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Some Implementation Issues

• Functionality implemented via a linda blackboard
• Goals and (all) solutions through blackboard
• Resulting scheduling similar to &-Prolog
• Shared variables implemented by attributed variables + blackboard:
  • variables involved in a parallel call are marked as a ``communication'' variable (i.e., shared)
  • done by attaching an attribute
  • communication variables are given unique identifiers
  • ``shared'' character is inherited during unification
  • standard tells done in place, tells to communication variables posted on the blackboard
  • asks do a blocking rd (read) on the blackboard
• All implementation done at source (Prolog) level
  (see ICLP'95 paper)
• Blackboard-based systems and shared variable communication-based systems - ``different camps:'' they can be easily unified using this technique!