diff --git a/trunk/src/app/srs_app_hourglass.cpp b/trunk/src/app/srs_app_hourglass.cpp
index 88aeb2612..24cec52e4 100644
--- a/trunk/src/app/srs_app_hourglass.cpp
+++ b/trunk/src/app/srs_app_hourglass.cpp
@@ -26,7 +26,6 @@
 using namespace std;
 
 #include <srs_kernel_error.hpp>
-#include <srs_app_st.hpp>
 #include <srs_kernel_log.hpp>
 
 ISrsHourGlass::ISrsHourGlass()
@@ -42,13 +41,31 @@ SrsHourGlass::SrsHourGlass(ISrsHourGlass* h, srs_utime_t resolution)
     handler = h;
     _resolution = resolution;
     total_elapse = 0;
+    trd = new SrsSTCoroutine("timer", this, _srs_context->get_id());
 }
 
 SrsHourGlass::~SrsHourGlass()
 {
+    srs_freep(trd);
 }
 
-srs_error_t SrsHourGlass::tick(int type, srs_utime_t interval)
+srs_error_t SrsHourGlass::start()
+{
+    srs_error_t err = srs_success;
+
+    if ((err = trd->start()) != srs_success) {
+        return srs_error_wrap(err, "start timer");
+    }
+
+    return err;
+}
+
+srs_error_t SrsHourGlass::tick(srs_utime_t interval)
+{
+    return tick(0, interval);
+}
+
+srs_error_t SrsHourGlass::tick(int event, srs_utime_t interval)
 {
     srs_error_t err = srs_success;
     
@@ -57,7 +74,7 @@ srs_error_t SrsHourGlass::tick(int type, srs_utime_t interval)
             "invalid interval=%dms, resolution=%dms", srsu2msi(interval), srsu2msi(_resolution));
     }
     
-    ticks[type] = interval;
+    ticks[event] = interval;
     
     return err;
 }
@@ -65,22 +82,28 @@ srs_error_t SrsHourGlass::tick(int type, srs_utime_t interval)
 srs_error_t SrsHourGlass::cycle()
 {
     srs_error_t err = srs_success;
+
+    while (true) {
+        if ((err = trd->pull()) != srs_success) {
+            return srs_error_wrap(err, "quit");
+        }
     
-    map<int, srs_utime_t>::iterator it;
-    for (it = ticks.begin(); it != ticks.end(); ++it) {
-        int type = it->first;
-        srs_utime_t interval = it->second;
-        
-        if (interval == 0 || (total_elapse % interval) == 0) {
-            if ((err = handler->notify(type, interval, total_elapse)) != srs_success) {
-                return srs_error_wrap(err, "notify");
+        map<int, srs_utime_t>::iterator it;
+        for (it = ticks.begin(); it != ticks.end(); ++it) {
+            int event = it->first;
+            srs_utime_t interval = it->second;
+
+            if (interval == 0 || (total_elapse % interval) == 0) {
+                if ((err = handler->notify(event, interval, total_elapse)) != srs_success) {
+                    return srs_error_wrap(err, "notify");
+                }
             }
         }
-    }
 
-    // TODO: FIXME: Maybe we should use wallclock.
-    total_elapse += _resolution;
-    srs_usleep(_resolution);
+        // TODO: FIXME: Maybe we should use wallclock.
+        total_elapse += _resolution;
+        srs_usleep(_resolution);
+    }
     
     return err;
 }
diff --git a/trunk/src/app/srs_app_hourglass.hpp b/trunk/src/app/srs_app_hourglass.hpp
index 3c8447d4c..aeb6893b5 100644
--- a/trunk/src/app/srs_app_hourglass.hpp
+++ b/trunk/src/app/srs_app_hourglass.hpp
@@ -26,8 +26,12 @@
 
 #include <srs_core.hpp>
 
+#include <srs_app_st.hpp>
+
 #include <map>
 
+class SrsCoroutine;
+
 // The handler for the tick.
 class ISrsHourGlass
 {
@@ -36,40 +40,41 @@ public:
     virtual ~ISrsHourGlass();
 public:
     // When time is ticked, this function is called.
-    virtual srs_error_t notify(int type, srs_utime_t interval, srs_utime_t tick) = 0;
+    virtual srs_error_t notify(int event, srs_utime_t interval, srs_utime_t tick) = 0;
 };
 
