By Joachim Beer
This monograph offers a unique execution version for the parallel execution of ordinary sequential Prolog. during this execution version Prolog technique calls may be successfully pipelined, and the writer exhibits how even absolutely deterministic Prolog courses will be successfully mapped onto the proposed structure. The layout is predicated on a hugely optimized summary Prolog particular guide set. a unique characteristic of this paintings is a worldly class scheme for Prolog variables which considerably reduces the overhead for unification with occur-check. To aid the version an structure which includes a round pipeline of self sustaining processors has been designed. This pipeline has been designed to paintings as a co-processor to a UNIX established pc. not like different makes an attempt to execute sequential Prolog in parallel, the proposed version doesn't limit using any of the traditional Prolog language positive factors. The booklet supplies a whole account of the execution version, the method structure, and the summary Prolog guideline set.
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Additional resources for Concepts, Design, and Performance Analysis of a Parallel Prolog Machine
If this value is used as the argument of h(Y), the variable X might become bound again, disregarding any bindings established by the goal s(Y,U). However, in order to solve this problem the tag 'NEW_UNBOUND' need only be changed to 'REF'. A special instruction, 'put_value', just changes all 'NEW_UNBOUND' or 'UNBOUND' tags to 'REF'. In the above case the argument of h(Y) will now be a reference to location X. Since variable Y was used before in goal s(Y,U) it is guaranteed that the location of variable X wilt contain a proper value.
However, as soon as the processor working on clause C2 has possession of this argument, it will proceed with unifying the argument with the respective formal parameter of the clause 35 C2 (in this case binding variable X via the binding Z ~ X with the constant 'b'). Concurrently the left processor proceeds with unifying the remaining arguments of clause C1. Unfortunately, this process would result in assigning the constant 'a' to variable X. Due to this race condition in establishing the binding for variable X, correct program behavior cannot be guaranteed.
For the above example this means that within the structure f(Y) the variable Y remains in an undefined state when the structure is created. When t(Y) is invoked, the argument register is loaded with a pointer to the undefined cell within the structure f( ) and the tag 'NEW_UNBOUND'. Now we can proceed as described in the other examples above. Whenever we return from the subtree spanned by t(Y), the undefined stot within the structure f 0 wit1 have been put in a well defined state. This whole scheme is implemented by providing another 'mode' flag.