Re: C++ EH vs Forced Unwinding, Round 3

[Richard Henderson <rth at redhat dot com>]

On Fri, May 02, 2003 at 02:10:22PM -0700, Mark Mitchell wrote:
> Sorry; why is that non-negotiable?  I'm not sure why, in light of the
> discussion, we don't just have cancellation points do an entirely
> ordinary throw.

Because you nixed try/finally.

So C cleanups are left using setjmp, and those frames may be
interspersed with the C++ EH frames.  So longjmp_unwind has to
check each frame as it passes to discover if there are setjmp
cleanups to be invoked.  If longjmp_unwind loses control, then
things don't work as advertised.



r~