Non-blocking socket IO under Win32 is tricky, but not impossible. Have a look at Re: (to be updated) (tye)Re: Non blocking socket open -- it should help. 
   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

In reply to Re: Win32 equivalant to Errno 'EWOULDBLOCK' by MeowChow
in thread Win32 equivalant to Errno 'EWOULDBLOCK' by otijim

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