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On Fri, May 11, 2012 at 7:20 AM, Jay Carlson <> wrote:
> Let me underline that. Unless you know otherwise, any function invocation can pause; if you have made any assumptions about the state of the world, you need to re-establish those invariants after each call because it may have been a long time since the start of the call.

And this may be a harmless-looking sleep() call ... the problem is
what we might call the 'imperative illusion', which is the delusion
that a piece of code is totally in control of its data.

Fabien's idea is promising here - don't rely on shared memory for big tasks.

Actually, Lanes does some things correctly - the states only share
initial state (the upvalues are copied across) and they then do
everything explicitly via messaging.  Go has an interesting hybrid;
memory is shared between goroutines, but people are encouraged to use
channels to send data.  (Such green threads use OS threads when
anything blocking happens)

steve d.