vxworks的实时性，一般任务实现机制包括分片与抢占调度相结合，还有一个重要的体现就是看门狗的作用；-real-time vxworks, general tasks, including the realization of the mechanism and seize piecewise combination of scheduling, there is a manifestation of an important watchdog role

Nano OS is a RTOS for Atmel AVR controllers. It provides: -preemptive realtime multitasking incl. priorities, -binary semaphores, -message queues, -array-based memory management , -functions for taskcontrol, -watchdog, -