阻塞赋值 blocking assignment
非阻塞赋值 nonblocking assignments ; Non-blocking
建模时使用非阻塞赋值 nonblocking assignment
如果您提供一个时间，那么添加具有此键的一个新值就会被阻塞这个特定的时期。
If you supply a time, adding a new value with this key is blocked for the specified period.
SCA并不定义对返回值或声明要引发异常的方法的非阻塞调用的机制。
SCA does not define a mechanism for making non-blocking calls to methods that return values or are declared to throw exceptions.
相反，Abort并不会阻塞线程(也不会抛出任何异常)，因此没有Timeout值，也并不包含异步版本。
Abort conversely is not supposed to block (or throw any expected exceptions), and therefore doesn't have a timeout or an async version.
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