17.2.400. MPI_Type_get_extent
MPI_Type_get_extent, MPI_Type_get_extent_x - Returns the lower bound and extent of a data type.
17.2.400.1. SYNTAX
17.2.400.1.1. C Syntax
#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)
17.2.400.1.2. Fortran Syntax (see FORTRAN 77 NOTES)
USE MPI
! or the older form: 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
17.2.400.1.3. Fortran 2008 Syntax
USE mpi_f08
MPI_Type_get_extent(datatype, lb, extent, ierror)
TYPE(MPI_Datatype), INTENT(IN) :: datatype
INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(OUT) :: lb, extent
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
MPI_Type_get_extent_x(datatype, lb, extent, ierror)
TYPE(MPI_Datatype), INTENT(IN) :: datatype
INTEGER(KIND = MPI_COUNT_KIND), INTENT(OUT) :: lb, extent
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
17.2.400.2. INPUT PARAMETER
datatype
: Data type (handle).
17.2.400.3. OUTPUT PARAMETERS
lb
: Lower bound of data type (integer).extent
: Data type extent (integer).IERROR
: Fortran only: Error status (integer).
17.2.400.4. DESCRIPTION
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.
17.2.400.5. NOTE
Use of MPI_Type_get_extent is strongly recommended over the old MPI-1 functions MPI_Type_extent and MPI_Type_lb.
17.2.400.6. 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
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.
17.2.400.7. ERRORS
Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument.
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.