diff --git a/lib_fiber/c/Makefile b/lib_fiber/c/Makefile
index b8c5f5f63..ad22fed94 100644
--- a/lib_fiber/c/Makefile
+++ b/lib_fiber/c/Makefile
@@ -21,9 +21,9 @@ CFLAGS = -c -g -W \
 -Wcast-qual \
 -DUSE_FAST_RING \
 -DUSE_JMP_DEF \
+#-DUSE_FAST_TIME \
 #-DUSE_VALGRIND \
 #-DUSE_BOOST_JMP \
-#-DUSE_FAST_TIME \
 #-Waggregate-return \
 #-DDEBUG_MEM \
 #-I/usr/local/include
diff --git a/lib_fiber/c/src/event.c b/lib_fiber/c/src/event.c
index 716be58f9..e70d4ce2d 100644
--- a/lib_fiber/c/src/event.c
+++ b/lib_fiber/c/src/event.c
@@ -67,6 +67,7 @@ EVENT *event_create(int size)
 	ev->maxfd   = -1;
 	ev->waiter  = 0;
 
+	SET_TIME(ev->stamp);  // init the event's stamp when create each event
 #ifdef HAS_POLL
 	ring_init(&ev->poll_list);
 #endif
@@ -97,6 +98,17 @@ void event_free(EVENT *ev)
 	ev->free(ev);
 }
 
+long long event_set_stamp(EVENT *ev)
+{
+	SET_TIME(ev->stamp);  // decrease the SET_TIME's calling count.
+	return ev->stamp;
+}
+
+long long event_get_stamp(EVENT *ev)
+{
+	return ev->stamp;
+}
+
 #ifdef SYS_WIN
 int event_checkfd(EVENT *ev, FILE_EVENT *fe)
 {
@@ -374,6 +386,7 @@ static void event_prepare(EVENT *ev)
 #ifdef HAS_POLL
 static void event_process_poll(EVENT *ev)
 {
+#if 0
 	while (1) {
 		POLL_EVENT *pe;
 		RING *head = ring_pop_head(&ev->poll_list);
@@ -387,12 +400,32 @@ static void event_process_poll(EVENT *ev)
 	}
 
 	ring_init(&ev->poll_list);
+#else
+	POLL_EVENT *pe;
+	RING *next, *curr;
+	long long now;
+
+	now = event_get_stamp(ev);
+
+	for (next = ring_succ(&ev->poll_list); next != &ev->poll_list;) {
+		pe = ring_to_appl(next, POLL_EVENT, me);
+		if (pe->nready != 0 || (pe->expire >= 0 && now >= pe->expire)) {
+			curr = next;
+			next = ring_succ(next);
+			ring_detach(curr);
+			pe->proc(ev, pe);
+		} else {
+			next = ring_succ(next);
+		}
+	}
+#endif
 }
 #endif
 
 #ifdef	HAS_EPOLL
 static void event_process_epoll(EVENT *ev)
 {
+#if 0
 	while (1) {
 		EPOLL_EVENT *ee;
 		RING *head = ring_pop_head(&ev->epoll_list);
@@ -402,6 +435,25 @@ static void event_process_epoll(EVENT *ev)
 		ee = TO_APPL(head, EPOLL_EVENT, me);
 		ee->proc(ev, ee);
 	}
+#else
+	EPOLL_EVENT *ee;
+	RING *next, *curr;
+	long long now;
+
+	now = event_get_stamp(ev);
+
+	for (next = ring_succ(&ev->epoll_list); next != &ev->epoll_list;) {
+		ee = ring_to_appl(next, EPOLL_EVENT, me);
+		if (ee->nready != 0 || (ee->expire >= 0 && now >= ee->expire)) {
+			curr = next;
+			next = ring_succ(next);
+			ring_detach(curr);
+			ee->proc(ev, ee);
+		} else {
+			next = ring_succ(next);
+		}
+	}
+#endif
 }
 #endif
 
@@ -427,8 +479,12 @@ int event_process(EVENT *ev, int timeout)
 	}
 
 	event_prepare(ev);
+
+	// call the system event waiting API for any event arriving.
 	ret = ev->event_wait(ev, timeout);
 
+	(void) event_set_stamp(ev);  // reset the stamp after event waiting.
+
 #ifdef HAS_POLL
 	event_process_poll(ev);
 #endif
diff --git a/lib_fiber/c/src/event.h b/lib_fiber/c/src/event.h
index 457df92e8..7b35697b7 100644
--- a/lib_fiber/c/src/event.h
+++ b/lib_fiber/c/src/event.h
@@ -159,6 +159,7 @@ struct POLL_EVENT {
 	RING       me;
 	ACL_FIBER *fiber;
 	poll_proc *proc;
+	long long  expire;
 	int        nready;
 	int        nfds;
 	POLLFD    *fds;
@@ -181,6 +182,7 @@ struct EPOLL_EVENT {
 	ACL_FIBER  *fiber;
 	epoll_proc *proc;
 	size_t      nfds;
+	long long   expire;
 	EPOLL_CTX **fds;
 	int         epfd;
 
