嵌入式OSEK/VDX操作系统的优化与应用

Optimizationand Application of Embedded OSEK/VDX Operating System

为了解决嵌入式OSEK/VDX操作系统在高负载、抢占模式下低优先级任务长时间得不到执行的问题,利用OSEK/VDX标准中的报警机制提出了一种优化的最小空闲时间优先调度算法来完善嵌入式OSEK/VDX操作系统的调度策略。给出了该算法的具体实现方案,在理论上分析了该算法的可行性,最后将该算法应用于汽车简单和复杂的电控系统。测试结果表明:在高负载、抢占模式下,使用该算法能够明显改善低优先级任务的执行。

For solving the problem that the low-priority tasks are hard to be executed under high load and preemption mode with embedded OSEK/VDX operating system, an optimized least slack first algorithm is proposed by utilizing the alarm mechanism of OSEK/VDX standard to improve the scheduling strategy of embedded OSEK/ VDX operating system. The specific implementation scheme of the algorithm is presented, its feasibility is theoreti- cally analyzed, and finally the algorithm is applied to both simple and complex electric control systems of vehicle. The results of test show that the algorithm proposed can significantly improve the excitation of low-priority tasks un- der the condition of high load and preemption mode.