其中:ull 是C语言的数值字面量,是显式表明类型时使用的字符串(表示 ”unsigned long long “) 点进宏定义 USEC_PER_SEC :看到很多宏定义,在网上找了一下,感觉解释的怪怪的。索性自己解释一番 SEC 秒 PER 每 NSEC 纳秒 MSEC 毫秒 USEC 微秒 #defineNSEC_PER_SEC 1000000000ull 多少纳秒 = 1秒 1秒 = 10...
aRemain connected to the system for a period of at least 300msec when the rate of change in the system frequency rises to above 0.5 Hz per second, and for a period of at least 100msec when the rate of change in the system frequency rises to above 1 Hz per second. 保持连接到系统...