diff --git a/server/robotserver/comgr.cc b/server/robotserver/comgr.cc
index 30a140a5..b3fcca21 100644
--- a/server/robotserver/comgr.cc
+++ b/server/robotserver/comgr.cc
@@ -15,13 +15,18 @@ void CoMgr::Init()
              for (int i = 0; i < 10; ++i) {
                  co->CoYield();
                  co->CoAwait(co->Sleep(1000));
+                 co->CoAwait(co->Sleep(3000));
+                 #if 0
                  co->CoAwait(CreateCo
                              (
                               [i] (Coroutine* co)
                               {
-                                  a8::XPrintf("call subco A %d %d\n", {i, a8::XGetTickCount()});
-                                  co->CoAwait(co->Sleep(3000));
+                                  a8::XPrintf("call subco A1 %d %d\n", {i, a8::XGetTickCount()});
+                                  //co->CoAwait(co->Sleep(3000));
+                                  ///co->Sleep(3000);
+                                  a8::XPrintf("call subco A2 %d %d\n", {i, a8::XGetTickCount()});
                               }).lock());
+                 #endif
                  a8::XPrintf("call A %d %d\n", {i, a8::XGetTickCount()});
              }
          });
diff --git a/server/robotserver/coroutine.cc b/server/robotserver/coroutine.cc
index f5f0ed33..11eb13a9 100644
--- a/server/robotserver/coroutine.cc
+++ b/server/robotserver/coroutine.cc
@@ -48,11 +48,7 @@ Coroutine::Coroutine(std::function<void(Coroutine*)> cb)
              CallEnter(sink);
              cb_(this);
              CallExit(sink);
-             for (auto notifyer : notifyers_) {
-                 if (!notifyer.expired()) {
-                     notifyer.lock()->DoResume();
-                 }
-             }
+             DoDone();
          });
 }
 
@@ -125,12 +121,6 @@ void Coroutine::CallExit(boost::coroutines2::coroutine<void>::push_type& sink)
 
 void Coroutine::DoAwait()
 {
-    done_ = true;
-    for (auto notifyer : notifyers_) {
-        if (!notifyer.expired()) {
-            notifyer.lock()->DoResume();
-        }
-    }
 }
 
 void Coroutine::DoResume()