! This file created from test/mpi/f77/attr/commattr3f.f with f77tof90

! -*- Mode: Fortran; -*- 

!

!  (C) 2004 by Argonne National Laboratory.

!      See COPYRIGHT in top-level directory.

!

!  This tests the null copy function (returns flag false; thus the

!  attribute should not be propagated to a dup'ed communicator

!  This is must like the test in commattr2f

!

      program main

      use mpi

      integer errs, ierr

      integer (kind=MPI_ADDRESS_KIND) extrastate, valin, valout, val

      integer comm1, comm2

      integer keyval

      logical flag

!

! The only difference between the MPI-2 and MPI-1 attribute caching

! routines in Fortran is that the take an address-sized integer

! instead of a simple integer.  These still are not pointers,

! so the values are still just integers. 

!

      errs      = 0

      call mtest_init( ierr )

      call mpi_comm_dup( MPI_COMM_WORLD, comm1, ierr )

! 

      extrastate = 1001

      call mpi_comm_create_keyval( MPI_COMM_NULL_COPY_FN,  &

      &                             MPI_COMM_NULL_DELETE_FN, keyval,  &

      &                             extrastate, ierr )

      flag = .true.

      call mpi_comm_get_attr( comm1, keyval, valout, flag, ierr )

      if (flag) then

         errs = errs + 1

         print *, ' get attr returned true when no attr set'

      endif

! Test the null copy function

      valin = 5001

      call mpi_comm_set_attr( comm1, keyval, valin, ierr )

      call mpi_comm_dup( comm1, comm2, ierr )

! Because we set NULL_COPY_FN, the attribute should not 

! appear on the dup'ed communicator

      flag = .false.

      call mpi_comm_get_attr( comm1, keyval, valout, flag, ierr )

      if (valout .ne. 5001) then

         errs = errs + 1

         print *, 'Unexpected output value in comm ', valout

      endif

      flag = .true.

      call mpi_comm_get_attr( comm2, keyval, valout, flag, ierr )

      if (flag) then

         errs = errs + 1

         print *, ' Attribute incorrectly present on dup communicator'

      endif

! Test the delete function      

      call mpi_comm_free( comm2, ierr )

!

! Test the attr delete function

      call mpi_comm_dup( comm1, comm2, ierr )

      valin      = 6001

      extrastate = 1001

      call mpi_comm_set_attr( comm2, keyval, valin, ierr )

      call mpi_comm_delete_attr( comm2, keyval, ierr )

      flag = .true.

      call mpi_comm_get_attr( comm2, keyval, valout, flag, ierr )

      if (flag) then

         errs = errs + 1

         print *, ' Delete_attr did not delete attribute'

      endif

      call mpi_comm_free( comm2, ierr )

!

      ierr = -1

      call mpi_comm_free_keyval( keyval, ierr )

      if (ierr .ne. MPI_SUCCESS) then

         errs = errs + 1

         call mtestprinterror( ierr )

      endif

      call mpi_comm_free( comm1, ierr )

      call mtest_finalize( errs )

      call mpi_finalize( ierr )

      end