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From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: Tasking issues
Date: Mon, 13 Aug 2007 20:54:53 +0100
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Date: 2007-08-13T20:54:53+01:00
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shaunpatterson@gmail.com writes:

> I'd have to check, but I was SURE I set the GNAT Sockets to
> non-blocking... which (I assume) would allow the other thread to
> run.

Do you mean you called GNAT.Sockets.Initialize (Process_Blocking_IO =>
True)?  (it's a lot of work to set a socket non-blocking, I don't
think you would easily forget). Not sure this has the effect you want.

I would expect a read from a non-blocking socket that didn't have
(enough) input to end with an End_Error exception usually .. or a
Socket_Error with EWOULDBLOCK .. or, as someone else suggested, to eat
CPU.

Unless you really need to do otherwise it's easiest to use ordinary
(blocking) IO on the sockets, one task to read from each socket. (You
could check out GNAT.Sockets' Selector_Type & Socket_Set_Type).