Evaluation of new POSIX real-time operating systems services for small embedded platforms

• Published in: 15th Euromicro Conference on Real-Time Systems, 2003. Proceedings pp. 161 - 168
• Main Authors: Rivas, M.A., Harbour, M.G.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 2003
• Subjects: Application software; Clocks; Embedded system; IEC standards; ISO standards; Kernel; Memory management; Operating systems; Real time systems; Standards development
• ISBN: 0769519369; 9780769519364
• DOI: 10.1109/EMRTS.2003.1212739

The ongoing revision of the POSIX.13 standard - real-time profiles for portable operating system interfaces - proposes adding services to the minimum real-time system profile that are considered useful to the small embedded applications to which this profile is targeted. Concerns have been raised that these services may introduce too much overhead or may be difficult to implement. In this paper, we evaluate the implementation of some of these services in our MaRTE operating system. The implemented services are the monotonic clock, a high resolution sleep operation with specifiable clock, execution-time clock and timers, the sporadic server scheduling policy, and the timed mutex lock operation. We show that the complexity of these implementations is small, and the overheads introduced by the new services are fully acceptable.