DOpE — a Window Server for Real-Time and Embedded Systems — Extended Abstract —.pdf

Proceedings of the 24th IEEE International Real-Time Systems Symposium, Cancun, Mexico, December 2003 1 DOpE — a Window Server for Real-Time and Embedded Systems — Extended Abstract — Norman Feske and Hermann Härtig Technische Universität Dresden Department of Computer Science {nf2,haertig}@os.tu-dresden.de Abstract A window server used in real-time applications should be able to assure previously agreed-upon redrawing rates X-Window System for a subset of windows while providing best-effort services to the remaining windows and operations such as mov- ing windows. A window server used in embedded systems real-time should be small and require only minimal operating sys- application tem support, for example just threads and address spaces non-real-time as provided by microkernels. L4Linux In this paper, we present the design and an implementa- tion of the DOpE window server. The key techniques used are to move redrawing responsibility from client applica- DOpE tions to the window server and to devise a simple schedul- window ing discipline for the redrawing subtasks.