@@ -39,10 +39,11 @@
  * @brief A class providing a pool of reusable threads.
  *
  * @note When the thread pool is released, all threads will terminate after
  *	 they finish the job they are currently processing.
  */
+OF_SUBCLASSING_RESTRICTED
 @interface OFThreadPool: OFObject
 {
 	size_t _size;
 	OFMutableArray *_threads;
 	volatile int _count;