static final void cancelIgnoringExceptions(ForkJoinTask<?> t){
  if (t != null && t.status >= 0) {
    try {
      t.cancel(false);
    }
 catch (    Throwable ignore) {
    }
  }
}

static final void cancelIgnoringExceptions ( ForkJoinTask < ? > t ) { if ( t != null && t . status >= 0 ) { try { t . cancel ( false ) ; } catch ( Throwable ignore ) { } } }
cancels , ignoring any exceptions thrown by cancel . used during worker and pool shutdown . cancel is spec ' ed not to throw any exceptions , but if it does anyway , we have no recourse during shutdown , so guard against this case .
