MPI_Get_count - Gets the number of "top level" elements
int MPI_Get_count(const MPI_Status * status, MPI_Datatype datatype, int *count)
- status
- - return status of receive operation (Status)
- datatype
- - datatype of each receive buffer element (handle)
- count
- - number of received elements (integer) Notes: 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.
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.
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_Comm_set_errhandler (for communicators),
MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler
(for RMA windows). The MPI-1 routine MPI_Errhandler_set may be used but
its use is deprecated. 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; however,
MPI implementations will attempt to continue whenever possible.
- MPI_SUCCESS
- - No error; MPI routine completed successfully.
- MPI_ERR_TYPE
- - Invalid datatype argument. Additionally, this error can occur if an
uncommitted MPI_Datatype (see MPI_Type_commit ) is used in a
communication call.