#include <event2/event.h>
/* Here's a callback function that calls loopbreak */
void cb(int sock, short what, void *arg)
{
struct event_base *base = arg;
event_base_loopbreak(base);
}
void main_loop(struct event_base *base, evutil_socket_t watchdog_fd)
{
struct event *watchdog_event;
/* Construct a new event to trigger whenever there are any bytes to
read from a watchdog socket. When that happens, we'll call the
cb function, which will make the loop exit immediately without
running any other active events at all.
*/
watchdog_event = event_new(base, watchdog_fd, EV_READ, cb, base);
event_add(watchdog_event, NULL);
event_base_dispatch(base);
}
实例2：执行事件循环10秒，然后退出
#include <event2/event.h>
void run_base_with_ticks(struct event_base *base)
{
struct timeval ten_sec;
ten_sec.tv_sec = 10;
ten_sec.tv_usec = 0;
/* Now we run the event_base for a series of 10-second intervals, printing
"Tick" after each. For a much better way to implement a 10-second
timer, see the section below about persistent timer events. */
while (1) {
/* This schedules an exit ten seconds from now. */
event_base_loopexit(base, &ten_sec);
event_base_dispatch(base);
puts("Tick");
}
}