Re: wait_event_interruptible_timeout problem

[Robert Hancock <hancockr@shaw.ca>]

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
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/


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