clean_up - periodically called in inactive objects
int clean_up( int inherited );
The clean_up() function is called by the driver on a regular basis in
all objects that have been inactive for the time specified for
clean_up() in the runtime configuration file. One flag is passed to
the function, specifying whether or not the object has been inheritted
by anything. The inherited passed as argument will be 0 for clone objects,
1 for a simple loaded object, and greater when the object is cloned or
inherited by some existing object. It is recommended not to self_destruct
the object when the reference count is greater than one.
If clean_up() returns 0, clean_up() will never be called
again on that object. If it returns 1, it will be called again when
the object remains inactive for the specified clean_up() delay.
One thing that might be commonly done by an object in this function is
destructing itself to conserve memory.