NAME

       MPI_Keyval_free -  Frees an attribute key for communicators

SYNOPSIS

       int MPI_Keyval_free(int *keyval)

INPUT PARAMETERS

       keyval - Frees the integer key value (integer)

NOTE

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

DEPRECATED FUNCTION

       The  MPI-2 standard deprecated a number of routines because MPI-2 provides better versions.  This routine
       is one of those that was deprecated.  The routine may continue to be used, but new code  should  use  the
       replacement routine.  The replacement for this routine is MPI_Comm_free_keyval .

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.

NOTES FOR FORTRAN

       All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argument ierr at the
       end of the argument list.  ierr is an integer and has the same meaning as the return value of the routine
       in C.  In Fortran, MPI routines are subroutines, and are invoked with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.

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 guarentee 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_ARG
              -  Invalid  argument.   Some  argument  is invalid and is not identified by a specific error class
              (e.g., MPI_ERR_RANK ).
       MPI_ERR_ARG
              - This error class is associated with an error code that indicates that an  attempt  was  made  to
              free one of the permanent keys.

SEE ALSO

       MPI_Keyval_create, MPI_Comm_free_keyval

LOCATION

       src/mpi/attr/keyval_free.c

                                                    4/24/2013                                 MPI_Keyval_free(3)