3.2 Parallelizing for OpenMP

The C compiler accepts the OpenMP API for shared memory parallelization natively. The API consists of a set of parallelization pragmas. Information on the OpenMP API specification is at the OpenMP web site, http://www.openmp.org/.

To enable the compiler’s OpenMP support and recognition of the OpenMP pragmas, compile with the -xopenmp option. Without -xopenmp, the compiler treats the OpenMP pragmas as comments. See B.2.123 -xopenmp[=i].

See the Solaris Studio OpenMP API User’s Guide for details.

3.2.1 Handling OpenMP Runtime Warnings

The OpenMP runtime system can issue warnings for non-fatal errors. Use the following function to register a call back function to handle these warnings:

int sunw_mp_register_warn(void (*func) (void *) )

You can access the prototype for this function by issuing a #include preprocessor directive for <sunw_mp_misc.h>.

If you do not want to register a function, set the environment variable SUNW_MP_WARN to TRUE and the warning messages are sent to stderr. For more information on SUNW_MP_WARN, see 3.3.3 SUNW_MP_WARN.

For information specific to this implementation of OpenMP, see the Solaris Studio OpenMP API User’s Guide.