[linux-dvb] Re: wait_event_interruptible_timeout not working correctly

[Michael Hunold <hunold@convergence.de>]

Hello,

On 03/12/04 01:42, Ralph Metzler wrote:
> Andrew de Quincey writes:
>  > 
>  > If you look in dvb_frontend_thread(), there is a main loop with the following call:
>  > timeout = wait_event_interruptible_timeout(fe->wait_queue,0 != dvb_frontend_is_exiting (fe), delay);
>  > 
>  > This sleeps for a delay of 3*HZ (initially), or until the frontend thread is told to exit, or the wait queue is woken up.
>
>
> No, internally it will wake up when the wait queue is woken but
> it will go back to sleep (schedule()) if the condition is not met.
> See /usr/src/linux/include/linux/sched.h or wait.h (depending on
> kernel version)
Argh. Thanks for the hint. I recently replaced the usage of 
interruptible_sleep_on_timeout() with wait_event_interruptible_timeout() 
and apparently did not fully understand the differences.

> If you want to use it you will have to use some extra flag which 
> indicates that tuning is needed and check for dvb_frontend_exiting
> and (or rather OR) this flag as a wakeup condition.
Right.

Andrew, do you fix this problem by yourself or do you want me to change 
it so it works like before?

> Ralph
CU
Michael.


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