[cairo] Making it easier to track down errors

[Owen Taylor]

On Fri, 2005-06-17 at 11:24 -0700, Carl Worth wrote:
> On Thu, 16 Jun 2005 22:55:54 +0200 (CEST), Olivier Andrieu wrote:
> > Nice. Would it be safe for language bindings to raise exceptions at
> > this point ? (That means that the _cairo_error() call would not return
> > and the calling function should have done all its cleanup before it
> > calls _cairo_error).
> 
> I think we could quite easily guarantee that the most cairo would ever
> want to do after _cairo_error is to return (and perhaps return a
> value) from a cairo entry point.
> 
> In fact, the implementation is extremely close to that already. And
> the attached patch shuffles the few calls to free needed in order to
> completely satisfy that constraint. I've gone ahead and committed it
> now, (the close examination of every _cairo_error call turned up a
> couple of bugs that I had reintroduced which are also fixed in this
> patch).

This absolutely doesn't work ... Cairo can guarantee it's own behavior,
it can't guarantee the behavior of other libraries that might use
Cairo internally; and it's very plausible that a cairo_t might be
shared between direct usage from the language binding and usage
from a library that uses cairo internally.

Regards,
						Owen

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