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WITHOUT-INTERRUPTS: my last message
Date: Wed, 23 Oct 85 16:04:59 EDT
I too promise that this is my last message.
Mr. Moon is right -- VMS certainly couldn't promise to lock out
other processes that might touch a shared section.
Sure it could... if it wanted to. Alternatively, the LISP could
simply refuse to share.
On the third hand, suppose I want to swap the names of two files,
so I do
(rename-file "foo" "temp")
(rename-file "bar" "foo")
(rename-file "temp" "bar"))
Assuming that files foo and bar both existed to begin with, am I guaranteed
that at no time can any other process get the value NIL for
(and (probe-file "foo") (probe-file "bar"))
? That would be an awfully nice property to have.