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From: ttwang@polyslo.CalPoly.EDU (Sir Hoyt)
Newsgroups: comp.lang.c
Subject: setjmp/longjmp question
Message-ID: <8514@polyslo.CalPoly.EDU>
Date: 24 Feb 89 18:20:53 GMT
Reply-To: ttwang@polyslo.CalPoly.EDU (Thomas Wang)
Distribution: na
Organization: Cal Poly State University -- San Luis Obispo
Lines: 25

I am considering using setjmp/longjmp to implement exception handling in C.
It would be used like this:

int foo()
{
 /* variable allocation here */
 if (setjmp( ... ))
 { /* clean up the variables */ }
 else
 { /* normal codes */ }
}

Normal codes would including calling other subroutines.  When error occurs,
longjmp() will be used to jump back to foo().

I am aware that on the Sun, all register variables cannot be trusted after a
longjmp().

What I want to know is the behavior of setjmp/longjmp on other machines.
Would longjmp() clober all local variables if assuming RISC machine, and
automatic register allocation?

 -Thomas Wang ("I am, therefore I am."
                 - Akira               )
                                                     ttwang@polyslo.calpoly.edu