Newsgroups: comp.lang.c
Path: utzoo!henry
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: volatile keyword - what does it mean?
Message-ID: <1991Jun19.045119.25918@zoo.toronto.edu>
Date: Wed, 19 Jun 1991 04:51:19 GMT
References: <1991Jun19.003124.28290@viewlogic.com>
Organization: U of Toronto Zoology

In article <1991Jun19.003124.28290@viewlogic.com> kenc@suntan.viewlogic.com (Kenstir) writes:
>I have a (char *) variable that I'm trying to protect
>across a longjmp...
>...
>    volatile int i;
>    volatile char *mbuf;

There is no fundamental difference between these declarations.  The first
takes the type "volatile int", applies no further type constructions to
it, and gives you a variable of that type.  The second takes the type
"volatile char", constructs a pointer to it, and gives you a variable
of that type.

To get a volatile pointer to char, say `char * volatile mbuf;'.  (Ugh.)

"Volatile" is part of the type; it's not like a storage class.
-- 
"We're thinking about upgrading from    | Henry Spencer @ U of Toronto Zoology
SunOS 4.1.1 to SunOS 3.5."              |  henry@zoo.toronto.edu  utzoo!henry