Re: Volatile happens before question
On 1/18/2012 4:12 PM, markspace wrote:
On 1/18/2012 3:00 PM, Knute Johnson wrote:
On 1/18/2012 1:16 PM, markspace wrote:
That's what I was thinking. With folks like Brian Goetz and Bartosz
saying the system can simply invent values, it's hard to analyze the
resulting code for any kind of deterministic behavior. Esp. because Java
is a step away from the machine, and I don't know exactly what sort of
operations are going to be executed.
I know that the JLS says that variables can have values out of thin air
but Goetz says on page 36 "When a thread reads a variable without
synchronization, it may see a stale value, but at least it sees a value
that was actually placed there by some thread rather then some random
value. This safety guarantee is called out-of-thin-air safety."
That's a good find. I can't reconcile that statement with other things
I'm seeing. Since real world hardware seems to be able to produce values
out of thin air, I don't see how Java could prevent this. It seems that
one or the other statement is incorrect.
I'm curious about the "values out of thin air" statement about hardware.
Could you give some information about how it happens?
Patricia
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