Description——事件描述符。
这些事件可以是诸如计时器，信号，文件描述符上预备读取的数据，等等。
These events can be things like timers, signals, data ready for reading on a file descriptor, and so on.
其中一个线程然后会对运行文件调用SPU_RUN ioctl系统调用，而其他线程则可以对邮箱文件和其他可能的文件描述符执行一个事件循环。
One of the threads then calls the SPU_RUN ioctl on the run file, while the other runs in an event loop on the mailbox files and potentially other file descriptors.
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