如果编码不正确，那么可能丢失通知，导致线程保持空闲状态，尽管队列中有工作要处理。
If coded incorrectly, it is possible for notifications to be lost, resulting in threads remaining in an idle state even though there is work in the queue to be processed.
如果应用程序发现设置了警告标记，它将通知用户该数据已被使用，所做的任何更改可能都会丢失。
If an application sees the warning flag set, it could inform the user that this data is already in use and any changes made may be lost.
您必须通知(通过一个不会产生中断的方法)调用程序，一个邮件地址将要丢失。
You might let your calling program know (through a non-interruptive approach) that an E-mail address might be missing.
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