From: Matthew Bloch <mattbee@...>
Date: 2002-07-18T00:08:39+09:00
Subject: Re: Patch to stop TCPSocket.new blocking on DNS lookups

On Wednesday 17 July 2002 15:34, you wrote:
> >>>>> "M" == Matthew Bloch <mattbee@soup-kitchen.net> writes:
>
> M> being made asychronous in the same manner.  And of course there's the
> fact M> that there's no Win32 implementation (or does Win32 sockets do
> asychronous M> DNS already?).
>
>  Well, getaddrinfo_a() is available only for glibc >= 2.2.4, no ?

Yup, I believe it's a pretty new call.  But unless we roll a DNS resolver 
into Ruby itself, an asynchronous resolver has to add an extra external 
dependency-- I'd rather it were glibc than anything else.

>  Have you looked at ADNS (GPL license) or cURL resolver ?

I have, but these would require larger architectural changes to the socket 
library which I don't really have time to do.  There are still some blocking 
calls left in there, but the most common one (to getaddrinfo, on connection) 
is sorted with the patch; and the function is only used where it's available, 
otherwise it drops back to the old behaviour.

-- 
Matthew Bloch         Bytemark Computer Consulting Limited
                                http://www.bytemark.co.uk/
                                  tel. +44 (0) 8707 455026