! This file created from f77/coll/nonblocking_inpf.f with f77tof90

! -*- Mode: Fortran; -*- 

!

! (C) 2012 by Argonne National Laboratory.

!     See COPYRIGHT in top-level directory.

!

! A simple test for Fortran support of the MPI_IN_PLACE value in Alltoall[vw].

!

       program main

       use mpi

       integer SIZEOFINT

       integer MAX_SIZE

       parameter (MAX_SIZE=1024)

       integer rbuf(MAX_SIZE)

       integer rdispls(MAX_SIZE), rcounts(MAX_SIZE), rtypes(MAX_SIZE)

       integer comm, rank, size, req

       integer sumval, ierr, errs

       integer iexpected, igot

       integer i, j

       errs = 0

       call mtest_init( ierr )

       comm = MPI_COMM_WORLD

       call mpi_comm_rank( comm, rank, ierr )

       call mpi_comm_size( comm, size, ierr )

       call mpi_type_size( MPI_INTEGER, SIZEOFINT, ierr )

       do i=1,MAX_SIZE

           rbuf(i) = -1

       enddo

       do i=1,size

          rbuf(i) = (i-1) * size + rank

       enddo

       call mpi_ialltoall( MPI_IN_PLACE, -1, MPI_DATATYPE_NULL, &

      &                      rbuf, 1, MPI_INTEGER, comm, req, ierr )

       call mpi_wait( req, MPI_STATUS_IGNORE, ierr )

       do i=1,size

          if (rbuf(i) .ne. (rank*size + i - 1)) then

             errs = errs + 1

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

      &             rbuf(i), ', should be', rank * size + i - 1

          endif

       enddo

       do i=1,MAX_SIZE

           rbuf(i) = -1

       enddo

       do i=1,size

           rcounts(i) = i-1 + rank

           rdispls(i) = (i-1) * (2*size)

           do j=0,rcounts(i)-1

               rbuf(rdispls(i)+j+1) = 100 * rank + 10 * (i-1) + j

           enddo

       enddo

       call mpi_ialltoallv( MPI_IN_PLACE, 0, 0, MPI_DATATYPE_NULL, &

      &                       rbuf, rcounts, rdispls, MPI_INTEGER, &

      &                       comm, req, ierr )

       call mpi_wait( req, MPI_STATUS_IGNORE, ierr )

       do i=1,size

           do j=0,rcounts(i)-1

               iexpected = 100 * (i-1) + 10 * rank + j

               igot      = rbuf(rdispls(i)+j+1)

               if ( igot .ne. iexpected ) then

                   errs = errs + 1

                   print *, '[', rank, ']: IALLTOALLV got ', igot, &

      &                   ',but expected ', iexpected, &

      &                   ' for block=', i-1, ' element=', j

               endif

           enddo

       enddo

       do i=1,MAX_SIZE

           rbuf(i) = -1

       enddo

       do i=1,size

           rcounts(i) = i-1 + rank

           rdispls(i) = (i-1) * (2*size) * SIZEOFINT

           rtypes(i)  = MPI_INTEGER

           do j=0,rcounts(i)-1

               rbuf(rdispls(i)/SIZEOFINT+j+1) = 100 * rank &

      &                                        + 10 * (i-1) + j

           enddo

       enddo

       call mpi_ialltoallw( MPI_IN_PLACE, 0, 0, MPI_DATATYPE_NULL, &

      &                       rbuf, rcounts, rdispls, rtypes, &

      &                       comm, req, ierr )

       call mpi_wait( req, MPI_STATUS_IGNORE, ierr )

       do i=1,size

           do j=0,rcounts(i)-1

               iexpected = 100 * (i-1) + 10 * rank + j

               igot      = rbuf(rdispls(i)/SIZEOFINT+j+1)

               if ( igot .ne. iexpected ) then

                   errs = errs + 1

                   print *, '[', rank, ']: IALLTOALLW got ', igot, &

      &                   ',but expected ', iexpected, &

      &                   ' for block=', i-1, ' element=', j

               endif

           enddo

       enddo

       do i=1,MAX_SIZE

           rbuf(i) = -1

       enddo

       do i = 1, size

           rbuf(i) = rank + (i-1)

       enddo

       call mpi_ireduce_scatter_block( MPI_IN_PLACE, rbuf, 1, &

      &                                  MPI_INTEGER, MPI_SUM, comm, &

      &                                  req, ierr )

       call mpi_wait( req, MPI_STATUS_IGNORE, ierr )

       sumval = size * rank + ((size-1) * size)/2

       if ( rbuf(1) .ne. sumval ) then

           errs = errs + 1

           print *, 'Ireduce_scatter_block does not get expected value.'

           print *, '[', rank, ']:', 'Got ', rbuf(1), ' but expected ', &

      &              sumval, '.'

       endif

       call mtest_finalize( errs )

       end