question: final int recordExceptionalCompletion ( Throwable ex ) { int s ; if ( ( s = status ) >= 0 ) { int h = System . identityHashCode ( this ) ; final ReentrantLock lock = exceptionTableLock ; lock . lock ( ) ; try { expungeStaleExceptions ( ) ; ExceptionNode [ ] t = exceptionTable ; int i = h & ( t . length - 1 ) ; for ( ExceptionNode e = t [ i ] ; ; e = e . next ) { if ( e == null ) { t [ i ] = new ExceptionNode ( this , ex , t [ i ] ) ; break ; } if ( e . get ( ) == this ) break ; } } finally { lock . unlock ( ) ; } s = setCompletion ( EXCEPTIONAL ) ; } return s ; }
target:  Records exception and sets status.