列表8表现的关联的一个特殊方面是使用了另一个关联(比如，CheckOne)作为过滤值的条件。

One of the particular aspects of the relation presented in Listing 8 is that it makes use of another relation (for instance, CheckOne) as a condition for filtering values.

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解决这个问题的最佳方法是使用pthread_cond_wait调用来等待特殊条件发生。

The best way to do this is to use the pthread_cond_wait call to wait on a particular condition to become true.

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为了使识别条件发挥作用，请务必确保HATS对两个自定义都进行检查，不过需要使用特殊的检查顺序。

For this to work, you must make sure that HATS checks for both customizations — but in a particular order. If HATS USES the following order.

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