Gets the number of "top level" elements
int MPI_Get_count( status, datatype, count )
|status ||return status of receive operation (Status)
|datatype ||datatype of each receive buffer element (handle)
- number of received elements (integer)
If the size of the datatype is zero, this routine will return a count of
zero. If the amount of data in status is not an exact multiple of the
size of datatype (so that count would not be integral), a count of
MPI_UNDEFINED is returned instead.
Notes for Fortran
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK)
havean additional argument ierr at the end of the argument list.
ierris an integer and has the same meaning as the return value of the
routinein C. In Fortran, MPI routines are subroutines, and are invoked with
All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type
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
lastargument. Before the value is returned, the current MPI error handler
iscalled. By default, this error handler aborts the MPI job. The error
handlermay be changed with MPI_Errhandler_set; the predefined error
handlerMPI_ERRORS_RETURN may be used to cause error values to be returned.
Note that MPI does not guarentee that an MPI program can continue
- No error; MPI routine completed successfully.
- Invalid datatype argument. May be an uncommitted
MPI_Datatype (see MPI_Type_commit).