question: private void clearExceptionalCompletion ( ) { int h = System . identityHashCode ( this ) ; final ReentrantLock lock = exceptionTableLock ; lock . lock ( ) ; try { ExceptionNode [ ] t = exceptionTable ; int i = h & ( t . length - 1 ) ; ExceptionNode e = t [ i ] ; ExceptionNode pred = null ; while ( e != null ) { ExceptionNode next = e . next ; if ( e . get ( ) == this ) { if ( pred == null ) t [ i ] = next ; else pred . next = next ; break ; } pred = e ; e = next ; } expungeStaleExceptions ( ) ; status = 0 ; } finally { lock . unlock ( ) ; } }
target:  Removes exception node and clears status.