18.2.390. MPI_Type_extent
MPI_Type_extent - Returns the extent of a data type, the difference between the upper and lower bounds of the data type – use of this routine is deprecated.
18.2.390.1. SYNTAX
18.2.390.1.1. C Syntax
#include <mpi.h>
int MPI_Type_extent(MPI_Datatype datatype, MPI_Aint *extent)
18.2.390.1.2. Fortran Syntax
INCLUDE 'mpif.h'
MPI_TYPE_EXTENT(DATATYPE, EXTENT, IERROR)
INTEGER DATATYPE, EXTENT, IERROR
18.2.390.2. INPUT PARAMETER
datatype
: Datatype (handle).
18.2.390.3. OUTPUT PARAMETERS
extent
: Datatype extent (integer).IERROR
: Fortran only: Error status (integer).
18.2.390.4. DESCRIPTION
Note that use of this routine is deprecated as of MPI-2. Please use MPI_Type_get_extent instead.
MPI_Type_extent returns the extent of a data type, the difference between the upper and lower bounds of the data type.
In general, if
Typemap = {(type(0), disp(0)), ..., (type(n-1), disp(n-1))}
then the lower bound of Typemap is defined to be
( min(j) disp(j) if no entry has
lb(Typemap)=( basic type lb
(min(j) {disp(j) such that type(j) = lb} otherwise
Similarly, the upper bound of Typemap is defined to be
(max(j) disp(j) + sizeof(type(j)) + e if no entry has
ub(Typemap)=( basic type ub
(max(j) {disp(j) such that type(j) = ub} otherwise
Then
extent(Typemap) = ub(Typemap) - lb(Typemap)
If type(i) requires alignment to a byte address that is a multiple of k(i), then e is the least nonnegative increment needed to round extent(Typemap) to the next multiple of max(i) k(i).
18.2.390.5. 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.
See also