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Special Report

The Priority Ceiling Protocol: A Method for Minimizing the Blocking of High-Priority ADA Tasks

  • March 1988
  • By John B. Goodenough, Lui R. Sha
  • The priority ceiling protocol is a new technique that addresses the priority inversion problem. Under the priority ceiling protocol, a high priority task can be blocked at most once by a lower priority task.
  • Performance and Dependability
  • Publisher: Software Engineering Institute
    CMU/SEI Report Number: CMU/SEI-88-SR-004
  • Abstract

    The priority ceiling protocol is a new technique that addresses the priority inversion problem, i.e., the possibility that a high-priority task can be delayed by a low-priority task. Under the priority ceiling protocol, a high priority task can be blocked at most once by a lower priority task. This paper defines how to apply the protocol to ADA. In particular, restrictions on the use of task priorities in ADA are defined as well as restrictions on the use of ADA tasking constructs. An extensive example illustrating the behavior guaranteed by the protocol is given. 

    This paper was presented at the 2nd International Workshop on Real-Time ADA Issues in May 1988.

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