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用于嵌入式环境的操作系统RTOS与桌面操作系统有很多本质的不同。这些不同的特性导致产品开发的不同结果。
嵌入式环境给人的印象就是占用空间小。所以，普通的Linux或者Windows操作系统要变成嵌入式操作系统，首先就是要进行裁剪。然而，与桌面环境相比，嵌入式环境对于操作系统系统要求不仅仅是“小”，二者在设计要求上有着本质的不同。这些不同主要体现在可裁剪性、实时性和可靠性等三个方面。
随机应变——可裁剪性
从硬件环境来看，桌面操作系统具有标准化的、存储和I/O架构，而嵌入式环境中的RTOS的硬件环境只有标准化的，没有标准化的存储、I/O和显示器架构。
从应用环境来看，桌面操作系统面向复杂多变的应用，而RTOS面向单一设备的单一应用。
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