使用 libevent 实现定时器（timer）
#include <event.h>#include <stdio.h>#include <time.h>static voidhello(int fd, short event, void *arg){ printf("hello man\n");}int main(int argc, const char *argv[]) { struct event_base *base; struct timeval tm; struct event evt; evutil_timerclear(&tm); tm.tv_sec = 10; base = event_base_new(); //evtimer_set(&evt, hello, NULL); event_set(&evt, -1, EV_PERSIST, hello, NULL); event_base_set(base, &evt); evtimer_add(&evt, &tm); event_base_loop(base, 0); return 0;}