μC/OS从1992年开始为人们熟悉，到现在已经发展为μC/OS-II。ΜC/OS-II最多支持56个任务，其内核为占先式，总是执行就绪态的优先级最高的任务，并支持Semaphore（信号量）、Mailbox（邮箱）、Message Queue(消息队列)等多种常用的进程间通信机制。与大多商用RTOS不同的是，μC/OS-II公开所有的源代码，并可以免费获得，对商业应用收取少量License费用。-μC/OS since 1992 to people familiar with until now has been developed for μC/OS-II. ΜC/OS-II supports up to 56 tasks, the kernel for Preemptive always ready state to implement the highest priority tasks, and to support the Semaphore (Semaphore), Mailbox (mail), Message Queue (Message Queue), etc. a wide range of commonly used interprocess communication mechanism. Most of the commercial RTOS and the difference is, μC/OS-II open all the source code, and can be obtained free of charge a small business applications License fees.