diff --git a/server/robotserver/comgr.cc b/server/robotserver/comgr.cc
index 30a140a5..9278ffb9 100644
--- a/server/robotserver/comgr.cc
+++ b/server/robotserver/comgr.cc
@@ -20,7 +20,7 @@ void CoMgr::Init()
                               [i] (Coroutine* co)
                               {
                                   a8::XPrintf("call subco A %d %d\n", {i, a8::XGetTickCount()});
-                                  co->CoAwait(co->Sleep(3000));
+                                  //co->CoAwait(co->Sleep(3000));
                               }).lock());
                  a8::XPrintf("call A %d %d\n", {i, a8::XGetTickCount()});
              }
diff --git a/server/robotserver/coroutine.cc b/server/robotserver/coroutine.cc
index 06be912f..784114fe 100644
--- a/server/robotserver/coroutine.cc
+++ b/server/robotserver/coroutine.cc
@@ -115,7 +115,12 @@ 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()