]   [Feb]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: keventd_create_kthread
Srivatsa Vaddagiri <> wrote:
> On Thu, Feb 19, 2004 at 08:12:19AM +0000, Andrew Morton wrote:
> > However, if that wake_up_process() comes too early we'll just flip the new
> > thread out of TASK_INTERUPTIBLE into TASK_RUNNING and the schedule() in
> > kthread() will fall straight through. So perhaps we can simply remove the
> > wait_task_inactive()?
> If wake_up_process() comes too early (when the target task is still
> in TASK_RUNNING state), then won't wake_up_process() be a no-op?
> In which case, the target kthread will miss a wake-up event
> (kthread_start/kthread_stop)?

No, that's OK - the new kernel thread sets TASK_INTERRUPTIBLE before waking
the invoking thread via complete():

new thread:

/* OK, tell user we're spawned, wait for stop or wakeup */


create->result = find_task_by_pid(pid);

It's the window after the complete() and before the schedule() where
wait_task_inactive() is spinning.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 14:01    [W:0.038 / U:4.380 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site