MPI_Pack(3)                           MPI                          MPI_Pack(3)



NAME
       MPI_Pack -  Packs a datatype into contiguous memory

SYNOPSIS
       #include "mpi.h"
       int MPI_Pack ( void *inbuf, int incount, MPI_Datatype datatype,
                      void *outbuf, int outcount, int *position, MPI_Comm comm )

INPUT PARAMETERS
       inbuf  - input buffer start (choice)
       incount
              - number of input data items (integer)
       datatype
              - datatype of each input data item (handle)
       outcount
              - output buffer size, in bytes (integer)
       position
              - current position in buffer, in bytes (integer)
       comm   - communicator for packed message (handle)


OUTPUT PARAMETER
       outbuf - output buffer start (choice)


NOTES FOR FORTRAN
       All  MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have
       an additional argument ierr at the end of the argument list.   ierr  is
       an  integer and has the same meaning as the return value of the routine
       in C.  In Fortran, MPI routines are subroutines, and are  invoked  with
       the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in
       Fortran.


ERRORS
       All MPI routines (except MPI_Wtime and  MPI_Wtick  )  return  an  error
       value;  C routines as the value of the function and Fortran routines in
       the last argument.  Before the value is returned, the current MPI error
       handler  is called.  By default, this error handler aborts the MPI job.
       The error handler may be changed with MPI_Errhandler_set ;  the  prede-
       fined error handler MPI_ERRORS_RETURN may be used to cause error values
       to be returned.  Note that MPI does not guarentee that an  MPI  program
       can continue past an error.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_ERR_COMM
              -  Invalid communicator.  A common error is to use a null commu-
              nicator in a call (not even allowed in MPI_Comm_rank ).
       MPI_ERR_TYPE
              - Invalid datatype argument.  May be an uncommitted MPI_Datatype
              (see MPI_Type_commit ).
       MPI_ERR_COUNT
              - Invalid count argument.  Count arguments must be non-negative;
              a count of zero is often valid.
       MPI_ERR_ARG
              - Invalid argument.  Some argument is invalid and is not identi-
              fied by a specific error class (e.g., MPI_ERR_RANK ).


SEE ALSO
       MPI_Unpack, MPI_Pack_size


LOCATION
       pack.c



                                  11/14/2001                       MPI_Pack(3)