Re: include: Add support for executing finally code for exceptions without using a separate function.

[Alexandre Julliard]

Robert Shearman <rob(a)codeweavers.com> writes:
> The first goal is accomplished by changing the previous two-state
> variable of __first into a three-state variable where the third state
> is the state in which the finally code is executed in the normal
> case. The second goal is accomplished by calling sigsetjmp in
> __wine_finally_handler to give the finally code a place to jump back
> to after it has finished executing.

That can't work, once you longjmp into the finally block you can't
longjmp back, since you are no longer inside the function that did the
setjmp.

-- 
Alexandre Julliard
julliard(a)winehq.org

include: Add support for executing finally code for exceptions without using a separate function.

[Robert Shearman]

Alexandre Julliard wrote:
> Robert Shearman <rob(a)codeweavers.com> writes:
> > The first goal is accomplished by changing the previous two-state
> > variable of __first into a three-state variable where the third state
> > is the state in which the finally code is executed in the normal
> > case. The second goal is accomplished by calling sigsetjmp in
> > __wine_finally_handler to give the finally code a place to jump back
> > to after it has finished executing.
>
> That can't work, once you longjmp into the finally block you can't
> longjmp back, since you are no longer inside the function that did the
> setjmp.

Ah, yes. I thought there might be some caveat like that on the use of 
longjmp, but I couldn't break it with any of the tests I did. I can see 
why it wouldn't work on all platforms or in all circumstances.

-- 
Rob Shearman