[Xcb] XCB error handling; my penultimate proposal

[Barton C Massey]

Actually, (1) isn't what the APIs describe now, although
it's close.  If we were to make the current API do (1), then
applications that didn't check *Reply() for null on *every*
request would lose, and you would still have to put an error
handler in the event loop to handle errors from non-reply
requests.

So Keithp's proposal (4) is that we do the above; if
desired, we can extend with a bunch of *Nerr() requests ala
my proposal (3) later to get Jamey's functionality.

Comments?  Especially from someone other than the three of
us?

	Bart

In message <1134963912.8789.4.camel at evo.keithp.com> you wrote:
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> On Sun, 2005-12-18 at 09:32 -0800, Barton C Massey wrote:
> 
> > Of course, my favorite is alternative 3: "let's do both!"
> 
> I suggest that we can implement 1) now (it's what the API looks like)
> and see if anyone finds reasonable uses for 2), at which point we can
> add it using Bart's suggested APIs.
> 
> While the uniform behaviour of always processing errors through the
> normal event loop is appealingly symmetrical, I'm afraid I haven't seen
> any substantive use cases where this is better than returning errors
> where the reply would have been, and there are plenty of examples where
> returning the error precisely where the reply would have been makes
> things far easier.
> 
> We can obviously add Bart's APIs in a later release; I only suggest that
> we hold off until we find a compelling reason to extend the library in
> this fashion.
> 
> -keith
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From: Barton C Massey <bart at cs.pdx.edu>
Subject: [Xcb] XCB error handling; my penultimate proposal
Date: Sun, 18 Dec 2005 09:32:22 -0800
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