|comm||Communicator to which attribute is attached (handle).|
Key value (integer).
attribute_val Attribute value, unless flag = false. flag True if an attribute value was extracted; false if no attribute is associated with the key. IERROR Fortran only: Error status (integer).
Note that use of this routine is deprecated as of MPI-2, and was deleted in MPI-3. Please use MPI_Comm_create_attr. This function does not have a C++ or mpi_f08 binding.
Retrieves attribute value by key. The call is erroneous if there is no key with value keyval. On the other hand, the call is correct if the key value exists, but no attribute is attached on comm for that key; in such case, the call returns flag = false. In particular MPI_KEYVAL_INVALID is an erroneous key value.
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.
|1.10.2||MPI_ATTR_GET (3)||Jan 21, 2016|