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RTL-IO: An Extension of RTLinux I/O


School of Computer, Beijing University of Aeronautics and Astronautics
No. 37, XueYuan Road, HaiDian District, Beijing City, China
wanglei@buaa.edu.cn
yangchen buaa@sina.com
wangxin@buaa.edu.cn


As Linux becomes more and more popular in many fields of science and industry, RTLinux is also widely used. But RTLinux only provides basic services -- it does not support dynamic memory management, and its I/O support is not good enough either. However, there is a facility called "RTFIFO" in RTLinux. But this method is inconvenient because developers have to provide a user space program for every real-time thread.

In this paper, we studied dynamic memory-management algorithms, and implemented the dynamic memory management module based on the TLSF algorithm in RTLinux. Then we analyzed I/O mechanism used in RTLinux and designed a new I/O mechanism, RTL-IO. We have already used RTL-IO into Cyber data acquisition simulation system.

This paper was originally presented at the Eighth Real-Time Linux Workshop held at the at the School for Information Science and Engineering, Lanzhou University, in Lanzhou, China.

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