! This file created from test/mpi/f77/coll/inplacef.f with f77tof90

! -*- Mode: Fortran; -*-

!

! (C) 2005 by Argonne National Laboratory.

!     See COPYRIGHT in top-level directory.

!

! This is a simple test that Fortran support the MPI_IN_PLACE value

!

       program main

       use mpi_f08

       integer ierr, errs

       integer root

       TYPE(MPI_Comm) comm

       integer rank, size

       integer i

       integer MAX_SIZE

       parameter (MAX_SIZE=1024)

       integer rbuf(MAX_SIZE), rdispls(MAX_SIZE), rcount(MAX_SIZE), &

      &      sbuf(MAX_SIZE)

       errs = 0

       call mtest_init( ierr )

       comm = MPI_COMM_WORLD

       call mpi_comm_rank( comm, rank, ierr )

       call mpi_comm_size( comm, size, ierr )

       root = 0

! Gather with inplace

       do i=1,size

          rbuf(i) = - i

       enddo

       rbuf(1+root) = root

       if (rank .eq. root) then

          call mpi_gather( MPI_IN_PLACE, 1, MPI_INTEGER, rbuf, 1, &

      &         MPI_INTEGER, root, comm, ierr )

          do i=1,size

             if (rbuf(i) .ne. i-1) then

                errs = errs + 1

                print *, '[',rank,'] rbuf(', i, ') = ', rbuf(i),  &

      &                   ' in gather'

             endif

          enddo

       else

          call mpi_gather( rank, 1, MPI_INTEGER, rbuf, 1, MPI_INTEGER, &

      &         root, comm, ierr )

       endif

! Gatherv with inplace

       do i=1,size

          rbuf(i) = - i

          rcount(i) = 1

          rdispls(i) = i-1

       enddo

       rbuf(1+root) = root

       if (rank .eq. root) then

          call mpi_gatherv( MPI_IN_PLACE, 1, MPI_INTEGER, rbuf, rcount, &

      &         rdispls, MPI_INTEGER, root, comm, ierr )

          do i=1,size

             if (rbuf(i) .ne. i-1) then

                errs = errs + 1

                print *, '[', rank, '] rbuf(', i, ') = ', rbuf(i),  &

      &                ' in gatherv'

             endif

          enddo

       else

          call mpi_gatherv( rank, 1, MPI_INTEGER, rbuf, rcount, rdispls, &

      &         MPI_INTEGER, root, comm, ierr )

       endif

! Scatter with inplace

       do i=1,size

          sbuf(i) = i

       enddo

       rbuf(1) = -1

       if (rank .eq. root) then

          call mpi_scatter( sbuf, 1, MPI_INTEGER, MPI_IN_PLACE, 1, &

      &         MPI_INTEGER, root, comm, ierr )

       else

          call mpi_scatter( sbuf, 1, MPI_INTEGER, rbuf, 1, &

      &         MPI_INTEGER, root, comm, ierr )

          if (rbuf(1) .ne. rank+1) then

             errs = errs + 1

             print *, '[', rank, '] rbuf  = ', rbuf(1), &

      &            ' in scatter'

          endif

       endif

       call mtest_finalize( errs )

       end