}
            ThreadUtil.sleep(systemCpuCheckInterval);
            count = waitingThreadNames.size();
        }
    }

    /**
     * Gets the system CPU usage percentage.
     *
     * @return The system CPU usage percentage.
     */
    protected short getSystemCpuPercent() {
        final long now = getCurrentTimeAsLong();
        if (now - systemCpuCheckTime > systemCpuCheckInterval) {