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clarify in docs that threads provide sequential consistency

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Matthew Flatt 2015-05-16 15:18:50 -06:00
parent 32a2ca6eff
commit 12308e3f17
1 changed files with 3 additions and 1 deletions
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pkgs/racket-doc/scribblings/reference/eval-model.scrbl
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@ -904,7 +904,9 @@ Threads are created explicitly by functions such as @racket[thread].
In terms of the evaluation model, each step in evaluation actually consists of multiple concurrent
expressions, up to one per thread, rather than a single expression. The expressions all
share the same objects and top-level variables, so that they can
communicate through shared state. Most evaluation steps involve a
communicate through shared state, and sequential consistency is
guaranteed (i.e., the result is consistent with some global sequence
imposed on all evaluation steps across threads). Most evaluation steps involve a
single step in a single expression, but certain synchronization
primitives require multiple threads to progress together in one step.