Basically, there is only one upcall, with information as to what events caused it available from a pre_agreed mailbox.
基本上，只有一个回调，带着来自一个预先设定的信箱信息，信息说明在什么事件发生时，线程可用。
What if the UTS doesn't process the TCBs before another upcall happens? Do we run the risk of overflowing the TCB chain?
如果在新的回调发生时，UTS不能处理TCB怎么办，要运行这个存在溢出危险的TC B链吗。
What if the UTS doesn't process the TCBs before another upcall happens? Do we run the risk of overflowing the TCB chain?
如果在新的回调发生时，UTS不能处理TCB怎么办，要运行这个存在溢出危险的TC B链吗。
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