Rather than sharing variables in memory, the mailbox effectively separates distinct processes from each other.
邮箱有效地将各个进程彼此分开，而不用共享内存中的变量。
For example, one PPE-side mailbox register appears as a write-only physical memory location.
例如，一个ppe端的邮箱寄存器会作为一个只写的物理内存位置出现。
Source adapter controller - the source adapter controller has an in-memory "mailbox" that it monitors to pick up events and passes them to the corresponding collaboration.
源适配器控制器——源适配器控制器在内存中具有一个“邮箱”，它对此邮箱进行监视，以拾取事件，并将其传递到相应的协作中。
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