java 标签

private boolean addWorker(Runnable firstTask, boolean core) {
    // 定义一个标签
    retry:
    for (;;) {
        int c = ctl.get();
        int rs = runStateOf(c);
        // Check if queue empty only if necessary.
        if (rs >= SHUTDOWN &&
            ! (rs == SHUTDOWN &&
               firstTask == null &&
               ! workQueue.isEmpty()))
            return false;
        for (;;) {
            int wc = workerCountOf(c);
            if (wc >= CAPACITY ||
                wc >= (core ? corePoolSize : maximumPoolSize))
                return false;
            if (compareAndIncrementWorkerCount(c))
                // 这里循环出来
                break retry;
            c = ctl.get();  // Re-read ctl
            if (runStateOf(c) != rs)
                // 这里走到标签那里
                continue retry;
            // else CAS failed due to workerCount change; retry inner loop
        }
    }
    ...
 }