MPI_Type_get_extent − Returns the lower bound and extent of a data type.
#include
<mpi.h>
int MPI_Type_get_extent(MPI_Datatype datatype,
MPI_Aint *lb,
MPI_Aint *extent) |
INCLUDE
’mpif.h’
MPI_TYPE_GET_EXTENT(DATATYPE, LB, EXTENT, IERROR)
INTEGER |
DATATYPE, IERROR |
|||
INTEGER(KIND=MPI_ADDRESS_KIND) LB, EXTENT |
#include
<mpi.h>
void MPI::Datatype::Get_extent(MPI::Aint& lb,
MPI::Aint& extent)
const |
datatype |
Data type (handle). |
lb |
Lower bound of data type (integer). |
|||
extent |
Data type extent (integer). |
|||
IERROR |
Fortran only: Error status (integer). |
MPI_Type_get_extent returns the lower bound and the extent of datatype.
Use of MPI_Type_get_extent is strongly recommended over the old MPI-1 functions MPI_Type_extent and MPI_Type_lb.
The MPI standard prescribes portable Fortran syntax for the LB and EXTENT arguments only for Fortran 90. FORTRAN 77 users may use the non-portable syntax
INTEGER*MPI_ADDRESS_KIND
LB
or
INTEGER*MPI_ADDRESS_KIND EXTENT
where MPI_ADDRESS_KIND is a constant defined in mpif.h and gives the length of the declared integer in bytes.
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.