a-foundation-benchmark/src/main/java/com/ajjpj/afoundation/concurrent/jdk/j9new/ForkJoinPool.java
final int externalHelpComplete(CountedCompleter<?> task, int maxTasks) {
        WorkQueue[] ws; int n;
        int r = ThreadLocalRandomHelper.getProbe();
        return ((ws = workQueues) == null || (n = ws.length) == 0) ? 0 :
            helpComplete(ws[(n - 1) & r & SQMASK], task, maxTasks);
    }
final int externalHelpComplete(CountedCompleter<?> task, int maxTasks) {
        WorkQueue[] ws; int n;
        int r = ThreadLocalRandomHelper.getProbe();
        return ((ws = workQueues) == null || (n = ws.length) == 0) ? 0 :
            helpComplete(ws[(n - 1) & r & SQMASK], task, maxTasks);
    }
Performs helpComplete for an external submitter.