说明：  My first book, “μC/OS, The Real-Time Kernel” is now 6 years old and the publisher has sold well over 15,000 copies around the world. When I was asked to do a second edition, I thought it would be a fairly straightforward task a few corrections here and there, clarify a few concepts, add a function or two to the kernel, etc. If you have a copy of the first edition, you will notice that “μC/OS-II, The Real-Time Kernel” is in fact a major revision. For some strange reason, I wasn’t satisfied with minor corrections. Also, when my publisher told me that this time, the book would be a ‘hard cover’, I really wanted to give you your moneys worth. In all, I added more than 200 new pages, and re-wrote the majority of the pages I did keep. I added a porting guide to help you port μC/OS-II to the processor of your choice. Also, I added a chapter that will guide you through upgrading a μC/OS port to μC/OS-II.