! -*- Mode: Fortran; -*-

!

!  (C) 2014 by Argonne National Laboratory.

!      See COPYRIGHT in top-level directory.

!

       program main

       use mpi_f08

       integer ierr, provided, errs, rank, size

       integer iv, isubv, qprovided

       logical flag

       errs = 0

       flag = .true.

       call mpi_finalized( flag, ierr )

       if (flag) then

          errs = errs + 1

          print *, 'Returned true for finalized before init'

       endif

       flag = .true.

       call mpi_initialized( flag, ierr )

       if (flag) then

          errs = errs + 1

          print *, 'Return true for initialized before init'

       endif

       provided = -1

       call mpi_init_thread( MPI_THREAD_MULTIPLE, provided, ierr )

       if (provided .ne. MPI_THREAD_MULTIPLE .and.  &

      &     provided .ne. MPI_THREAD_SERIALIZED .and. &

      &     provided .ne. MPI_THREAD_FUNNELED .and. &

      &     provided .ne. MPI_THREAD_SINGLE) then

          errs = errs + 1

          print *, ' Unrecognized value for provided = ', provided

       endif

       iv    = -1

       isubv = -1

       call mpi_get_version( iv, isubv, ierr )

       if (iv .ne. MPI_VERSION .or. isubv .ne. MPI_SUBVERSION) then

          errs = errs + 1

          print *, 'Version in mpif.h and get_version do not agree'

          print *, 'Version in mpif.h is ', MPI_VERSION, '.',  &

      &              MPI_SUBVERSION

          print *, 'Version in get_version is ', iv, '.', isubv

       endif

       if (iv .lt. 1 .or. iv .gt. 3) then

          errs = errs + 1

          print *, 'Version of MPI is invalid (=', iv, ')'

       endif

       if (isubv.lt.0 .or. isubv.gt.2) then

          errs = errs + 1

          print *, 'Subversion of MPI is invalid (=', isubv, ')'

       endif

       call mpi_comm_rank( MPI_COMM_WORLD, rank, ierr )

       call mpi_comm_size( MPI_COMM_WORLD, size, ierr )

       flag = .false.

       call mpi_is_thread_main( flag, ierr )

       if (.not.flag) then

          errs = errs + 1

          print *, 'is_thread_main returned false for main thread'

       endif

       call mpi_query_thread( qprovided, ierr )

       if (qprovided .ne. provided) then

          errs = errs + 1

          print *,'query thread and init thread disagree on'// &

      &           ' thread level'

       endif

       call mpi_finalize( ierr )

       flag = .false.

       call mpi_finalized( flag, ierr )

       if (.not. flag) then

          errs = errs + 1

          print *, 'finalized returned false after finalize'

       endif

       if (rank .eq. 0) then

          if (errs .eq. 0) then

             print *, ' No Errors'

          else

             print *, ' Found ', errs, ' errors'

          endif

       endif

       end