1Why are manhole covers round?
2What is the difference between a mutex and a semaphore?
Which one would you use to protect access to an increment operation?
3A man pushed his car to a hotel and lost his fortune. What happened?
4Explain the significance of “dead beef”.
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http://blog.csdn.net/wangshubo1989/article/details/49593907
http://blog.csdn.net/wangshubo1989/article/details/49593907