diff --git a/src/platform/waiter.h b/src/platform/waiter.h
index 33daf95..4becc64 100644
--- a/src/platform/waiter.h
+++ b/src/platform/waiter.h
@@ -48,8 +48,8 @@ public:
 
     void close() {
         if (!valid()) return;
-        w_->close(h_);
         ::printf("close %p\n", h_);
+        w_->close(h_);
         h_ = waiter_t::invalid();
     }
 
diff --git a/src/platform/waiter_linux.h b/src/platform/waiter_linux.h
index 5424702..bc05124 100644
--- a/src/platform/waiter_linux.h
+++ b/src/platform/waiter_linux.h
@@ -75,8 +75,10 @@ public:
         if (h == invalid()) return;
         auto w = waiter_cast(h);
         if (w->counter_.fetch_sub(1, std::memory_order_acq_rel) == 1) {
+            ::printf("destroy...\n");
             ::pthread_cond_destroy (&(w->cond_ ));
             ::pthread_mutex_destroy(&(w->mutex_));
+            ::printf("destroy end...\n");
         }
     }