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MPI_Type_get_extent, MPI_Type_get_extent_x - 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)
int MPI_Type_get_extent_x(MPI_Datatype datatype, MPI_Count *lb,
MPI_Count *extent)
INCLUDE ’mpif.h’
MPI_TYPE_GET_EXTENT(DATATYPE, LB, EXTENT, IERROR)
INTEGER DATATYPE, IERROR
INTEGER(KIND=MPI_ADDRESS_KIND) LB, EXTENT
MPI_TYPE_GET_EXTENT_X(DATATYPE, LB, EXTENT, IERROR)
INTEGER DATATYPE, IERROR
INTEGER(KIND=MPI_COUNT_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. For either function, if either
the lb or extent parameter cannot express the value to be returned (e.g.,
if the parameter is too small to hold the output value), it is set to MPI_UNDEFINED.
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
MPI_Type_get_extent:
INTEGER*MPI_ADDRESS_KIND LB
or
INTEGER*MPI_ADDRESS_KIND EXTENT
MPI_Type_get_extent_x:
INTEGER*MPI_COUNT_KIND LB
or
INTEGER*MPI_COUNT_KIND EXTENT
where MPI_ADDRESS_KIND and MPI_COUNT_KIND are constants defined in mpif.h
and give 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.
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