Re: wait_event_interruptible_timeout problem

Robert Hancock
2005-09-13T23:30:19Z

manomugdha biswas wrote:
> Hi,
> I have a kernel module (kernel 2.6) where I have
> opened multiple tcp connections. when there is no
> data
> i want my process to sleep. For that i have added
> the
> following code.
>
> /* Initialise the wait q head */
> init_waitqueue_head(&VNICClientWQHead);
>
> init_waitqueue_entry(&(currentMap->waitQ), current);
> add_wait_queue(currentMap->sock->sk->sk_sleep,
> &(currentMap->waitQ));
>
> /* here currentMap is a structure containing tcp
> conenction info for my module. There is a currentMap
> for each tcp connection */
>
> wait_event_interruptible_timeout(VNICClientWQHead,
> 0, HZ * 100000);
>
> I am not sure about the condition argument, 0.

The condition should be an expression that returns true when whatever
you are waiting for occurs - in this case when data is available. If you
put the condition as 0 it will never wake up.

Also, why the huge timeout? If you just want to sleep forever, use
regular wait_event_interruptible.

--
Robert Hancock Saskatoon, SK, Canada
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