Lock (GNUstepBase) /**  * Initializes the id pointed to by location  * with a new instance of the receiver's class  * in a thread safe manner, unless  * it has been previously initialized.  * Returns the contents pointed to by location.    * The location is considered unintialized if it contains nil.  * <br/>  * This method is used in the GS_INITIALIZED_LOCK macro  * to initialize lock variables when it cannot be insured  * that they can be initialized in a thread safe environment.  * <example>  * NSLock *my_lock = nil;  *  * void function (void)  * {  *   [GS_INITIALIZED_LOCK(my_lock, NSLock) lock];  *   do_work ();  *   [my_lock unlock];  * }  *   * </example>  */ + (id) newLockAt: (id *)location; @end  