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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