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。
When the ppe wants to access the mailbox, it needs to have access to the memory-mapped register space, which is normally only available to kernel space.
当PPE希望访问邮箱时，它需要能够访问内存映射的寄存器空间，后者通常只对于内核空间来说是可用的。
When an SPU tries to read from an empty mailbox, it will stop execution until some value is written to its memory-mapped register.
当spu视图从一个空的邮箱中读取信息时，它会停止执行，直到有值写入自己的内存映射寄存器中为止。
When an SPU tries to read from an empty mailbox, it will stop execution until some value is written to its memory-mapped register.
当spu视图从一个空的邮箱中读取信息时，它会停止执行，直到有值写入自己的内存映射寄存器中为止。
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