应当指出的是：如果一个操作系统平台只能依靠手工的方式去掉一些代码，这根本就不是可裁剪性。所谓可裁剪性是在软件工程阶段利用软件配置方法实现软件构件的“即插即用”。
可裁剪性带给用户的一个直接的好处是硬件成本降低，这对于成本敏感的应用，如消费电子类设备，具有重要的现实意义。由于设备中只包含应用程序用到的那部分操作系统功能，这就使得系统变得简单、易把握，从而提高系统的可靠性。
到位——实时性
许多人都把实时性理解为速度快。那么，速度快到什么程度才算是达到实时性呢？其实，所谓实时性，其核心含义在于确定性，而不是单纯的速度快。也就是说，RTOS所要求的是在规定的时间内做完应该做的事情，并且操作系统的行为（执行线索）是确定的，这是写出高可靠性程序的基础。如果完成同样的动作，有的时候快，有的时候慢，且执行线索千差万别，程序员无法把握，可靠性就无从保证。
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