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Postings from January 2001
On Tue, Jan 09, 2001 at 07:04:58AM -0500, Horsley Tom wrote:
> > >Hello, hello - any experts out there?
> >
> > Apparently not. I cannot at present think what sigsetjmp() gains
> > us. Do you have an guidelines which say "use sigsetjmp() if
> > your code does X?"
>
> I'm no expert, but:
>
> On most systems I know of, the guideline is what the name implies.
> If you want to longjmp out of a signal handler, you need to use the
> sig versions of the routines since there are signal frames and extra
> process state cleanups that have to happen.
and as you can install any perl subroutine as a signal handler, I'd infer
that any part of perl might actually be running in a signal handler.
[and might die back out to an eval that started before %SIG{} was touched,
so I don't even think the idea of switching to sigsetjump() when the first
%SIG{} assignment is made would work]
I don't think it's possible to win.
Nicholas Clark
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