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

fetish

bug就是高优先级任务就续却进不去，在os_core.c里面
void  OSIntExit (void)
void  OSSched (void)
两个函数中：OSTCBHighRdy  = OSTCBPrioTbl[OSPrioHighRdy];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[OSPrioHighRdy];
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？