发现UC/OS2.86的bug，修改了以后产生一个很奇怪的疑问，为什么这个bug只在Cortex-M3内核
bug就是高优先级任务就续却进不去，在os_core.c里面voidOSIntExit (void)
voidOSSched (void)
两个函数中：OSTCBHighRdy= OSTCBPrioTbl;这一句往前提一行就行。
在ReleaseNote.pdf有这么一句：
CHANGES TO V2.87
You should follow these steps in order to upgrade from a previous version to V2.87.
1) OS_CORE.C:
OSIntExit() and OS_Sched() have changed slightly because of a boundary condition found with the Cortex-M3 port. Specifically, we needed to move the statement:
OSTCBHighRdy = OSTCBPrioTbl;
Before testing for the priority.
也就是说这个bug只有Cortex-M3才有，太神奇了。
谁知道是什么原因导致的？
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