this question is referring to a thread here:
http://developers.slashdot.org/article.pl?sid=07/10/03/0021253&from=rss
but I'll bet that those three classifications (no shared state, shared
state with explicit locking, shared state without explicit locks)
I think there's one big distinction: shared or not shared. I figured
the author was talking about functional/dataflow languages which don't
have shared state (including MPI, in a sense) versus languages which
assume shared memory such as OpenMP.
within the shared-memory approach, explicit locking is pretty clear.
I presume "without explicit locks" just means crude systems like Java's
monitored data types.
IMO, the penitude of parallel packages mainly shows that we don't have
good answers yet...
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