diff --git a/server/robotserver/comgr.cc b/server/robotserver/comgr.cc
index 9278ffb9..30a140a5 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 784114fe..f5f0ed33 100644
--- a/server/robotserver/coroutine.cc
+++ b/server/robotserver/coroutine.cc
@@ -19,6 +19,16 @@ std::shared_ptr<Awaiter> Awaiter::Sleep(int time)
     return std::make_shared<TimerPromise>(time);
 }
 
+void Awaiter::DoDone()
+{
+    done_ = true;
+    for (auto notifyer : notifyers_) {
+        if (!notifyer.expired()) {
+            notifyer.lock()->DoResume();
+        }
+    }
+}
+
 void Promise::DoAwait()
 {
 
@@ -136,12 +146,7 @@ void TimerPromise::DoAwait()
          [this, _self = shared_from_this()] (int event, const a8::Args* args) mutable
          {
              if (event == a8::TIMER_EXEC_EVENT) {
-                 done_ = true;
-                 for (auto notifyer : notifyers_) {
-                     if (!notifyer.expired()) {
-                         notifyer.lock()->DoResume();
-                     }
-                 }
+                 DoDone();
              }
          });
 }
diff --git a/server/robotserver/coroutine.h b/server/robotserver/coroutine.h
index 4d9ba029..46986d87 100644
--- a/server/robotserver/coroutine.h
+++ b/server/robotserver/coroutine.h
@@ -42,6 +42,7 @@ protected:
     std::list<std::weak_ptr<Awaiter>> notifyers_;
     void Await(std::shared_ptr<Awaiter> notifyer);
     virtual void DoAwait() = 0;
+    void DoDone();
 
  private:
     std::shared_ptr<a8::Results> results_;