@@ -197,6 +199,7 @@ struct EVENT {
 	ssize_t  setsize;
 	socket_t maxfd;
 
+	long long stamp;  // the stamp of the current fiber scheduler
 	unsigned flag;
 #define EVENT_F_IOCP (1 << 0)
 #define EVENT_IS_IOCP(x) ((x)->flag & EVENT_F_IOCP)
@@ -237,6 +240,8 @@ acl_handle_t event_handle(EVENT *ev);
 ssize_t event_size(EVENT *ev);
 void event_free(EVENT *ev);
 void event_close(EVENT *ev, FILE_EVENT *fe);
+long long event_set_stamp(EVENT *ev);
+long long event_get_stamp(EVENT *ev);
 
 // check if the fd in fe is a valid socket, return 1 if yes, -1 if the fd
 // is not a valid fd, 0 if the fd is valid but not a socket.
diff --git a/lib_fiber/c/src/fiber_io.c b/lib_fiber/c/src/fiber_io.c
index 16bd9a072..3b571c435 100644
--- a/lib_fiber/c/src/fiber_io.c
+++ b/lib_fiber/c/src/fiber_io.c
@@ -14,7 +14,7 @@ typedef struct {
 	int        nsleeping;
 	int        io_stop;
 #ifdef SYS_WIN
-	HTABLE      *events;
+	HTABLE     *events;
 #else
 	FILE_EVENT **events;
 #endif
@@ -162,6 +162,12 @@ EVENT *fiber_io_event(void)
 	return __thread_fiber->event;
 }
 
+static long long fiber_io_stamp(void)
+{
+	EVENT *ev = fiber_io_event();
+	return event_get_stamp(ev);
+}
+
 static void fiber_io_loop(ACL_FIBER *self fiber_unused, void *ctx)
 {
 	EVENT *ev = (EVENT *) ctx;
@@ -177,7 +183,7 @@ static void fiber_io_loop(ACL_FIBER *self fiber_unused, void *ctx)
 		if (timer == NULL) {
 			left = -1;
 		} else {
-			SET_TIME(now);
+			now  = event_get_stamp(__thread_fiber->event);
 			last = now;
 			if (now >= timer->when) {
 				left = 0;
@@ -205,8 +211,7 @@ static void fiber_io_loop(ACL_FIBER *self fiber_unused, void *ctx)
 			break;
 		}
 
-		SET_TIME(now);
-
+		now = event_get_stamp(__thread_fiber->event);
 		if (now - last < left) {
 			continue;
 		}
@@ -220,7 +225,6 @@ static void fiber_io_loop(ACL_FIBER *self fiber_unused, void *ctx)
 
 			acl_fiber_ready(timer);
 			timer = FIRST_FIBER(&__thread_fiber->ev_timer);
-
 		} while (timer != NULL && now >= timer->when);
 	}
 
@@ -263,7 +267,7 @@ unsigned int acl_fiber_delay(unsigned int milliseconds)
 
 	ev = fiber_io_event();
 
-	SET_TIME(now);
+	now = event_get_stamp(ev);
 	when = now + milliseconds;
 
 	/* The timers in the ring were stored from small to large in ascending
@@ -309,7 +313,7 @@ unsigned int acl_fiber_delay(unsigned int milliseconds)
 		ev->timeout = -1;
 	}
 
-	SET_TIME(now);
+	now = event_get_stamp(ev);
 	if (now < when) {
 		return 0;
 	}
@@ -321,7 +325,7 @@ static void fiber_timer_callback(ACL_FIBER *fiber, void *ctx)
 {
 	long long now, left;
 
-	SET_TIME(now);
+	now = fiber_io_stamp();
 
 	for (;;) {
 		left = fiber->when > now ? fiber->when - now : 0;
@@ -331,7 +335,7 @@ static void fiber_timer_callback(ACL_FIBER *fiber, void *ctx)
 
 		acl_fiber_delay((unsigned int) left);
 
-		SET_TIME(now);
+		now = fiber_io_stamp();
 		if (fiber->when <= now) {
 			break;
 		}
@@ -349,7 +353,7 @@ ACL_FIBER *acl_fiber_create_timer(unsigned int milliseconds, size_t size,
 
 	fiber_io_check();
 
