顺便说一下，我在这说“文件”，但数据源可以是任何东西——一个非常大的文件块，一个SQL查询返回的元组，一个邮箱文件中的单个邮件信息。
By the way, I'm saying "files" here, but the data source could really be anything - chunks of a very large file, rows returned from an SQL query, individual email messages from a mailbox file.
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.
如果您需要马上处理一份PD F文件，把它从您的邮箱导入iBooks，然后您怎么处理都可以。
If you need to urgently work with a PDF file you can just import it from your mail to the iBook and do whatever you want.
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