PGI Fortran Reference manual - The Portland Group

OpenMP Directives for FortranLASTPRIVATE(list)UsageThe PARALLEL SECTIONS / END SECTIONS directive pair define a non-iterative worksharingconstruct without the need to define an enclosing parallel region. Each section is executedby a single processor. If there are more processors than sections, some processors will have nowork and will jump to the implied barrier at the end of the construct. If there are more sectionsthan processors, one or more processors will execute more than one section.A SECTION directive may only appear within the lexical extent of the enclosing PARALLELSECTIONS / END SECTIONS directives. In addition, the code within the PARALLELSECTIONS / END SECTIONS directives must be a structured block, and the code in eachSECTION must be a structured block.Semantics are identical to a parallel region containing only an omp sections pragma andthe associated structured block. The available clauses are as defined in PARALLEL...ENDPARALLEL and DO...END DO.8.7.12. PARALLEL WORKSHAREThe OpenMP PARALLEL WORKSHARE directive provides a short form method of including aWORKSHARE directive inside a PARALLEL construct.Syntax!$OMP PARALLEL WORKSHARE [CLAUSES]< Fortran structured block to be executed in parallel >[!$OMP END PARALLEL WORKSHARE]!$OMP PARALLEL DO [CLAUSES]< Fortran DO loop to be executed in parallel >[!$OMP END PARALLEL DO]ClausesPRIVATE(list)SHARED(list)DEFAULT(PRIVATE | SHARED | NONE)FIRSTPRIVATE(list)LASTPRIVATE(list)REDUCTION([{operator | intrinsic}:] list)COPYIN(list)IF(scalar_logical_expression)NUM_THREADS(scalar_integer_expression)SCHEDULE (type [, chunk])COLLAPSE (n)ORDEREDUsageThe OpenMP PARALLEL WORKSHARE directive provides a short form method of includinga WORKSHARE directive inside a PARALLEL construct. The semantics of the PARALLELPGI Fortran Reference Guide 174