状态使用一个整数表示，表示过程是否成功。
The status is an integer that indicates the success of the procedure.
因为优先级是用整数表示的，所以规范的实现可以提供更多的优先级别。
Since the priority is represented as an integer an implementation could provide many more.
因为优先级是用整数表示的，所以规范的实现可以提供更多的优先级别。
Since the priority is represented as an integer an implementation could provide many more.
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