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This study introduces a computer-aided programming method for concurrency, automatically inserting synchronization to ensure correctness. The approach simplifies programming by assuming a non-preemptive scheduler, proving effective in device-driver development.

Keywords:
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Area of Science:

  • Computer Science
  • Software Engineering
  • Concurrent Systems

Background:

  • Programming concurrent systems is complex due to preemptive schedulers.
  • Existing methods often require explicit, user-defined correctness specifications.
  • Implicit specifications derived from non-preemptive behavior offer a potential simplification.

Purpose of the Study:

  • To develop a computer-aided programming approach for concurrency.
  • To automatically synthesize synchronization to ensure correctness under preemptive scheduling.
  • To infer implicit correctness specifications from non-preemptive execution.

Main Methods:

  • Programmers assume a non-preemptive scheduler; synthesis procedure adds synchronization.
  • Utilizes finitary abstraction and bounded language inclusion modulo an independence relation.
  • Generates global constraints for synchronization placement, selecting optimal solutions.

Main Results:

  • The synthesis guarantees no deadlocks and optimal synchronization insertion.
  • Applied to device-driver programming, the method proved precise and efficient.
  • Identified a concurrency bug missed by explicit specification model-checking.

Conclusions:

  • The computer-aided approach effectively handles concurrency by inferring implicit specifications.
  • It simplifies concurrent programming and improves bug detection.
  • Optimized synchronization placements can be achieved for different objectives (e.g., minimal operations vs. maximum concurrency).