-// he hourglass used to do some specieal task,
-// while these task is cycle when some interval, for example,
-// there are N=3 tasks to do:
-//          1. heartbeat every 3s.
-//          2. print message every 5s.
-//          3. notify backend every 7s.
+// The hourglass(timer or SrsTimer) for special tasks,
+// while these tasks are attached to some intervals, for example,
+// there are N=3 tasks bellow:
+//          1. A heartbeat every 3s.
+//          2. A print message every 5s.
+//          3. A notify backend every 7s.
 // The hourglass will call back when ticks:
-//          1. notify(type=1, time=3)
-//          2. notify(type=2, time=5)
-//          3. notify(type=1, time=6)
-//          4. notify(type=3, time=7)
-//          5. notify(type=1, time=9)
-//          6. notify(type=2, time=10)
-// This is used for server and bocar server and other manager.
+//          1. Got notify(event=1, time=3)
+//          2. Got notify(event=2, time=5)
+//          3. Got notify(event=1, time=6)
+//          4. Got notify(event=3, time=7)
+//          5. Got notify(event=1, time=9)
+//          6. Got notify(event=2, time=10)
+// It's a complex and high-performance timer.
 //
 // Usage:
 //      SrsHourGlass* hg = new SrsHourGlass(handler, 1 * SRS_UTIME_MILLISECONDS);
+//
 //      hg->tick(1, 3 * SRS_UTIME_MILLISECONDS);
 //      hg->tick(2, 5 * SRS_UTIME_MILLISECONDS);
 //      hg->tick(3, 7 * SRS_UTIME_MILLISECONDS);
-//      // create a thread to cycle, which will call handerl when ticked.
-//      while (true) {
-//          hg->cycle();
-//      }
-class SrsHourGlass
+//
+//      // The hg will create a thread for timer.
+//      hg->start();
+class SrsHourGlass : virtual public ISrsCoroutineHandler
 {
 private:
+    SrsCoroutine* trd;
     ISrsHourGlass* handler;
     srs_utime_t _resolution;
     // The ticks:
-    //      key: the type of tick.
+    //      key: the event of tick.
     //      value: the interval of tick.
     std::map<int, srs_utime_t> ticks;
     // The total elapsed time,
@@ -79,10 +84,14 @@ public:
     SrsHourGlass(ISrsHourGlass* h, srs_utime_t resolution);
     virtual ~SrsHourGlass();
 public:
-    // Add a pair of tick(type, interval).
-    // @param type the type of tick.
+    // Start the hourglass.
+    virtual srs_error_t start();
+public:
+    // Add a pair of tick(event, interval).
+    // @param event the event of tick, default is 0.
     // @param interval the interval in srs_utime_t of tick.
-    virtual srs_error_t tick(int type, srs_utime_t interval);
+    virtual srs_error_t tick(srs_utime_t interval);
+    virtual srs_error_t tick(int event, srs_utime_t interval);
 public:
     // Cycle the hourglass, which will sleep resolution every time.
     // and call handler when ticked.
diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index ec4d08e2c..d739a53f4 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -1151,23 +1151,25 @@ srs_error_t SrsRtcSession::on_rtcp(SrsUdpMuxSocket* udp_mux_skt)
 SrsRtcServer::SrsRtcServer()
 {
     listener = NULL;
+    timer = new SrsHourGlass(this, 1 * SRS_UTIME_SECONDS);
 }
 
 SrsRtcServer::~SrsRtcServer()
 {
     srs_freep(listener);
-
-    rttrd->stop();
-    srs_freep(rttrd);
+    srs_freep(timer);
 }
 
 srs_error_t SrsRtcServer::initialize()
 {
     srs_error_t err = srs_success;
 
-    rttrd = new SrsRtcTimerThread(this, _srs_context->get_id());
-    if ((err = rttrd->start()) != srs_success) {
-        return srs_error_wrap(err, "rtc timer thread init failed");
+    if ((err = timer->tick(1 * SRS_UTIME_SECONDS)) != srs_success) {
+        return srs_error_wrap(err, "hourglass tick");
+    }
+
+    if ((err = timer->start()) != srs_success) {
+        return srs_error_wrap(err, "start timer");
     }
 
     return err;
@@ -1369,60 +1371,10 @@ void SrsRtcServer::check_and_clean_timeout_session()
     }
 }
 
