15.2.3.11 PARALLEL SECTIONS Directive (TU*X only)

The PARALLEL SECTIONS 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.

The PARALLEL SECTIONS directive takes the following form:

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 Section 15.2.1).

clause
Can be any of the clauses accepted by the PARALLEL or SECTIONS directives. See Sections 15.2.3.9 and 15.2.3.12.

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.

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