Why should condition variable uses a mute together? what't functionality of it? Any detailed answer with examples will be greatly appreciated.
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                    Did you try searching for basic, existing information on the internet, like [the article on Wikipedia](http://en.wikipedia.org/wiki/Condition_variable#Condition_variables)? Which part of it is unclear? – Kerrek SB Nov 18 '13 at 09:03
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                    https://computing.llnl.gov/tutorials/pthreads/#ConVarSignal – Sergey Kalinichenko Nov 18 '13 at 09:04
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                    I googled around, and found some article about that, But I'am confused. – Bruce Yang Nov 18 '13 at 09:05
