unions and volatile qualifiers

[00704a-Liber]

In article <6891 at j.cc.purdue.edu> ksb at j.cc.purdue.edu.UUCP (Kevin Braunsdorf) writes:
|All the members of this union should be tagged as being volatile.
|
|	union {
|		int oi;
|		char oc;
|	} u;
|	int *pi;
|
|	pi = & u.oi;			/* should be a comment || warning */

|You see why they cannot be ordinary in the union?

No.  What volatile means is that something besides this program can modify
this variable (such as a hardware interrupt, signal handler, etc.).
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