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Resources encapsulate processes and the variables they share, and can be separately compiled. Operations provide the primary mechanism for process interaction.
SR provides a novel integration of the mechanisms for invoking and servicing operations. Consequently, it supports local and remote procedure call, rendezvous, message passing , dynamic process creation, multicast, semaphores and shared memory.
Version 2.2 has been ported to Sun-3, Sun-4, Decstation, SGI Iris, HP PA, HP 9000/300, NeXT, Sequent Symmetry, DG AViiON, RS/6000, Multimax, Apollo and others.
This article was originally based on material from the Free On-line Dictionary of Computing, which is used under the GFDL.