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C******************************************************************************
C FILE: omp_orphan.f
C DESCRIPTION:
C OpenMP Example - Parallel region with an orphaned directive - Fortran
C Version
C This example demonstrates a dot product being performed by an orphaned
C loop reduction construct. Scoping of the reduction variable is critical.
C AUTHOR: Blaise Barney 5/99
C LAST REVISED:
C******************************************************************************
PROGRAM ORPHAN
COMMON /DOTDATA/ A, B, SUM
INTEGER I, VECLEN
PARAMETER (VECLEN = 100)
REAL*8 A(VECLEN), B(VECLEN), SUM
DO I=1, VECLEN
A(I) = 1.0 * I
B(I) = A(I)
ENDDO
SUM = 0.0
!$OMP PARALLEL
CALL DOTPROD
!$OMP END PARALLEL
WRITE(*,*) "Sum = ", SUM
END
SUBROUTINE DOTPROD
COMMON /DOTDATA/ A, B, SUM
INTEGER I, TID, OMP_GET_THREAD_NUM, VECLEN
PARAMETER (VECLEN = 100)
REAL*8 A(VECLEN), B(VECLEN), SUM
TID = OMP_GET_THREAD_NUM()
!$OMP DO REDUCTION(+:SUM)
DO I=1, VECLEN
SUM = SUM + (A(I)*B(I))
PRINT *, ' TID= ',TID,'I= ',I
ENDDO
RETURN
END
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