在上一节中，我们意识到，我们需要的不仅仅是简单的多线程多。
In the previous section, we realised that we need more than simple multithreading.
不需要编写一直运行的多线程的作业处理应用程序(因此不会有内存泄漏)，而是由cron启动一个简单的批处理脚本。
Instead of having a multithreaded job-processing application that runs forever and, thus, can never leak memory, you have a simple batch script that cron starts.
它们可能涉及到多线程，或者简单的为同步更新提供一个切入点。
They might involve multithreading, or they might simply provide an entry point for synchronous updates.
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