对预发布的新应用软件的构造进行组件、功能以及系统测试。
Component, functional, and system testing on pre-release builds of the new application.
本节将介绍几个系统调用的构造，从而展示它们的实现和用户空间应用程序对它们的使用。
This section walks through the construction of a few system calls to demonstrate their implementation and use by a user-space application.
要使用多处理器系统的功能，通常需要使用多线程构造应用程序。
To exploit the power of multiprocessor systems, applications are generally structured using multiple threads.
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