Abstract. The purpose of this paper is to propose a budget-based RTAI (Real-Time Application Interface) implementation for real-time tasks over Linux on x86 architectures. Different from the past work, we focus on extending RTAI API's such that programmers could specify a computation budget for each task, and the backward compatibility is maintained. Modifications on RTAI are limited to few procedures without any change to Linux kernel. The feasibility of the proposed implementation is demonstrated by a system over Linux 2.4.0-test10 and RTAI 24.1.2 on PII and PIII platforms.
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