Well, things have changed since I looked last. Thanks for explaining. FWIW, back in the nineties we just wrote our own setjmp/longjmp for VMS to avoid stack un

Well, things have changed since I looked last. Thanks for explaining. FWIW, back in the nineties we just wrote our own setjmp/longjmp for VMS to avoid stack unwind - save registers / restore registers. We used it to implement coroutines in Modula 2, iirc.