diff --git a/README.md b/README.md
index 85bb2fa..21bfc37 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,4 @@
 state-threads
-=============
 
 Fork from http://sourceforge.net/projects/state-threads, patched for [SRS](https://github.com/ossrs/srs/tree/2.0release).
 
diff --git a/common.h b/common.h
index 0c0685b..7fb6029 100644
--- a/common.h
+++ b/common.h
@@ -228,6 +228,8 @@ typedef struct _st_eventsys_ops {
     int  (*fd_new)(int);                       /* New descriptor allocated */
     int  (*fd_close)(int);                     /* Descriptor closed */
     int  (*fd_getlimit)(void);                 /* Descriptor hard limit */
+    int  (*pollq_add)(_st_pollq_t *pq);
+    void (*pollq_del)(_st_pollq_t *pq);
 } _st_eventsys_t;
 
 
diff --git a/event.c b/event.c
index 142882a..70caa27 100644
--- a/event.c
+++ b/event.c
@@ -119,6 +119,12 @@ typedef struct _epoll_fd_data {
     int wr_ref_cnt;
     int ex_ref_cnt;
     int revents;
+    /* The following members aren't touched after forking. */
+    union {
+        _st_pollq_t *pq;
+        _st_pollq_t **pqs;
+    };
+    int pq_cnt;
 } _epoll_fd_data_t;
 
 static struct _st_epolldata {
@@ -1194,6 +1200,85 @@ ST_HIDDEN int _st_epoll_pollset_add(struct pollfd *pds, int npds)
     return 0;
 }
 
+ST_HIDDEN void _st_epoll_pollq_del(_st_pollq_t *pq)
+{
+    struct pollfd *pd = pq->pds;
+    struct pollfd *pd_end = pd + pq->npds;
+    _epoll_fd_data_t *efd;
+    int i;
+
+    while (pd < pd_end) {
+        efd = &_st_epoll_data->fd_data[pd->fd];
+        if (efd->pq_cnt == 1) {
+            if (efd->pq == pq)
+                efd->pq = NULL;
+        } else if (efd->pq_cnt > 0) {
+            for (i = 0; i < efd->pq_cnt; ++i) {
+                if (efd->pqs[i] == pq) {
+                    efd->pqs[i] = NULL;
+                    break;
+                }
+            }
+        }
+        ++pd;
+    }
+}
+
+ST_HIDDEN int _st_epoll_pollq_add(_st_pollq_t *pq)
+{
+    struct pollfd *pd = pq->pds;
+    struct pollfd *pd_end = pd + pq->npds;
+    _epoll_fd_data_t *efd;
+    int i;
+    _st_pollq_t **pqs;
+
+    while (pd < pd_end) {
+        efd = &_st_epoll_data->fd_data[pd->fd];
+        if (efd->pq_cnt == 0) {
+            efd->pq = pq;
+            efd->pq_cnt = 1;
+        } else if (efd->pq_cnt == 1) {
+            if (efd->pq == NULL) {
+                efd->pq = pq;
+            } else {
+                assert(efd->pq != pq);
+                pqs = malloc(sizeof(*pqs) * 2);
+                if (!pqs) {
+                    _st_epoll_pollq_del(pq);
+                    errno = ENOMEM;
+                    return -1;
+                }
+                pqs[0] = efd->pq;
+                pqs[1] = pq;
+                efd->pqs = pqs;
+                efd->pq_cnt = 2;
+            }
+        } else {
+            for (i = 0; i < efd->pq_cnt; ++i) {
+                if (efd->pqs[i] == NULL) {
+                    efd->pqs[i] = pq;
+                    break;
+                } else {
+                    assert(efd->pqs[i] != pq);
+                }
+            }
+            if (i == efd->pq_cnt) {
+                pqs = realloc(efd->pqs, sizeof(*pqs) * (efd->pq_cnt + 1));
+                if (!pqs) {
+                    _st_epoll_pollq_del(pq);
+                    errno = ENOMEM;
+                    return -1;
+                }
+                efd->pqs = pqs;
+                efd->pqs[efd->pq_cnt++] = pq;
+            }
+        }
+        ++pd;
+    }
+
+    return 0;
+}
+
 ST_HIDDEN void _st_epoll_dispatch(void)
 {
     st_utime_t min_timeout;
@@ -1201,9 +1286,11 @@ ST_HIDDEN void _st_epoll_dispatch(void)
     _st_pollq_t *pq;
     struct pollfd *pds, *epds;
     struct epoll_event ev;
-    int timeout, nfd, i, osfd, notify;
+    int timeout, nfd, i, j, osfd, notify;
     int events, op;
     short revents;
+    _epoll_fd_data_t *efd;
+    _st_pollq_t **pqs;
 
