基于μCLinux的操作系统实时性扩展和应用  

Extension and Application of the Operating System Real-Timeness Based on μCLinux

作　　者：苏曙光[1] 曹华[1] 刘云生[1] 

机构地区：[1]华中科技大学软件学院,湖北武汉430074

出　　处：《计算机工程与科学》2010年第4期125-127,138,共4页Computer Engineering & Science

基　　金：湖北省自然科学基金资助项目(2007ABA311)

摘　　要：本文提出一种基于实时硬件抽象层RTHAL的方法增强μCLinux实时性能以便应用于实时视频编码系统。具有硬实时性能的RTHAL运行于硬件层和μCLinux之间,通过尽可能少地修改μCLinux内核而获得完全的硬实时性能,平均任务调度延迟仅为3～4μs左右。本文还提出了如何计算和设置RTHAL和μCLinux之间FIFO缓冲区的大小以便实现实时数据稳定传输的方法。通过实时视频编码实例测试表明,该方法能够简单高效地提高μCLinux的实时性能。The paper proposes an implementation of the real-time μCLinux based on RTHAL（Real Time Hardware Abstract Layer）. RTHAL with hard real-timeness runs between hardware and μCLinux, and only with a few modifications μCLinux can have harder real-timeness with a scheduling delay of about 3μs. The paper further proposes an effective method to calculate the size of the FIFO buffer for transferring real-time data stably between RTHAL and μCLinux. An example of real-time video coding proves the method can provide μCLinux with good real-timeness easily and effectively.

关 键 词：实时硬件抽象层 实时性μCLinux 实时视频编码 

分 类 号：TP316[自动化与计算机技术—计算机软件与理论]