可以基于任务来设定优先权，例如用于屏幕存储器的线程应该低于一般水平。
Can set thread priority based on task semantic, such as below normal for a screen saver.
假设你去买苹果电脑，你可能得到的是英特尔生产的CPU， 西门子的硬盘驱动，三星制作的屏幕，日立造的存储器等等。
If you go and buy an Apple Computer, you are likely to get a CPU made by Intel, a hard drive by Seagate, a screen made by Samsung, memory by Hitachi and so on.
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