-SrsRtcTimerThread::SrsRtcTimerThread(SrsRtcServer* rtc_svr, int parent_cid)
+srs_error_t SrsRtcServer::notify(int type, srs_utime_t interval, srs_utime_t tick)
 {
-    _parent_cid = parent_cid;
-    trd = new SrsDummyCoroutine();
-
-    rtc_server = rtc_svr;
-}
-
-SrsRtcTimerThread::~SrsRtcTimerThread()
-{
-    srs_freep(trd);
-}
-
-int SrsRtcTimerThread::cid()
-{
-    return trd->cid();
-}
-
-srs_error_t SrsRtcTimerThread::start()
-{
-    srs_error_t err = srs_success;
-    
-    srs_freep(trd);
-    trd = new SrsSTCoroutine("rtc_timer", this, _parent_cid);
-    
-    if ((err = trd->start()) != srs_success) {
-        return srs_error_wrap(err, "rtc_timer");
-    }
-    
-    return err;
-}
-
-void SrsRtcTimerThread::stop()
-{
-    trd->stop();
-}
-
-void SrsRtcTimerThread::stop_loop()
-{
-    trd->interrupt();
-}
-
-srs_error_t SrsRtcTimerThread::cycle()
-{
-    srs_error_t err = srs_success;
-
-    while (true) {
-		if ((err = trd->pull()) != srs_success) {
-            return srs_error_wrap(err, "rtc timer thread");
-        }
-
-        srs_usleep(1 * SRS_UTIME_SECONDS);
-        rtc_server->check_and_clean_timeout_session();
-    }
+    check_and_clean_timeout_session();
+    return srs_success;
 }
 
 RtcServerAdapter::RtcServerAdapter()
diff --git a/trunk/src/app/srs_app_rtc_conn.hpp b/trunk/src/app/srs_app_rtc_conn.hpp
index 5cef95d93..029c8d4ab 100644
--- a/trunk/src/app/srs_app_rtc_conn.hpp
+++ b/trunk/src/app/srs_app_rtc_conn.hpp
@@ -30,6 +30,7 @@
 #include <srs_kernel_utility.hpp>
 #include <srs_rtmp_stack.hpp>
 #include <srs_app_hybrid.hpp>
+#include <srs_app_hourglass.hpp>
 
 #include <string>
 #include <map>
@@ -238,32 +239,11 @@ private:
     srs_error_t on_rtcp_receiver_report(char* buf, int nb_buf, SrsUdpMuxSocket* udp_mux_skt);
 };
 
-// TODO: FIXME: is there any other timer thread?
-class SrsRtcTimerThread : public ISrsCoroutineHandler
-{
-protected:
-    SrsCoroutine* trd;
-    int _parent_cid;
-private:
-    SrsRtcServer* rtc_server;
-public:
-    SrsRtcTimerThread(SrsRtcServer* rtc_svr, int parent_cid);
-    virtual ~SrsRtcTimerThread();
-public:
-    virtual int cid();
-public:
-    virtual srs_error_t start();
-    virtual void stop();
-    virtual void stop_loop();
-public:
-    virtual srs_error_t cycle();
-};
-
-class SrsRtcServer : public ISrsUdpMuxHandler
+class SrsRtcServer : virtual public ISrsUdpMuxHandler, virtual public ISrsHourGlass
 {
 private:
     SrsUdpMuxListener* listener;
-    SrsRtcTimerThread* rttrd;
+    SrsHourGlass* timer;
 private:
     std::map<std::string, SrsRtcSession*> map_username_session; // key: username(local_ufrag + ":" + remote_ufrag)
     std::map<std::string, SrsRtcSession*> map_id_session; // key: peerip(ip + ":" + port)
@@ -289,6 +269,9 @@ private:
 private:
     SrsRtcSession* find_rtc_session_by_username(const std::string& ufrag);
     SrsRtcSession* find_rtc_session_by_peer_id(const std::string& peer_id);
+// interface ISrsHourGlass
+public:
+    virtual srs_error_t notify(int type, srs_utime_t interval, srs_utime_t tick);
 };
 
 // The RTC server adapter.