But broadcasting is a form of message-passing too!
That wasn't my point. My point was that there is no return channel.
If you want to know when your write is done, you have to use a lock
or a memory barrier. Both are very expensive.
As I said, it's a matter of abstraction level. My point is:
you can model both abstraction levels with message passing.
Moreover, using shared memory doesn't magically make these
synchronisation issues go away. They remain.
Martin
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