NAME¶
MPI_Type_create_resized - Returns a new data type with new extent and
upper and lower bounds.
SYNTAX¶
C Syntax¶
#include <mpi.h>
int MPI_Type_create_resized(MPI_Datatype oldtype, MPI_Aint lb,
MPI_Aint extent, MPI_Datatype *newtype)
Fortran Syntax (see FORTRAN 77 NOTES)¶
INCLUDE 'mpif.h'
MPI_TYPE_CREATE_RESIZED( OLDTYPE, LB, EXTENT, NEWTYPE, IERROR)
INTEGER OLDTYPE, NEWTYPE, IERROR
INTEGER(KIND=MPI_ADDRESS_KIND) LB, EXTENT
C++ Syntax¶
#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).
OUTPUT PARAMETERS¶
- newtype
- Output data type (handle).
- IERROR
- Fortran only: Error status (integer).
DESCRIPTION¶
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.
FORTRAN 77 NOTES¶
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.
NOTE¶
Use of MPI_Type_create_resized is strongly recommended over the old MPI-1
functions MPI_Type_extent and MPI_Type_lb.
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.
SEE ALSO¶
MPI_Type_get_extent