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UNWIND-PROTECT
- To: KMP at MIT-MC, RWK at MIT-MC
- Subject: UNWIND-PROTECT
- From: JONL at MIT-MC (Jon L White)
- Date: Tue, 29 Apr 80 20:09:00 GMT
- Cc: (BUG LISP) at MIT-MC
- Original-date: 29 APR 1980 1609-EDT
On the 15th of Feb, KMP sent out a bug notice about UNWIND-PROTECT
losing, for which I made the diagnosis that ERRSET was not saving
and restoring the UNREAL flag. The test case is
(DEFUN KMP-LOSES () (ERRSET (UNWIND-PROTECT NIL (OPEN '((DSK BOO) BAR BZ)))))
Well, I found a way to fix ERRSET without taking more pdl positions,
and the assembled code (already initialized) is on LISP;BBLISP 995QIO.
If that really works, then we should dump this out as XLISP, and
maybe think about holding off on the extended definition of WITHOUT-
INTERRUPTS - i.e., merely go back for now to using the "clean-up"
clauses of an UNWIND-PROTECT.
Also, you will note that this new lisp (1995) has LEXPR-FUNCALL.
Comments solicited.