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MPI_Comm_set_attr - Stores attribute value associated with a key.
#include <mpi.h>
int MPI_Comm_set_attr(MPI_Comm comm, int comm_keyval, void *attribute_val)
INCLUDE ’mpif.h’
MPI_COMM_SET_ATTR(COMM, COMM_KEYVAL, ATTRIBUTE_VAL, IERROR)
INTEGER COMM, COMM_KEYVAL, IERROR
INTEGER(KIND=MPI_ADDRESS_KIND) ATTRIBUTE_VAL
#include <mpi.h>
void MPI::Comm::Set_attr(int comm_keyval, const void* attribute_val) const
- comm
- Communicator from which attribute will be attached
(handle).
- comm_keyval
- Key value (integer).
- attribute_val
- Attribute value.
- IERROR
- Fortran only: Error status (integer).
MPI_Comm_set_attr stores the stipulated attribute value attribute_val
for subsequent retrieval by MPI_Comm_get_attr. If the value is already present,
then the outcome is as if MPI_Comm_delete_attr was first called to delete
the previous value (and the callback function delete_fn was executed),
and a new value was next stored. The call is erroneous if there is no key
with value comm_keyval; in particular MPI_KEYVAL_INVALID is an erroneous
key value. The call will fail if the delete_fn function returned an error
code other than MPI_SUCCESS.
This function replaces MPI_Attr_put, the use
of which is deprecated. The C binding is identical. The Fortran binding differs
in that attribute_val is an address-sized integer.
The MPI
standard prescribes portable Fortran syntax for the ATTRIBUTE_VAL argument
only for Fortran 90. Sun FORTRAN 77 users may use the non-portable syntax
INTEGER*MPI_ADDRESS_KIND ATTRIBUTE_VAL
where MPI_ADDRESS_KIND is a constant defined in mpif.h and gives the length
of the declared integer in bytes.
Values of the permanent attributes
MPI_TAG_UB, MPI_HOST, MPI_IO, and MPI_WTIME_IS_GLOBAL may not be changed.
The type of the attribute value depends on whether C or Fortran is being
used. In C, an attribute value is a pointer (void *); in Fortran, it is
a single, address-size integer system for which a pointer does not fit in
an integer.
If an attribute is already present, the delete function (specified
when the corresponding keyval was created) will be called.
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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