Predicting program execution times by analyzing static and dynamic program paths
Real-Time Systems - Special issue: Real-time languages and language-level timing tools and analysis
An extendible approach for analyzing fixed priority hard real-time tasks
Real-Time Systems
POSIX.4: programming for the real world
POSIX.4: programming for the real world
Programming with POSIX threads
Programming with POSIX threads
A Multiframe Model for Real-Time Tasks
IEEE Transactions on Software Engineering
Scheduling Algorithms for Multiprogramming in a Hard-Real-Time Environment
Journal of the ACM (JACM)
Priority Inheritance Protocols: An Approach to Real-Time Synchronization
IEEE Transactions on Computers
Improved response time analysis of tasks scheduled under preemptive Round-Robin
CODES+ISSS '07 Proceedings of the 5th IEEE/ACM international conference on Hardware/software codesign and system synthesis
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The analysis of fixed priority preemptive scheduling has been extended in various ways to improve its usefulness for the design of real-time systems. In this paper, we define the layered preemptive priority scheduling policy which generalizes fixed preemptive priorities by combination with other policies in a layered structure. In particular, the combination with the Round Robin scheduling policy is studied. Its compliance with Posix 1003.1b requirements is shown and its timing analysis is provided. For this purpose and as a basis for the analysis of other policies, the concept of majorizing work arrival function, is introduced to synthesize essential ideas used in existing analysis of the fixed preemptive priority policy.If critical resources are protected by semaphores, the Priority Ceiling Protocol (PCP) can be used under fixed preemptive priorities to control resulting priority inversions. An extension of the PCP is proposed for Round Robin, to allow a global control of priority inversions under the layered priority policy and to prevent deadlocks. The initial timing analysis is extended to account for the effects of the protocol. The results are illustrated by a small test case.