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Subject: Re: wake_up from interrupt handler
From: Arjan van de Ven <arjanv@redhat.com>
To: Amol Lad <dal_loma@yahoo.com>
Cc: linux-kernel@vger.kernel.org
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On Mon, 2002-10-07 at 14:41, Amol Lad wrote:
> Hi,
>  I have a kernel thread which did add_to_wait_queue()
> to wait for an event.=20
> The event for which above thread is waiting occurs in
> an interrupt handler that calls wake_up() to wake the
> above thread.=20
> Now I am faced with a 'lost wakeup' problem, in which
> the   =20
> kernel thread checks whether event occured, he finds
> it to be 'not-occured' but before calling
> add_to_wait_queue(), interrupt handler detects that
> the event has occured and calls wake_up().
> My thread sleeps forever.

set_current_state(TASK_INTERRUPTIBLE);
add_to_wait_queue(...);
if (even_occured) { ...}=20
  else
     schedule();
=20
remove_from_wait_queue(..);
set_current_state(TASK_RUNNABLE);


>=20


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