基于RTHAL的Linux实时性研究和实现  

Research and Implement of Realtime of Linux Based on RTHAL

作　　者：苏曙光[1] 刘云生[1] 

机构地区：[1]华中科技大学软件学院,武汉430074

出　　处：《计算机科学》2009年第7期270-272,共3页Computer Science

基　　金：湖北省自科基金项目:低码率视频编码动态行为建模(2007ABA311)资助

摘　　要：研究嵌入式Linux操作系统实时性的扩展和实现。提出通过在底层硬件和操作系统之间增加实时硬件抽象层的方式来扩充和增强Linux实时性能。该方法对操作系统内核只需做微小修改,就能达到既保持Linux现有功能和资源又兼有硬实时能力,其进程切换延迟仅为3微秒左右。讨论了对Linux和实时硬件抽象层两方面的扩展过程,同时还提出了如何有效利用两者间的缓冲区的方法。最后在嵌入式MPEG4流媒体系统中应用和测试了该方法,结果表明该方法实时性能优异,使用简单有效。The paper focused on research and implement of realtime of Linux. The paper proposed a method taking advantage of RTHAL（Real Time Hardware Abstract Layer）, which run between hardware and Linux. The method made only a few of modification on Linux and had a schedule delay of only about 3μs. The paper discussed how to modify Linux and RTHAL for hard realtime. In addition the paper proposed an effective method to take advantage of buffer between them. Lastly an example of realtime MPEG4 stream system was cited, which applied the method and proved it could add to hard realtime of Linux effectively and concisely.

关 键 词：实时硬件抽象层 实时性 LINUX 实时视频编码 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]