Article View: comp.std.c
Article #1099A volatile question
From: David Keppel
Date: Mon, 19 Mar 1990 01:56
Date: Mon, 19 Mar 1990 01:56
21 lines
1047 bytes
1047 bytes
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
--
pardo@cs.washington.edu
{rutgers,cornell,ucsd,ubc-cs,tektronix}!uw-beaver!june!pardo
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!snorkelwacker!mit-eddie!uw-beaver!uw-june!pardoShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!snorkelwacker!mit-eddie!uw-beaver!uw-june!pardo 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