嵌入式系统概述完整版教学课件汇总.pptVIP

* Before you begin: Before taking this course, it’s recommended that students view the following training presentations: “SharePoint document libraries I: Introduction to sharing files,” or be able to add and edit files in a SharePoint library. “SharePoint document libraries II: All about checkout,” or be able to check out, edit, and check in files. “SharePoint document libraries III: Work with document versions,” or be able to open and restore previous versions. “SharePoint document libraries IV: Tips and tricks,” or be able to check in a file by using the Server menu, available by clicking the Microsoft Office Button. Students must also know how to navigate around Microsoft Office Outlook? 2007 and know how to move messages and open them. [Notes to trainer: For detailed help in customizing this template, see the very last slide. Also, look for additional lesson text in the notes pane of some slides. Macromedia Flash animations: This template contains Flash animations. These will play in PowerPoint 2000 and later. However: If you want to save this template in PowerPoint 2007, save it in the earlier PowerPoint file format: PowerPoint 97-2003 Presentation (*.ppt) or PowerPoint 97-2003 Template (*.pot) (you’ll see the file types in the Save As dialog box, next to Save as type). Warning: If you save it in a PowerPoint 2007 file format, such as PowerPoint Presentation (*.pptx) or PowerPoint Template (*.potx), the animations won’t be retained in the saved file. Also: Because this presentation contains Flash animations, saving the template may cause a warning message to appear regarding personal information. Unless you add information to the properties of the Flash file itself, this warning does not apply to this presentation. Click OK on the message.] * * * 中断的必要性 * 中断向量表 * 系统堆栈 非占先式内核 占先式内核 占先式内核 preemptive - 最高优先级的任务一旦就绪，总能得到CPU的控制权。 - 高优先级的就绪任务可以打断正在执行的较低优先级的任务，进入执行态；被抢占的较低优先级任务进入就绪任务队列，等待下一次调度。 - 商业上销售的实时内核都是抢占式内核。 占先式内核 可重入性 可重入性 reentrancy -可重