-	SET_TIME(when);
+	when = fiber_io_stamp();
 	when += milliseconds;
 
 	fiber           = acl_fiber_create(fiber_timer_callback, ctx, size);
@@ -364,7 +368,7 @@ void acl_fiber_reset_timer(ACL_FIBER *fiber, unsigned int milliseconds)
 
 	fiber_io_check();
 
-	SET_TIME(when);
+	when = fiber_io_stamp();
 	when += milliseconds;
 	fiber->when = when;
 	fiber->status = FIBER_STATUS_READY;
diff --git a/lib_fiber/c/src/hook/epoll.c b/lib_fiber/c/src/hook/epoll.c
index 879cc31bc..44683c765 100644
--- a/lib_fiber/c/src/hook/epoll.c
+++ b/lib_fiber/c/src/hook/epoll.c
@@ -376,8 +376,13 @@ static void event_epoll_set(EVENT *ev, EPOLL_EVENT *ee, int timeout)
 		ee->events[i].events = 0;
 	}
 
-	if (timeout >= 0 && (ev->timeout < 0 || timeout < ev->timeout)) {
-		ev->timeout = timeout;
+	if (timeout >= 0) {
+		ee->expire = event_get_stamp(ev) + timeout;
+		if (ev->timeout < 0 || timeout < ev->timeout) {
+			ev->timeout = timeout;
+		}
+	} else {
+		ee->expire = -1;
 	}
 }
 
@@ -385,7 +390,7 @@ int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout)
 {
 	EVENT *ev;
 	EPOLL_EVENT *ee;
-	long long begin, now;
+	long long now;
 	int old_timeout;
 
 	if (sys_epoll_wait == NULL) {
@@ -418,7 +423,6 @@ int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout)
 
 	old_timeout = ev->timeout;
 	event_epoll_set(ev, ee, timeout);
-	SET_TIME(begin);
 	ev->waiter++;
 
 	while (1) {
@@ -441,8 +445,9 @@ int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout)
 		if (ee->nready != 0 || timeout == 0) {
 			break;
 		}
-		SET_TIME(now);
-		if (timeout > 0 && (now - begin >= timeout)) {
+
+		now = event_get_stamp(ev);
+		if (ee->expire > 0 && now >= ee->expire) {
 			break;
 		}
 	}
diff --git a/lib_fiber/c/src/hook/poll.c b/lib_fiber/c/src/hook/poll.c
index 9d4a48a6f..c2aaf13a6 100644
--- a/lib_fiber/c/src/hook/poll.c
+++ b/lib_fiber/c/src/hook/poll.c
@@ -115,8 +115,13 @@ static void poll_event_set(EVENT *ev, POLL_EVENT *pe, int timeout)
 		pfd->pfd->revents = 0;
 	}
 
-	if (timeout >= 0 && (ev->timeout < 0 || timeout < ev->timeout)) {
-		ev->timeout = timeout;
+	if (timeout >= 0) {
+		pe->expire = event_get_stamp(ev) + timeout;
+		if (ev->timeout < 0 || timeout < ev->timeout) {
+			ev->timeout = timeout;
+		}
+	} else {
+		pe->expire = -1;
 	}
 }
 
@@ -128,8 +133,9 @@ static void poll_event_clean(EVENT *ev, POLL_EVENT *pe)
 		POLLFD *pfd = &pe->fds[i];
 
 		/* maybe has been cleaned in read_callback/write_callback */
-		if (pfd->fe == NULL)
+		if (pfd->fe == NULL) {
 			continue;
+		}
 
 		CLR_POLLING(pfd->fe);
 
@@ -190,7 +196,7 @@ static void pollfd_free(POLLFD *pfds)
 
 int WINAPI acl_fiber_poll(struct pollfd *fds, nfds_t nfds, int timeout)
 {
-	long long begin, now;
+	long long now;
 	POLL_EVENT pe;
 	EVENT *ev;
 	int old_timeout;
@@ -212,7 +218,6 @@ int WINAPI acl_fiber_poll(struct pollfd *fds, nfds_t nfds, int timeout)
 
 	old_timeout = ev->timeout;
 	poll_event_set(ev, &pe, timeout);
-	SET_TIME(begin);
 	ev->waiter++;
 
 	while (1) {
@@ -242,8 +247,9 @@ int WINAPI acl_fiber_poll(struct pollfd *fds, nfds_t nfds, int timeout)
 		if (pe.nready != 0 || timeout == 0) {
 			break;
 		}
-		SET_TIME(now);
-		if (timeout > 0 && (now - begin >= timeout)) {
+
+		now = event_get_stamp(ev);
+		if (pe.expire > 0 && now >= pe.expire) {
 			acl_fiber_set_error(FIBER_ETIMEDOUT);
 			break;
 		}