diff --git a/build/ipc.pro b/build/ipc.pro
index 0f9441a..85082c8 100644
--- a/build/ipc.pro
+++ b/build/ipc.pro
@@ -4,8 +4,6 @@ TARGET = ipc
 CONFIG -= qt
 CONFIG += c++14 c++1z # may be useless
 
-!msvc:QMAKE_CXXFLAGS += -Wno-attributes -Wno-missing-field-initializers
-
 DEFINES += __IPC_LIBRARY__
 DESTDIR = ../output
 
@@ -29,7 +27,7 @@ HEADERS += \
     ../src/memory/wrapper.h \
     ../src/memory/resource.h \
     ../src/platform/detail.h \
-    ../src/platform/waiter.h \
+    ../src/platform/waiter_wrapper.h \
     ../src/circ/elem_def.h \
     ../src/circ/elem_array.h \
     ../src/prod_cons.h \
diff --git a/src/circ/elem_def.h b/src/circ/elem_def.h
index 4d8cfcc..deb6118 100644
--- a/src/circ/elem_def.h
+++ b/src/circ/elem_def.h
@@ -7,7 +7,7 @@
 
 #include "rw_lock.h"
 
-#include "platform/waiter.h"
+#include "platform/waiter_wrapper.h"
 #include "platform/detail.h"
 
 namespace ipc {
diff --git a/src/platform/waiter_linux.h b/src/platform/waiter_linux.h
index f899aae..129f9a4 100644
--- a/src/platform/waiter_linux.h
+++ b/src/platform/waiter_linux.h
@@ -68,8 +68,8 @@ public:
 
     void close(handle_t h) {
         if (h == invalid()) return;
+        ::printf("closing...\n");
         if (counter_.fetch_sub(1, std::memory_order_acq_rel) == 1) {
-            ::printf("destroy...\n");
             ::pthread_cond_destroy(&cond_);
             ::pthread_mutex_destroy(&mutex_);
             ::printf("destroy end...\n");
@@ -78,6 +78,7 @@ public:
 
     bool wait(handle_t h) {
         if (h == invalid()) return false;
+        ::printf("wait...\n");
         if (::pthread_mutex_lock(&mutex_) != 0) {
             return false;
         }
@@ -90,11 +91,13 @@ public:
 
     void notify(handle_t h) {
         if (h == invalid()) return;
+        ::printf("notify...\n");
         ::pthread_cond_signal(&cond_);
     }
 
     void broadcast(handle_t h) {
         if (h == invalid()) return;
+        ::printf("broadcast...\n");
         ::pthread_cond_broadcast(&cond_);
     }
 };
diff --git a/src/platform/waiter.h b/src/platform/waiter_wrapper.h
similarity index 87%
rename from src/platform/waiter.h
rename to src/platform/waiter_wrapper.h
index 4becc64..efe7e2f 100644
--- a/src/platform/waiter.h
+++ b/src/platform/waiter_wrapper.h
@@ -11,7 +11,7 @@
 namespace ipc {
 namespace detail {
 
-class waiter_impl {
+class waiter_wrapper {
 public:
     using waiter_t = detail::waiter;
 
@@ -20,12 +20,12 @@ private:
     waiter_t::handle_t h_ = waiter_t::invalid();
 
 public:
-    waiter_impl() = default;
-    explicit waiter_impl(waiter_t* w) {
+    waiter_wrapper() = default;
+    explicit waiter_wrapper(waiter_t* w) {
         attach(w);
     }
-    waiter_impl(const waiter_impl&) = delete;
-    waiter_impl& operator=(const waiter_impl&) = delete;
+    waiter_wrapper(const waiter_wrapper&) = delete;
+    waiter_wrapper& operator=(const waiter_wrapper&) = delete;
 
     waiter_t       * waiter()       { return w_; }
     waiter_t const * waiter() const { return w_; }
diff --git a/src/queue.h b/src/queue.h
index 92159e2..9da6cfa 100644
--- a/src/queue.h
+++ b/src/queue.h
@@ -15,15 +15,15 @@
 #include "shm.h"
 #include "rw_lock.h"
 
-#include "platform/waiter.h"
+#include "platform/waiter_wrapper.h"
 
 namespace ipc {
 namespace detail {
 
 class queue_waiter {
 protected:
-    ipc::detail::waiter_impl waiter_;
-    ipc::detail::waiter_impl cc_waiter_;
+    ipc::detail::waiter_wrapper waiter_;
+    ipc::detail::waiter_wrapper cc_waiter_;
 
     bool connected_ = false;
     bool dismiss_   = true;
diff --git a/src/waiter.cpp b/src/waiter.cpp
index 6ad643c..266001f 100644
--- a/src/waiter.cpp
+++ b/src/waiter.cpp
@@ -3,7 +3,7 @@
 #include <string>
 
 #include "def.h"
-#include "platform/waiter.h"
+#include "platform/waiter_wrapper.h"
 
 namespace ipc {
 
@@ -11,7 +11,7 @@ class waiter::waiter_ : public pimpl<waiter_> {
 public:
     std::string n_;
 
-    detail::waiter_impl w_ { new detail::waiter };
+    detail::waiter_wrapper w_ { new detail::waiter };
     ~waiter_() { delete w_.waiter(); }
 };