On Mon, 7 Oct 2002, Amol Lad wrote:
> Hi,
> I have a kernel thread which did add_to_wait_queue()
> to wait for an event.
> The event for which above thread is waiting occurs in
> an interrupt handler that calls wake_up() to wake the
> above thread.
> Now I am faced with a 'lost wakeup' problem, in which
> the
> 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.
I believe the solution is to simply add_to_wait_queue()
_before_ checking the condition. If the signal arrives between
checking the condition and going to sleep your task will be
immediately awoken.
Rui Sousa
> I know some new APIs are provided in recent 2.5
> kernel, but how to avoid this in 2.4.18
>
> please CC me
>
> Thanks
> Amol
>
>
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This archive was generated by hypermail 2b29 : Mon Oct 07 2002 - 22:01:01 EST