Tells whether locking is required for that Lockable. Some Lockable may be locked or not, depending on the actual context.

surfaces can behave according to two ways: software ones must be locked, whereas hardware ones do not need that.

This default method returns always true, override it when locking is conditional.

Generated on Thu Jun 4 20:39:16 2009 for Ceylan by  doxygen 1.5.8