| MPI_TYPE_GET_EXTENT(datatype, lb, extent) | |
| IN datatype | datatype to get information on (handle) |
| OUT lb | lower bound of datatype (integer) |
| OUT extent | extent of datatype (integer) |
int MPI_Type_get_extent(MPI_Datatype datatype, MPI_Aint *lb, MPI_Aint *extent)
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(DATATYPE, LB, EXTENT, IERROR)
INTEGER DATATYPE, IERROR
INTEGER(KIND=MPI_ADDRESS_KIND) LB, EXTENT
| MPI_TYPE_GET_EXTENT_X(datatype, lb, extent) | |
| IN datatype | datatype to get information on (handle) |
| OUT lb | lower bound of datatype (integer) |
| OUT extent | extent of datatype (integer) |
int MPI_Type_get_extent_x(MPI_Datatype datatype, MPI_Count *lb, MPI_Count *extent)
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
MPI_TYPE_GET_EXTENT_X(DATATYPE, LB, EXTENT, IERROR)
INTEGER DATATYPE, IERROR
INTEGER(KIND=MPI_COUNT_KIND) LB, EXTENT
Returns the lower bound and the extent of datatype (as defined in Equation 1 ).
For both functions, if either OUT 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.
MPI allows one to change the extent of a datatype, using lower bound and upper bound markers. This provides control over the stride of successive datatypes that are replicated by datatype constructors, or are replicated by the count argument in a send or receive call.
| MPI_TYPE_CREATE_RESIZED(oldtype, lb, extent, newtype) | |
| IN oldtype | input datatype (handle) |
| IN lb | new lower bound of datatype (integer) |
| IN extent | new extent of datatype (integer) |
| OUT newtype | output datatype (handle) |
int MPI_Type_create_resized(MPI_Datatype oldtype, MPI_Aint lb, MPI_Aint extent, MPI_Datatype *newtype)
MPI_Type_create_resized(oldtype, lb, extent, newtype, ierror)
INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(IN) :: lb, extent
TYPE(MPI_Datatype), INTENT(IN) :: oldtype
TYPE(MPI_Datatype), INTENT(OUT) :: newtype
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
MPI_TYPE_CREATE_RESIZED(OLDTYPE, LB, EXTENT, NEWTYPE, IERROR)
INTEGER OLDTYPE, NEWTYPE, IERROR
INTEGER(KIND=MPI_ADDRESS_KIND) LB, EXTENT
Returns in newtype a handle to a new datatype that is identical to oldtype, except that the lower bound of this new datatype 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 datatype when used in communication operations, with count >1, and when used in the construction of new derived datatypes.