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From: Peter Dimov (pdimov_at_[hidden])
Date: 2004-09-21 07:33:40

Ben Hutchings wrote:
> Note also that the compiler could also hoist the test of the control
> variable out of the loop if it can tell that nothing in that loop
> will modify the control variable. This seems to me to be a more
> likely problem.
> It is possible that "volatile" may help you to ensure visibility, but
> the semantics of volatile are implementation-dependent and not well
> specified.

Arguably, volatile is quite rigidly specified. In particular, a compiler is
not allowed to hoist a test of a volatile variable out of a loop because
this alters the observable behavior, by definition.

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