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Improvement on μC/OS-II Real-time System Task Scheduling

Liang Xu, XU Zhong-wei

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Abstract

Priority inversion is the most common problem occurring in real-time system when using a real-time kernel.In order to solve the problem,the operation system must dynamically hoist the task priority which occupies the resource.This paper analyses the task scheduling principle of μC/OS-II,and then proposes a method based on the priority inheritance and hoist,which solves the problem.It improves the task scheduling of the real-time system and strengthens its real-time performance for the high-priority task.

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What this paper is about

Priority inversion is the most common problem occurring in real-time system when using a real-time kernel.In order to solve the problem,the operation system must dynamically hoist the task priority which occupies the resource.This paper analyses the task scheduling principle of μC/OS-II,and then proposes a method based on the priority inheritance and hoist,which solves the problem.It improves the task scheduling of the real-time system and strengthens its real-time performance for the high-priority task.

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Available abstract

Priority inversion is the most common problem occurring in real-time system when using a real-time kernel.In order to solve the problem,the operation system must dynamically hoist the task priority which occupies the resource.This paper analyses the task scheduling principle of μC/OS-II,and then proposes a method based on the priority inheritance and hoist,which solves the problem.It improves the task scheduling of the real-time system and strengthens its real-time performance for the high-priority task.

Key concepts: Computer science, Priority inversion, Real-time operating system, Scheduling (production processes), Real-time computing, Earliest deadline first scheduling, Hoist (device), Deadline-monotonic scheduling

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