Not in the shared memory way I mean (which I did not make clear), per <a href="http:&#x2F;&#x2F;docs.racket-lang.org&#x2F;guide&#x2F;parallelism.html" rel="nofollow">http:&#x2F;&#x2F;docs.racket-lang.org&#x2F;guide&#x2F;parallelism.html</a><p><i>The racket&#x2F;place library provides support for performance improvement through parallelism with the place form. The place form creates a place, which is effectively a new Racket instance that can run in parallel to other places, including the initial place. The full power of the Racket language is available at each place, but places can communicate only through message passing—using the place-channel-put and place-channel-get functions on a limited set of values—which helps ensure the safety and independence of parallel computations.</i><p>Compare to current Guile, where the documentation says sharing a hash table without using a mutex will not corrupt memory, but probably won&#x27;t give you the results you desire.