Abstract: Scheduling strategy is kernel of one operating system，and directly impacts the performance of operating system.OSEK-based operating system is strict with the real-time performance.Through analyzing the preemptive scheduling strategy and task’s attribute of OSEK OS criterion，this paper presents a conversion strategy from task to function，which makes task execution like a function call，to reduce the task swapping time of the process of task execution，and to improve the task response performance and operating system real-time performance.The strategy’s validation is verified by experiments.

摘要： 调度是操作系统的核心，调度策略的优劣直接影响到操作系统工作性能。基于OSEK的操作系统对实时性要求非常严格，通过分析OSEK抢占式调度策略和任务的属性，提出一种任务和函数之间的转换策略，使任务执行在一定条件下可以转换为函数调用，减少任务执行过程中的切换时间，从而提高任务响应速度和操作系统实时性。通过实验验证，该改进策略是有效的。