Path: csiph.com!weretis.net!feeder9.news.weretis.net!panix!.POSTED.spitfire.i.gajendra.net!not-for-mail
From: cross@spitfire.i.gajendra.net (Dan Cross)
Newsgroups: comp.os.linux.misc,alt.folklore.computers
Subject: Re: Naughty =?UTF-8?Q?C=E2=99=AF?=
Date: Tue, 6 Jan 2026 19:59:54 -0000 (UTC)
Organization: PANIX Public Access Internet and UNIX, NYC
Message-ID: <10jjpjq$p56$2@reader2.panix.com>
References: <CtydnVqzjrtfd5P0nZ2dnZfqn_adnZ2d@giganews.com> <10jjc9s$3uhtk$1@dont-email.me> <10jjd2a$e8$2@reader2.panix.com> <84c7R.819121$PGrb.160843@fx10.iad>
Injection-Date: Tue, 6 Jan 2026 19:59:54 -0000 (UTC)
Injection-Info: reader2.panix.com; posting-host="spitfire.i.gajendra.net:166.84.136.80"; logging-data="25766"; mail-complaints-to="abuse@panix.com"
X-Newsreader: trn 4.0-test77 (Sep 1, 2010)
Originator: cross@spitfire.i.gajendra.net (Dan Cross)
Xref: csiph.com comp.os.linux.misc:80613 alt.folklore.computers:233283

In article <84c7R.819121$PGrb.160843@fx10.iad>,
Scott Lurndal <slp53@pacbell.net> wrote:
>cross@spitfire.i.gajendra.net (Dan Cross) writes:
>>In article <10jjc9s$3uhtk$1@dont-email.me>,
>>Chris Ahlstrom  <OFeem1987@teleworm.us> wrote:
>>>Waldek Hebisch wrote this post by blinking in Morse code:
>>>
>>>> In alt.folklore.computers c186282 <c186282@nnada.net> wrote:
>>>> <snip> 
>>>>>   Hmm ... look at all the GNU 'compilers' -
>>>>>   FORTRAN, COBOL, Ada, 'D', M2, Rust,C++,
>>>>>   G++, even Algol-68. None are 'compilers'
>>>>>   per-se, but to-'C' TRANSLATORS. So, 'C',
>>>>>   pretty much All Are One And One Is All.
>>>>
>>>> No.  Compiler as first stage translate given language to a
>>>> common representation.  This representatiton is different
>>>> than C.  Ada and GNU Pascal have parametrized types, there
>>>> is nothing like that in C.
>>>>
>>>> <interjection>
>>>>
>>>> C++ (and some other languages)
>>>> have exceptions, C do not have them.
>>>
>>>What about setjmp()/longjmp() ?
>>
>>Not at all the same thing.  `setjmp`/`longjmp` are about
>>non-local flows of control; exceptions are about non-local
>>passing of values.
>
>However, in many real world situations, [sig]setjump and
>[sig]longjmp can be used to emulate exceptions.

Yes, I said just that.  :-)

>I have a C++ application that models a computer (Burroughs V380
>et alia).   The thread that models each processor (cpu) uses
>longjmp whenever a condition is encountered that would have
>been signaled as a fault on the real cpu.    The processor code
>doesn't do dynamic memory allocation;  and the fault code is
>stored in the processor class before the longjmp call.
>
>I once tried replacing setjmp/longjmp with C++ exceptions which
>led to a 20% reduction in simulated CPU performance (as measured
>by the time to compile a COBOL program).

Huh.  Interesting.  I wonder why...possibly to run a bunch of
nop destructors?

	- Dan C.