Lesson 27 Choosing a Real-Time Operating System.ppt

《电子信息工程专业英语教程》 Unit 9 Embedded application Lesson 27 Choosing a Real-Time Operating System 《电子信息工程专业英语教程》任治刚 主编 电子工业出版社 Lesson 27 Choosing a Real-Time Operating System Terminology protocol　 草案，协议，规程 debugger 调试器 kernel　 内核，内核程序 Stack 堆栈　　 Terminology system call　 系统调用 source code　　　 源代码，源程序 integrated development tool 集成开发工具 Terminology cross compiler　　　 交叉编译程序 device driver　 设备驱动程序 interrupt latency　　　 中断等待时间 The term real time means … Deadline for embedded systems … The designers of real-time embedded systems … Worst-case performance Vocabulary Suffice execution source Structure Reading/writing techniques To meet present needs or requirements; be sufficient: 满足；充足 These rations will suffice until next week. To be equal to a specified task; be capable: 有能力胜任；有能力 No words will suffice to convey my grief. Average or expected-case analysis simply will not suffice. 仅仅进行平均情况分析或期望情况分析是不够的。 suffice for 满足, 足够 suffice it to say that... 只要说....就够了 The act of executing something. 执行，完成 The state of being executed. 执行 The manner, style, or result of performance: 技巧，手法, 结果 The plan was sound; its execution, faulty. The act or an instance of putting to death or being put to death as a lawful penalty. 处决 An operating system is said to be deterministic if the worst-case execution time of each of its system calls is calculable. 如果每个系统调用在最坏情况下的执行时间都是可计算的，那么这个操作系统就是确定性的。 program execution 程序执行 step execution 逐步执行 execution of contract 履行合同, 契约生效 The point at which something springs into being or from which it derives or is obtained. 来源 The point of origin, such as a spring, of a stream or river. 源头 One that causes, creates, or initiates; a maker. 发起者；创始者 One, such as a person or document, that supplies information: 消息来源 The point or part of a system where energy or mass is added to the system. 源 Those at the lower end of the spectrum offer just a basic preemptive scheduler and a few other key system calls. These operating systems are usually ine