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_set++

_set++

_set++

_set++

2

If you don't set this , it will be set to whatever the name of the model is plus _set appended (something like account_set).

如果不设置此属性，则它将被设为模型名加上 _set （类似 account_set ）。

3

First , _set is declared volatile , which implies that the field can be accessed by multiple threads .

首先，_set 被声明为 volatile ，这表示这个域可以由多个线程访问。

4

Finally , _set++ is not protected by a lock .

最后，_set++并没有锁保护。

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