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【正文】 B=8 B=4 B=2 B=4 B=2（2）T1T2T3A=16B=16（3） T1 T2 T3XLOCK A XLOCK B WAIT讀A=0 讀B=0 WAITA=A+2 B=B*2WRITE A=2 WRITE B=0UNLOCK A UNLOCK B WAITXLOCL B XLOCKA讀B=0 讀A=2B=B+2 A=A*2 waitWRITE B=2 WRITE A=4UNLOCK B UNLOCL A XLOCK A讀A=4A=A**WRITE A=16UNLOCK AXLOCL B讀B=2B=B**2WRITE B=4UNLOCK B非串行化調(diào)度A=16 B=4（4）T1 T2 T3XLOCK A WAIT WAIT讀A=0 WAIT WAIT。 WAIT WAITUNLOCK A WAIT WAITUNLOCK B XLOCK A WAIT讀A=0 WAIT。 WAITUNLOCK A XLOCK AUNLOCK B WAIT讀A=0。UNLOCK AUNLOCK B（5） T1 T2 T3XLOCK A XLOCK B WAIT讀A=0 讀B=0 WAITA=A+2 B=B*2 WAITWRITE A=2 WRITE B=0 WAITXLOCL B XLOCKA WAIT遵守兩段鎖協(xié)議死鎖情況
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