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Extrinsic Procedures

Because HPF is designed as a high-level, machine-independent language, there are certain operations that are difficult or impossible to express directly. For example, many applications benefit from finely-tuned systolic communications on certain machines; HPF's global address space does not express this well. Extrinsic procedures define an explicit interface to procedures written in other paradigms, such as explicit message-passing subroutine libraries. Section describes this interface. Annex gives a specific interface for HPF_LOCAL routines, for HPF_SERIAL routines, and for Fortran 90.