Intel Fortran Language Reference - NCI National Facility

14 Intel Fortran Language Reference
• FIRSTPRIVATE (list)
See “FIRSTPRIVATE Clause”.
• LASTPRIVATE (list)
See “LASTPRIVATE Clause”.
• PRIVATE (list)
See “PRIVATE Clause”.
• REDUCTION ( operator | intrinsic : list )
See “REDUCTION Clause”.
block
Is a structured block (section) of statements or constructs. Any constituent section must also be a
structured block.
You cannot branch into or out of the block.
Rules and Behavior
Each section of code is preceded by a SECTION directive, although the directive is optional for
the first section. The SECTION directives must appear within the lexical extent of the SECTIONS
and END SECTIONS directive pair.
The last section ends at the END SECTIONS directive. Threads that complete execution of their
SECTIONs encounter an implied barrier at the END SECTIONS directive unless NOWAIT is
specified.
SECTIONS directives must be encountered by all threads in a team or by none at all. It must also
be encountered in the same order by all threads in a team.
Example
In the following example, subroutines XAXIS, YAXIS, and ZAXIS can be executed concurrently:
c$OMP PARALLEL
c$OMP SECTIONS
c$OMP SECTION
CALL XAXIS
c$OMP SECTION
CALL YAXIS
c$OMP SECTION
CALL ZAXIS
c$OMP END SECTIONS
c$OMP END PARALLEL
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