http://blog.csdn.net/macmini/article/details/10503799
当我们使用
gettimeofday(&time, NULL);时，会出现这样一个WARNING
Implicit declaration of function 'gettimeofday' is invalid in C99
而经过搜索之后发现只需加入
#include <sys/time.h>
这个头文件即可
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