osx man page for mpi_keyval_free

MPI_Keyval_free(3OpenMPI)												 MPI_Keyval_free(3OpenMPI)

NAME
       MPI_Keyval_free - Frees attribute key for communicator cache attribute -- use of this routine is deprecated.

SYNTAX
C Syntax
       #include <mpi.h>
       int MPI_Keyval_free(int *keyval)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_KEYVAL_FREE(KEYVAL, IERROR)
	    INTEGER   KEYVAL, IERROR

INPUT PARAMETER
       keyval	 Frees the integer key value (integer).

OUTPUT PARAMETER
       IERROR	 Fortran only: Error status (integer).

DESCRIPTION
       Note that use of this routine is deprecated as of MPI-2. Please use MPI_Comm_free_keyval instead.

       This deprecated routine is not available in C++.

       Frees  an  extant  attribute  key.  This function sets the value of keyval to  MPI_KEYVAL_INVALID. Note that it is not erroneous to free an
       attribute key that is in use, because the actual free does not transpire until after all references (in other communicators on the process)
       to  the	key have been freed. These references need to be explictly freed by the program, either via calls to MPI_Attr_delete that free one
       attribute instance, or by calls to MPI_Comm_free that free all attribute instances associated with the freed communicator.

NOTE
       Key values are global (they can be used with any and all communicators).

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++ func-
       tions  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_Keyval_create

Open MPI 1.2							  September 2006					 MPI_Keyval_free(3OpenMPI)