%T A general\-purpose parallel programming environment
%A Mark Debbage, Mark Hill, Denis A. Nicole
%E Janet Edwards
%B Proceedings of WoTUG\-14: Occam and the Transputer\-Current Developments
%X A parallel programming environment has been developed which
is superior to many available systems on current generation
transputers. The core of the package is a packet router
which delivers asynchronous datagrams around arbitrary
networks. The router is guaranteed not to deadlock provided
that higher levels do not violate the eager\-readership
edict. This eager0readership can be guaranteed by the use of
communication protocols which ensure that packets are never
sent to a destination which has insufficient buffer space
available. The router has been implemented in C and is
applicable to a wide number of loosely coupled
multiprocessing architectures. The current implementation
has been optimised for transputer networks, on which it
achieves impressive communications performance. The
implementation of a virtual channel protocol within occam
semantics on such a router is discussed. This forms the
basis of version 2.0 of the popular Virtual Channel Router
(VCR) package. The user interface to these channels is the
conventional occam syntax for communications but with the
configuration restriction of four channel\-pairs per
processor eliminated. The virtual channels provided by this
package can be exploited from other languages through the
appropriate Inmos Toolset.
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