NAME

       MPI_Attr_delete  - Deletes attribute value associated with a key -- use of this routine is
       deprecated.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Attr_delete(MPI_Comm comm, int keyval)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_ATTR_DELETE(COMM, KEYVAL, IERROR)
            INTEGER   COMM, KEYVAL, IERROR

INPUT PARAMETERS

       comm      Communicator to which attribute is attached (handle).

       keyval    The key value of the deleted attribute (integer).

OUTPUT PARAMETER

       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_delete_attr.  This function does not have a C++ or mpi_f08 binding.

       Delete  attribute  from  cache by key. This function invokes the attribute delete function
       delete_fn specified when the keyval was created. The  call  will  fail  if  the  delete_fn
       function returns an error code other than MPI_SUCCESS.

       Whenever  a  communicator is replicated using the function MPI_Comm_dup, all callback copy
       functions for attributes that are currently set are invoked (in arbitrary order). Whenever
       a  communicator is deleted using the function MPI_Comm_free, all callback delete functions
       for attributes that are currently set are invoked.

NOTES

       Note that it is not defined by the MPI standard what happens  if  the  delete_fn  callback
       invokes other MPI functions.  In Open MPI, it is not valid for delete_fn callbacks (or any
       of their children) to add or delete attributes on the same object on which  the  delete_fn
       callback is being invoked.

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_delete_attr