Case -based simulation approach aims to help students complete the content of classroom teaching by simulating the cases happened around them by using their own behaviors. Students are required to propose problems to discuss and analyze. The problem of ＂Writer Priority＂ in the operating system was carried out as follow. The application of the case - based simulation approach succeeds in discussing, designing and completing the synchronous process of writer priority through students＂ simulation on the actions of reader and writer.%案例模拟教学法是学生通过自身的行为模拟身边发生的事例来完成课堂的教学内容，让学生提出问题进行讨论，分析。就操作系统中“读者和写者”中的“写者优先”问题，运用案例模拟教学法通过学生模拟读者和写者动作，分析、设计并完成了写者优先的进程同步过程。
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