[Info-vax] LLVM, volatile and async VMS I/O and system calls

[Lawrence D’Oliveiro]

On Monday, October 4, 2021 at 7:20:00 AM UTC+13, Dave Froble wrote:
> As an example, back in the day, the RSTS Basic+ interpreter had an 
> interesting quirk. For example: 
> 
> A = "abc" 
> B = A 
> 
> One would expect the value in A to be placed in the location where the 
> pointer to B points. However, Basic+ would change the pointer to B to 
> the value of the pointer to A, thus losing the old location of B. I 
> think this happened with strings, don't really remember, it has been a 
> very long time. 
> 
> Now consider that the pointer to B was in an I/O buffer. After the 
> operation, B would no longer be pointing into the I/O buffer. Perhaps 
> not such a good thing. (Actually a horrible thing!) 

Isn’t that what LSET and RSET were for?