C -*- Mode: Fortran; -*- 
C
C  (C) 2003 by Argonne National Laboratory.
C      See COPYRIGHT in top-level directory.
C
C This is a special test that requires an getarg/iargc routine 
C
        program main
C     This implicit none is removed here because the iargc was not
C     declared on the old sparc compilers
C       implicit none
        include 'mpif.h'
        integer errs, err
        integer rank, size, rsize, i
        integer np
        integer errcodes(2)
        integer parentcomm, intercomm
        integer status(MPI_STATUS_SIZE)
        character*(10) inargv(6), outargv(6)
        character*(80)   argv(64)
        integer argc
        data inargv /"a", "b=c", "d e", "-pf", " Ss", " " /
        data outargv /"a", "b=c", "d e", "-pf", " Ss", " " /
        integer ierr
        integer can_spawn

        errs = 0
        np   = 2


        call MTest_Init( ierr )

        call MTestSpawnPossible( can_spawn, errs )
        if ( can_spawn .eq. 0 ) then
            call MTest_Finalize( errs )
            goto 300
        endif

        call MPI_Comm_get_parent( parentcomm, ierr )

        if (parentcomm .eq. MPI_COMM_NULL) then
C       Create 2 more processes 
           call MPI_Comm_spawn( "./spawnargvf", inargv, np,
     $          MPI_INFO_NULL, 0, MPI_COMM_WORLD, intercomm, errcodes,
     $          ierr )  
        else 
           intercomm = parentcomm
        endif

C       We now have a valid intercomm

        call MPI_Comm_remote_size( intercomm, rsize, ierr )
        call MPI_Comm_size( intercomm, size, ierr )
        call MPI_Comm_rank( intercomm, rank, ierr )

        if (parentcomm .eq. MPI_COMM_NULL) then
C           Master 
        if (rsize .ne. np) then
            errs = errs + 1
            print *, "Did not create ", np, " processes (got
     $           ", rsize, ")"  
         endif
         do i=0, rsize-1
            call MPI_Send( i, 1, MPI_INTEGER, i, 0, intercomm, ierr )
         enddo
C       We could use intercomm reduce to get the errors from the 
C       children, but we'll use a simpler loop to make sure that
C       we get valid data 
         do i=0, rsize-1
            call MPI_Recv( err, 1, MPI_INTEGER, i, 1, intercomm,
     $           MPI_STATUS_IGNORE, ierr ) 
            errs = errs + err
         enddo
        else 
C       Child 
C       FIXME: This assumes that stdout is handled for the children
C       (the error count will still be reported to the parent)
           argc = iargc()
           do i=1, argc
              call getarg( i, argv(i) )
           enddo
        if (size .ne. np) then
            errs = errs + 1
            print *, "(Child) Did not create ", np, " processes (got ",
     $           size, ")" 
         endif

         call MPI_Recv( i, 1, MPI_INTEGER, 0, 0, intercomm, status, ierr
     $        ) 
        if (i .ne. rank) then
           errs = errs + 1
           print *, "Unexpected rank on child ", rank, "(",i,")"
        endif
C       Check the command line 
        do i=1, argc
           if (outargv(i) .eq. " ") then
              errs = errs + 1
              print *, "Wrong number of arguments (", argc, ")"
              goto 200
           endif
           if (argv(i) .ne. outargv(i)) then
              errs = errs + 1
              print *, "Found arg ", argv(i), " but expected ",
     $             outargv(i)  
           endif
        enddo
 200    continue
        if (outargv(i) .ne. " ") then
C       We had too few args in the spawned command 
            errs = errs + 1
            print *, "Too few arguments to spawned command"
         endif
C       Send the errs back to the master process 
         call MPI_Ssend( errs, 1, MPI_INTEGER, 0, 1, intercomm, ierr )
        endif

C       It isn't necessary to free the intercomm, but it should not hurt
        call MPI_Comm_free( intercomm, ierr )

C       Note that the MTest_Finalize get errs only over COMM_WORLD 
        if (parentcomm .eq. MPI_COMM_NULL) then
           call MTest_Finalize( errs )
        else
           call MPI_Finalize( ierr )
        endif

 300    continue
        end