Persistent Immutable Shared Abstractions

A write-once, read-many persistent store has been developed for Concurrent Scheme, a distributed-memory parallel Lisp for the Mayyy multicomputer. The prototype implementation 2 supports the explicit store and implicit retrieval of instances of the Scheme data types. Items are stored into per node repositories, using a modiied form of the original Concurrent Scheme \message" format. Potential access concur-rency and transaction atomicity of the store are discussed. The eecacy of the prototype is demonstrated via its utilization within a parallel ray tracer, on a network implementation of Concurrent Scheme.