Abstract
Multi-core processors can provide high performance to complex multi-task real-time control systems such as CNC system, but most real-time kernels do not support multi-core processors very well, which couldn't utilize the advantages of multi-core processors. To enlarge the CPU utilization and promote the system real-time performance of multi-core processor based CNC systems, a demand based real-time scheduling strategy for SMP processors is proposed. Hard real-time cyclic tasks in the CNC system are triggered by hardware timer periodically, which makes it possible to realize shorter task cycle than traditional time tick triggering method. Soft real-time tasks are scheduled according to the real-time system demand in a First-Come, First-Served manner. To evaluate the functionality of the developed real-time kernel, a prototype CNC system is developed, and the buffer status monitoring results have shown the feasibility and validity of the proposed scheduling strategy.
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