     if (_ST_SLEEPQ == NULL) {
         timeout = -1;
@@ -1224,7 +1311,10 @@ ST_HIDDEN void _st_epoll_dispatch(void)
         _st_epoll_data->pid = getpid();
 
         /* Put all descriptors on ioq into new epoll set */
-        memset(_st_epoll_data->fd_data, 0, _st_epoll_data->fd_data_size * sizeof(_epoll_fd_data_t));
+        for (i = 0; i < _st_epoll_data->fd_data_size; ++i) {
+            memset(&_st_epoll_data->fd_data[i], 0,
+                   offsetof(_epoll_fd_data_t, pq));
+        }
         _st_epoll_data->evtlist_cnt = 0;
         for (q = _ST_IOQ.next; q != &_ST_IOQ; q = q->next) {
             pq = _ST_POLLQUEUE_PTR(q);
@@ -1245,48 +1335,63 @@ ST_HIDDEN void _st_epoll_dispatch(void)
             }
         }
 
-        for (q = _ST_IOQ.next; q != &_ST_IOQ; q = q->next) {
-            pq = _ST_POLLQUEUE_PTR(q);
-            notify = 0;
-            epds = pq->pds + pq->npds;
-
-            for (pds = pq->pds; pds < epds; pds++) {
-                if (_ST_EPOLL_REVENTS(pds->fd) == 0) {
-                    pds->revents = 0;
+        for (i = 0; i < nfd; ++i) {
+            osfd = _st_epoll_data->evtlist[i].data.fd;
+            efd = &_st_epoll_data->fd_data[osfd];
+            assert(efd->pq_cnt > 0);
+            if (efd->pq_cnt == 1)
+                pqs = &efd->pq;
+            else
+                pqs = efd->pqs;
+            for (j = 0; j < efd->pq_cnt; ++j) {
+                pq = pqs[j];
+                if (!pq)
                     continue;
-                }
-                osfd = pds->fd;
-                events = pds->events;
-                revents = 0;
-                if ((events & POLLIN) && (_ST_EPOLL_REVENTS(osfd) & EPOLLIN))
-                    revents |= POLLIN;
-                if ((events & POLLOUT) && (_ST_EPOLL_REVENTS(osfd) & EPOLLOUT))
-                    revents |= POLLOUT;
-                if ((events & POLLPRI) && (_ST_EPOLL_REVENTS(osfd) & EPOLLPRI))
-                    revents |= POLLPRI;
-                if (_ST_EPOLL_REVENTS(osfd) & EPOLLERR)
-                    revents |= POLLERR;
-                if (_ST_EPOLL_REVENTS(osfd) & EPOLLHUP)
-                    revents |= POLLHUP;
+                notify = 0;
+                epds = pq->pds + pq->npds;
 
