## 15.2 Parallel Directives for Tru64 UNIX Systems

Compaq Fortran provides two sets of directives that support shared memory parallel programming. These directives provide ways to specify the actions taken by the compiler and run-time system when executing a Fortran program in parallel.

This section describes syntax rules and the following sets of directives:

- OpenMP Fortran compiler directives (Section 15.2.3)

  These directives comply with OpenMP Fortran Application Program Interface (API) specification Version 1.0.

- Compaq Fortran parallel compiler directives (Section 15.2.4)

  These directives are provided for compatibility with older programs that were written for parallel execution.

Each set has a specific prefix that identifies the directives in the set. You can only use one set of directives within the same program.

For information on how to use these directives, see your user manual.

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