库纳尔和霍洛维茨报告说，那些使用免提电话之类的人，他们的平均反应时间比不使用免提电话的人慢212毫秒。

As Kunar and Horowitz report, those who were making the equivalent of a hands-free call had an average reaction time 212 milliseconds slower than those who were not.

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不使用互斥对象时，即使主线程在thread_function线程睡眠一秒钟期间内对myglobal加一，thread_function苏醒后也会覆盖主线程所加的值。

Without the mutex, thread_function will overwrite the incremented value when it wakes up if our main thread increments myglobal during thread_function 's one-second nap.

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