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libevent-1.4.12-stable, libevent-2.0.4-alpha

libevent µÄĬÈÏֻʵÏÖÁË once timer£¬Èç¹ûÆÚÍû periodic timer£¬»¹µÄ×Ô¼º´¦ÀíÏ¡£ÕâµãʵÏֵò»ºÃ£¬Ó¦¸ÃÖ§³Ö periodic timer µÄ¡£

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#include <sys/time.h>   // struct timeval
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <event.h>

void once_timer(int fd, short events, void *arg)
{
    printf("once timer = %d\n", time(NULL));
    free(arg);  // free ev
}

void init_once_timer()
{
    struct event *ev;
    struct timeval tv = { 3, 0 };

    ev = malloc(sizeof(struct event));
    evtimer_set(ev, once_timer, (void *)ev);
    evtimer_add(ev, &tv);
}

struct my_param {
    struct event ev;
    struct timeval tv;
};

void periodic_timer(int fd, short events, void *arg)
{
    struct my_param *p = (struct my_param *)arg;
    event_add(&p->ev, &p->tv);
    printf("periodic timer = %d\n", time(NULL));
}

void init_periodic_timer()
{
    struct my_param *p;
    p = malloc(sizeof(struct my_param));
    p->tv.tv_sec  = 3;
    p->tv.tv_usec = 0;
    evtimer_set(&p->ev, periodic_timer, (void *)p);
    evtimer_add(&p->ev, &p->tv);
}

int main()
{
    event_init();
    init_once_timer();
    init_periodic_timer();
    event_dispatch();
    return 0;
}
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$ ./a.out
once timer = 1264252894
periodic timer = 1264252894
periodic timer = 1264252897
periodic timer = 1264252900
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