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By V. Sankrithi Krishnan

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In contrast, rep has uni-directional message passing only and no distributed backtracking. This is less powerful but much simpler to implement. We believe that two-way unification and distributed backtracking may be simulated explicitly using message passing in rep on the occasions when it is needed. Delta Prolog's choice goals can be viewed as a form of committed-choice non-determinism restricted to having event goals only in the guard. The Parlog thread in rep is more general and does not suffer from this restriction.

Mem()). In this case, when a request for expansion is made, then some planning is performed to choose the best block of memory from its own pool to perform the minimal amount of work in the stack shifter. This may, for example, result in a local shift instead of a global one. Planning, as well as choices of block size and layout have ensured that the stack shifting continues to be very fast. 3 Maintaining fast overflow checking by pointer comparison requires that both pointers be in the same block.

21. W. R. Stevens. UNIX Network Programming. Prentice Hall Software Series. PrenticeHall, New Jersey, 1990. 22. J. Thorn and J. Zobel. 0. Technical Report 86/10, Dept. of Computer Science, University of Melbourne, 1986. 23. D. H. D. Warren. An Abstract Prolog Instruction Set. Technical Note 309, Artificial Intelligence Center, SRI International, October 1983. 24. M. J. Wise, D. G. Jones, and T. Hintz. PMS-Prolog: a Distributed, Coarse-grainparallel Prolog with Processes, Modules and Streams. In P.

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