如何将timeval设置为随机时间

Question

我使用libevent在一些超时后执行某些任务，随机选择超时，每次更改时。问题是我无法将timeval变量设置为随机时间。

int TIMEOUT = 2000000; // 2 millions micro seconds, which is 2 seconds
int mytimeout = (rand() % TIMEOUT) + 1; // a random time between 0 and 2 seconds
int mysec = mytime/1000000; // the number of seconds
int myMicroSec = mytime -  mysec * 1000000; // the number of micro seconds
static struct timeval poll_interval_tv = {mysec, myMicroSec};

myevent = event_new(libevent_get_base(), -1,EV_TIMEOUT,
                        mycallback_function, arg);

它会返回以下错误： 错误：初始化元素不是常量 错误:(接近初始化'poll_interval_tv.tv_sec'）