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From: pardo@cs.washington.edu (David Keppel)
Newsgroups: comp.std.c
Subject: A volatile question
Message-ID: <11143@june.cs.washington.edu>
Date: 19 Mar 90 01:56:54 GMT
Reply-To: pardo@june.cs.washington.edu (David Keppel)
Organization: University of Washington, Computer Science, Seattle
Lines: 21

I have a question about the meaning of ``volatile''.  Suppose:

	foo (volatile int *zork) { ... }

	bar()
	{
	    int zork;
	    foo (&zork);
	    ...
	}

The behavior that I want is that `zork' can be cached (e.g., in a
register) in `bar', but that it must be treated as `volatile' in
`foo'.  If the optimizer is allowed to to optimize away the
`volatileness' of zork inside `foo'?  If it is, what is the correct
way to code this function?

	;-D on  ( A constant question about volatile )  Pardo
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