NAME

       MPI_Attr_get - Retrieves attribute value by key -- use of this routine is deprecated.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Attr_get(MPI_Comm comm, int keyval,void *attribute_val,
            int *flag )

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_ATTR_GET(COMM, KEYVAL, ATTRIBUTE_VAL, FLAG, IERROR)
            INTEGER   COMM, KEYVAL, ATTRIBUTE_VAL, IERROR
            LOGICAL   FLAG

INPUT PARAMETERS

       comm      Communicator to which attribute is attached (handle).

       keyval
                  Key value (integer).

OUTPUT PARAMETERS

       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).

DESCRIPTION

       Note  that  use  of  this  routine  is  deprecated  as  of  MPI-2,  and  was deleted in MPI-3. Please use
       MPI_Comm_get_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.

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++ 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.

SEE ALSO

       MPI_Comm_get_attr

4.1.6                                             Sep 30, 2023                                   MPI_Attr_get(3)