gettimeofday获取微妙

 

 

struct timeval {
time_t tv_sec; /* seconds */
suseconds_t tv_usec; /* microseconds */
};
millisecond 毫秒
microsecond 微秒
timeval表示一个时间点，比如:
timeval.tv_sec = 1 (s)
timevat.tv_usec = 500 000 (μs)