How to wake_up the wait_queue of a socket?

[horseriver]

On Fri, Jan 18, 2013 at 10:18:19AM +0800, Peter Teoh wrote:
> essentially, when the packet arrive, it will be assigned to the correct
> process based on IP address + port matching, and then the corresponding
> process's blocked scheduling status will be changed to continue execution,
> so that when the scheduler next selection of runnable process will pick him
> out for continue execution.   The process will then pick his data up from
> the network queue.
> 

  Thanks!

  If there is no event occured on one socket descriptor  , 
  will the poll operation on this socket descriptor be blocked ?   
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> 
> -- 
> Regards,
> Peter Teoh