0 indicates that the message is not a priority message.
表示该消息不是优先消息。
It indicates whether this is a high-priority message from the system that must be presented before all other messages-for example, that a key script has stopped functioning.
它指示这是否是一个高优先级消息，必须在所有其他消息之前进行展示——例如，一个关键脚本停止工作。
Design the priority message queue mechanism and optimize the performance at the same time.
完成了优先级消息队列机制的设计，优化了系统的性能。
Design the priority message queue mechanism and optimize the performance at the same time.
完成了优先级消息队列机制的设计，优化了系统的性能。
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