-                pds->revents = revents;
-                if (revents) {
-                    notify = 1;
+                for (pds = pq->pds; pds < epds; pds++) {
+                    if (_ST_EPOLL_REVENTS(pds->fd) == 0) {
+                        pds->revents = 0;
+                        continue;
+                    }
+                    osfd = pds->fd;
+                    events = pds->events;
+                    revents = 0;
+                    if ((events & POLLIN) &&
+                        (_ST_EPOLL_REVENTS(osfd) & EPOLLIN))
+                        revents |= POLLIN;
+                    if ((events & POLLOUT) &&
+                        (_ST_EPOLL_REVENTS(osfd) & EPOLLOUT))
+                        revents |= POLLOUT;
+                    if ((events & POLLPRI) &&
+                        (_ST_EPOLL_REVENTS(osfd) & EPOLLPRI))
+                        revents |= POLLPRI;
+                    if (_ST_EPOLL_REVENTS(osfd) & EPOLLERR)
+                        revents |= POLLERR;
+                    if (_ST_EPOLL_REVENTS(osfd) & EPOLLHUP)
+                        revents |= POLLHUP;
+
+                    pds->revents = revents;
+                    if (revents) {
+                        notify = 1;
+                    }
                 }
-            }
-            if (notify) {
-                ST_REMOVE_LINK(&pq->links);
-                pq->on_ioq = 0;
-                /*
-                 * Here we will only delete/modify descriptors that
-                 * didn't fire (see comments in _st_epoll_pollset_del()).
-                 */
-                _st_epoll_pollset_del(pq->pds, pq->npds);
+                if (notify) {
+                    _st_epoll_pollq_del(pq);
+                    ST_REMOVE_LINK(&pq->links);
+                    pq->on_ioq = 0;
+                    /*
+                     * Here we will only delete/modify descriptors that
+                     * didn't fire (see comments in _st_epoll_pollset_del()).
+                     */
+                    _st_epoll_pollset_del(pq->pds, pq->npds);
 
-                if (pq->thread->flags & _ST_FL_ON_SLEEPQ)
-                    _ST_DEL_SLEEPQ(pq->thread);
-                pq->thread->state = _ST_ST_RUNNABLE;
-                _ST_ADD_RUNQ(pq->thread);
+                    if (pq->thread->flags & _ST_FL_ON_SLEEPQ)
+                        _ST_DEL_SLEEPQ(pq->thread);
+                    pq->thread->state = _ST_ST_RUNNABLE;
+                    _ST_ADD_RUNQ(pq->thread);
+                }
             }
         }
 
@@ -1353,7 +1458,9 @@ static _st_eventsys_t _st_epoll_eventsys = {
     _st_epoll_pollset_del,
     _st_epoll_fd_new,
     _st_epoll_fd_close,
-    _st_epoll_fd_getlimit
+    _st_epoll_fd_getlimit,
+    _st_epoll_pollq_add,
+    _st_epoll_pollq_del
 };
 #endif  /* MD_HAVE_EPOLL */
 
diff --git a/sched.c b/sched.c
index 8751582..9c6f52e 100644
--- a/sched.c
+++ b/sched.c
@@ -83,6 +83,8 @@ int st_poll(struct pollfd *pds, int npds, st_utime_t timeout)
     pq.npds = npds;
     pq.thread = me;
     pq.on_ioq = 1;
+    if (*_st_eventsys->pollq_add && (*_st_eventsys->pollq_add)(&pq))
+        return -1;
     _ST_ADD_IOQ(pq);
     if (timeout != ST_UTIME_NO_TIMEOUT)
         _ST_ADD_SLEEPQ(me, timeout);
@@ -92,6 +94,8 @@ int st_poll(struct pollfd *pds, int npds, st_utime_t timeout)
     
     n = 0;
     if (pq.on_ioq) {
+        if (*_st_eventsys->pollq_del)
+            (*_st_eventsys->pollq_del)(&pq);
         /* If we timed out, the pollq might still be on the ioq. Remove it */
         _ST_DEL_IOQ(pq);
         (*_st_eventsys->pollset_del)(pds, npds);