NAME

       MPI_Attr_get -  Retrieves attribute value by key

SYNOPSIS

       int MPI_Attr_get(MPI_Comm comm, int keyval, void *attribute_val, int *flag)

INPUT PARAMETERS

       comm   - communicator to which attribute is attached (handle)
       keyval - key value (integer)

OUTPUT PARAMETERS

       attribute_val
              - attribute value, unless flag = false (None)
       flag   -  true  if  an  attribute value was extracted; false if no attribute is associated
              with the key (logical)

DEPRECATED FUNCTION

       The current MPI standard defines this routine as deprecated. The routine may  continue  to
       be  used,  but  new  code  should  use  the replacement routine.  The replacement for this
       routine is MPI_Comm_get_attr .

THREAD AND INTERRUPT SAFETY

       This routine is thread-safe.  This means that this routine may be safely used by  multiple
       threads  without the need for any user-provided thread locks.  However, the routine is not
       interrupt safe.  Typically, this is due to the use of memory allocation routines  such  as
       malloc or other non-MPICH runtime routines that are themselves not interrupt-safe.

ERRORS

       All  MPI  routines  (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as
       the value of the function and Fortran routines in the last argument.  Before the value  is
       returned,  the current MPI error handler is called.  By default, this error handler aborts
       the MPI  job.   The  error  handler  may  be  changed  with  MPI_Comm_set_errhandler  (for
       communicators),  MPI_File_set_errhandler  (for files), and MPI_Win_set_errhandler (for RMA
       windows).  The MPI-1 routine MPI_Errhandler_set may be used but  its  use  is  deprecated.
       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; however, MPI implementations will attempt to continue whenever possible.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.

       MPI_ERR_OTHER
              - Other error; use MPI_Error_string to get more information about this error code.

SEE ALSO

       MPI_Attr_put, MPI_Keyval_create, MPI_Attr_delete, MPI_Comm_get_attr

                                            2/22/2022                             MPI_Attr_get(3)