PARALLEL SECTIONS (TU*X only)

OpenMP Parallel Compiler Directive: Provides an abbreviated way to specify a parallel region containing a single SECTIONS directive. The semantics are identical to explicitly specifying a PARALLEL directive immediately followed by a SECTIONS directive.

Syntax

c$OMP PARALLEL SECTIONS [clause[[,] clause] ...]
[c$OMP SECTION]
     block
[c$OMP SECTION
     block] ...
c$OMP END PARALLEL SECTIONS

c
Is one of the following: C (or c), !, or * (see Syntax Rules for Parallel Directives).

clause
Can be any of the clauses accepted by the PARALLEL or SECTIONS directives.

block
Is a structured block (section) of statements or constructs. You cannot branch into or out of the block.

The last section ends at the END PARALLEL SECTIONS directive.

See Also: Parallel Directives for Tru64 UNIX Systems, OpenMP Fortran API Compiler Directives (TU*X only), Compaq Fortran Parallel Compiler Directives (TU*X only)

Examples

In the following example, subroutines XAXIS, YAXIS, and ZAXIS can be executed concurrently:

  c$OMP PARALLEL SECTIONS
  c$OMP SECTION
        CALL XAXIS
  c$OMP SECTION
        CALL YAXIS
  c$OMP SECTION
        CALL ZAXIS
  c$OMP END PARALLEL SECTIONS