NAME

       MPI_Status_set_elements,  MPI_Status_set_elements_x  -  Modifies  opaque part of status to
       allow MPI_Get_elements to return count.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Status_set_elements(MPI_Status *status, MPI_Datatype datatype, int count)
       int MPI_Status_set_elements_x(MPI_Status *status, MPI_Datatype datatype, MPI_Count count)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_STATUS_SET_ELEMENTS(STATUS, DATATYPE, COUNT, IERROR)
            INTEGER   STATUS(MPI_STATUS_SIZE), DATATYPE, COUNT, IERROR
       MPI_STATUS_SET_ELEMENTS_X(STATUS, DATATYPE, COUNT, IERROR)
            INTEGER   STATUS(MPI_STATUS_SIZE), DATATYPE
               INTEGER(KIND=MPI_COUNT_KIND) COUNT
               INTEGER IERROR

C++ Syntax

       #include <mpi.h>
       void MPI::Status::Set_elements(const MPI::Datatype& datatype, int count)

INPUT/OUTPUT PARAMETER

       status    Status to associate with count (status).

INPUT PARAMETERS

       datatype  Data type associated with count (handle).

       count     Number of elements to associate with status (integer).

OUTPUT PARAMETER

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_Status_set_elements  modifies  the  opaque  part  of  status  so  that   a   call   to
       MPI_Get_elements  or  MPI_Get_elements_x  will  return  count. MPI_Get_count will return a
       compatible value.

       A subsequent call to MPI_Get_count(status, datatype, count),  to  MPI_Get_elements(status,
       datatype,  count),  or to MPI_Get_elements_x(status, datatype, count) must use a data-type
       argument that has the same type signature as the data-type argument that was used  in  the
       call to MPI_Status_set_elements.

NOTES

       Users  are  advised  not  to reuse the status fields for values other than those for which
       they were intended. Doing so may lead to unexpected results when using the status  object.
       For  example, calling MPI_Get_elements may cause an error if the value is out of range, or
       it may be impossible to detect such an error. The extra_state  argument  provided  with  a
       generalized  request  can  be used to return information that does not logically belong in
       status. Furthermore, modifying the values in a status  set  internally  by  MPI,  such  as
       MPI_Recv, may lead to unpredictable results and is strongly discouraged.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and
       Fortran routines in the last argument. C++ functions do not return errors. If the  default
       error  handler  is  set  to  MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception
       mechanism will be used to throw an MPI::Exception object.

       Before the error value is returned, the current MPI error handler is called.  By  default,
       this  error  handler aborts the MPI job, except for I/O function errors. The error handler
       may   be   changed   with   MPI_Comm_set_errhandler;   the   predefined   error    handler
       MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not
       guarantee that an MPI program can continue past an error.

FORTRAN 77 NOTES

       The  MPI  standard  prescribes  portable  Fortran  syntax  for  the  COUNT   argument   of
       MPI_Status_set_elements_x  only  for Fortran 90. FORTRAN 77 users may use the non-portable
       syntax

            INTEGER*MPI_COUNT_KIND COUNT

       where MPI_COUNT_KIND is a constant defined in mpif.h and gives the length of the declared integer in bytes.