So this succeeds without any priority specification.
所以这样不需要任何优先级规范就可以成功。
This feature uses an obscure aspect of the C language to simplify the specification of message level or priority.
这个特性使用了 C 语言的一种模糊方面来简化消息级别和优先级的规范。
The net effect is that P2 priority threads run in preference to the P1 thread which is not what the specification requires.
实际看到的效果是P2优先级的线程要优先于P 1线程，而这并不是规范里要求的。
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