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NAME
MPI_Type_create_keyval - Generates a new attribute key for caching on
data types.
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Type_create_keyval(MPI_Type_copy_attr_function *type_copy_attr_fn,
MPI_Type_delete_attr_function *type_delete_attr_fn,
int *type_keyval, void *extra_state)
Fortran Syntax (see FORTRAN 77 NOTES)
INCLUDE 'mpif.h'
MPI_TYPE_CREATE_KEYVAL(TYPE_COPY_ATTR_FN, TYPE_DELETE_ATTR_FN,
TYPE_KEYVAL, EXTRA_STATE, IERROR)
EXTERNAL TYPE_COPY_ATTR_FN, TYPE_DELETE_ATTR_FN
INTEGER TYPE_KEYVAL, IERROR
INTEGER(KIND=MPI_ADDRESS_KIND) EXTRA_STATE
C++ Syntax
#include <mpi.h>
static int MPI::Datatype::Create_keyval(MPI::Datatype::Copy_attr_function*
type_copy_attr_fn, MPI::Datatype::Delete_attr_function*
type_delete_attr_fn, void* extra_state)
INPUT PARAMETERS
type_copy_attr_fn
Copy callback function for type_keyval (function).
type_delete_attr_fn
Delete callback function for type_keyval (function).
extra_state
Extra state for callback functions.
OUTPUT PARAMETERS
type_keyval
Key value for future access (integer).
IERROR Fortran only: Error status (integer).
DESCRIPTION
MPI_Type_create_keyval generates a new attribute key for caching on
data types. This routine partially replaces MPI_Keyval_create.
The argument type_copy_attr_fn may be specified as
MPI_TYPE_NULL_COPY_FN or MPI_TYPE_DUP_FN from C, C++, or Fortran.
MPI_TYPE_NULL_COPY_FN is a function that does nothing other than
returning flag = 0 and MPI_SUCCESS. MPI_TYPE_DUP_FN is a simple-minded
copy function that sets flag = 1, returns the value of attribute_val_in
in attribute_val_out, and returns MPI_SUCCESS.
and
typedef int MPI_Type_delete_attr_function(MPI_Datatype type, int type_keyval,
void *attribute_val, void *extra_state);
The Fortran callback functions are:
SUBROUTINE TYPE_COPY_ATTR_FN(OLDTYPE, TYPE_KEYVAL, EXTRA_STATE,
ATTRIBUTE_VAL_IN, ATTRIBUTE_VAL_OUT, FLAG, IERROR)
INTEGER OLDTYPE, TYPE KEYVAL, IERROR
INTEGER(KIND=MPI_ADDRESS_KIND) EXTRA_STATE,
ATTRIBUTE_VAL_IN, ATTRIBUTE_VAL_OUT
LOGICAL FLAG
and
SUBROUTINE TYPE_DELETE_ATTR_FN(TYPE, TYPE_KEYVAL, ATTRIBUTE_VAL, EXTRA_STATE,
IERROR)
INTEGER TYPE, TYPE_KEYVAL, IERROR
INTEGER(KIND=MPI_ADDRESS_KIND) ATTRIBUTE VAL, EXTRA_STATE
The C++ callbacks are:
typedef int MPI::Datatype::Copy_attr_function(const MPI::Datatype& oldtype,
int type_keyval, void* extra_state,
const void* attribute_val_in, void* attribute_val_out,
bool& flag);
and
typedef int MPI::Datatype::Delete_attr_function(MPI::Datatype& type,
int type_keyval, void* attribute_val, void* extra_state);
FORTRAN 77 NOTES
The MPI standard prescribes portable Fortran syntax for the EXTRA_STATE
argument only for Fortran 90. FORTRAN 77 users may use the non-porta-
ble syntax
INTEGER*MPI_ADDRESS_KIND EXTRA_STATE
where MPI_ADDRESS_KIND is a constant defined in mpif.h and gives the
length of the declared integer in bytes.
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++ func-
tions 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_free_keyval
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