diff --git a/trunk/src/app/srs_app_hybrid.cpp b/trunk/src/app/srs_app_hybrid.cpp
index 941fef02b..cecd3a2e0 100644
--- a/trunk/src/app/srs_app_hybrid.cpp
+++ b/trunk/src/app/srs_app_hybrid.cpp
@@ -115,8 +115,10 @@ SrsPps* _srs_pps_timer_s = new SrsPps(_srs_clock);
 extern int _st_active_count;
 extern unsigned long long _st_stat_thread_run;
 extern unsigned long long _st_stat_thread_idle;
+extern unsigned long long _st_stat_thread_yield;
 SrsPps* _srs_pps_thread_run = new SrsPps(_srs_clock);
 SrsPps* _srs_pps_thread_idle = new SrsPps(_srs_clock);
+SrsPps* _srs_pps_thread_yield = new SrsPps(_srs_clock);
 
 ISrsHybridServer::ISrsHybridServer()
 {
@@ -428,8 +430,9 @@ srs_error_t SrsHybridServer::notify(int event, srs_utime_t interval, srs_utime_t
 
     string thread_desc;
     _srs_pps_thread_run->update(_st_stat_thread_run); _srs_pps_thread_idle->update(_st_stat_thread_idle);
-    if (_st_active_count > 0 || _srs_pps_thread_run->r10s() || _srs_pps_thread_idle->r10s()) {
-        snprintf(buf, sizeof(buf), ", co=%d,%d,%d", _st_active_count, _srs_pps_thread_run->r10s(), _srs_pps_thread_idle->r10s());
+    _srs_pps_thread_yield->update(_st_stat_thread_yield);
+    if (_st_active_count > 0 || _srs_pps_thread_run->r10s() || _srs_pps_thread_idle->r10s() || _srs_pps_thread_yield->r10s()) {
+        snprintf(buf, sizeof(buf), ", co=%d,%d,%d,%d", _st_active_count, _srs_pps_thread_run->r10s(), _srs_pps_thread_idle->r10s(), _srs_pps_thread_yield->r10s());
         thread_desc = buf;
     }
 
diff --git a/trunk/src/protocol/srs_service_st.cpp b/trunk/src/protocol/srs_service_st.cpp
index 99cf856af..a4189dd8e 100644
--- a/trunk/src/protocol/srs_service_st.cpp
+++ b/trunk/src/protocol/srs_service_st.cpp
@@ -156,6 +156,11 @@ void srs_thread_exit(void* retval)
     st_thread_exit(retval);
 }
 
+void srs_thread_yield()
+{
+    st_thread_yield();
+}
+
 srs_error_t srs_tcp_connect(string server, int port, srs_utime_t tm, srs_netfd_t* pstfd)
 {
     st_utime_t timeout = ST_UTIME_NO_TIMEOUT;
diff --git a/trunk/src/protocol/srs_service_st.hpp b/trunk/src/protocol/srs_service_st.hpp
index 263bb5104..bcad9c8b9 100644
--- a/trunk/src/protocol/srs_service_st.hpp
+++ b/trunk/src/protocol/srs_service_st.hpp
@@ -58,6 +58,7 @@ extern srs_error_t srs_fd_keepalive(int fd);
 // Get current coroutine/thread.
 extern srs_thread_t srs_thread_self();
 extern void srs_thread_exit(void* retval);
+extern void srs_thread_yield();
 
 // For client, to open socket and connect to server.
 // @param tm The timeout in srs_utime_t.