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MPI_Type_create_resized - Returns a new data type with new extent
and upper and lower bounds.
#include <mpi.h>
int MPI_Type_create_resized(MPI_Datatype oldtype, MPI_Aint lb,
MPI_Aint extent, MPI_Datatype *newtype)
INCLUDE ’mpif.h’
MPI_TYPE_CREATE_RESIZED(OLDTYPE, LB, EXTENT, NEWTYPE, IERROR)
INTEGER OLDTYPE, NEWTYPE, IERROR
INTEGER(KIND=MPI_ADDRESS_KIND) LB, EXTENT
#include <mpi.h>
MPI::Datatype MPI::Datatype::Create_resized(const MPI::Aint lb,
const MPI::Aint extent) const
- oldtype
- Input data type (handle).
- lb
- New lower bound of
data type (integer).
- extent
- New extent of data type (integer).
- newtype
- Output data type (handle).
- IERROR
- Fortran only: Error status (integer).
MPI_Type_create_resized returns in newtype a handle to a new
data type that is identical to oldtype, except that the lower bound of
this new data type is set to be lb, and its upper bound is set to be lb
+ extent. Any previous lb and ub markers are erased, and a new pair of lower
bound and upper bound markers are put in the positions indicated by the
lb and extent arguments. This affects the behavior of the data type when
used in communication operations, with count > 1, and when used in the construction
of new derived data types.
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.
Use of MPI_Type_create_resized is
strongly recommended over the old MPI-1 functions MPI_Type_extent and MPI_Type_lb.
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.
MPI_Type_get_extent
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