diff --git a/include/nana/audio/detail/buffer_preparation.hpp b/include/nana/audio/detail/buffer_preparation.hpp
index 57e6f32e..7272d9b1 100644
--- a/include/nana/audio/detail/buffer_preparation.hpp
+++ b/include/nana/audio/detail/buffer_preparation.hpp
@@ -23,6 +23,8 @@
 	#include <windows.h>
 #endif
 
+#include <atomic>
+
 namespace nana{	namespace audio
 {
 	namespace detail
@@ -52,8 +54,8 @@ namespace nana{	namespace audio
 		private:
 			void _m_prepare_routine();
 		private:
-			volatile bool running_;
-			volatile bool wait_for_buffer_;
+			std::atomic<bool> running_;
+			std::atomic<bool> wait_for_buffer_;
 			std::thread thr_;
 			mutable std::mutex token_buffer_, token_prepared_;
 			mutable std::condition_variable	cond_buffer_, cond_prepared_;
diff --git a/include/nana/pat/cloneable.hpp b/include/nana/pat/cloneable.hpp
index 350dbe1a..60d691f6 100644
--- a/include/nana/pat/cloneable.hpp
+++ b/include/nana/pat/cloneable.hpp
@@ -193,7 +193,7 @@ namespace nana{ namespace pat{
 			cwrapper_.reset();
 		}
 
-		operator operator_bool_t() const volatile noexcept
+		operator operator_bool_t() const noexcept
 		{
 			return (fast_ptr_ ? &inner_bool::true_stand : nullptr);
 		}
diff --git a/include/nana/system/timepiece.hpp b/include/nana/system/timepiece.hpp
index fe188f45..248a798e 100644
--- a/include/nana/system/timepiece.hpp
+++ b/include/nana/system/timepiece.hpp
@@ -1,6 +1,6 @@
 /*
  *	Timepiece Implementation
- *	Copyright(C) 2003-2013 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -21,11 +21,11 @@ namespace system
 	{
 	public:
 		timepiece();
-		timepiece(const volatile timepiece&);
+		timepiece(const timepiece&);
 		~timepiece();
-		timepiece & operator=(const volatile timepiece &);
-		void start() volatile;              ///<  	Set the begin time.
-		double calc() const volatile;       ///<    Get the intervals from the begin time.
+		timepiece & operator=(const timepiece &);
+		void start() noexcept;              ///<  	Set the begin time.
+		double calc() const noexcept;       ///<    Get the intervals from the begin time.
 	private:
 		struct impl_t;
 		impl_t * impl_;
diff --git a/source/detail/posix/msg_dispatcher.hpp b/source/detail/posix/msg_dispatcher.hpp
index 6bef753e..9ba12ad1 100644
--- a/source/detail/posix/msg_dispatcher.hpp
+++ b/source/detail/posix/msg_dispatcher.hpp
@@ -26,6 +26,7 @@
 #include <condition_variable>
 #include <memory>
 #include <thread>
+#include <atomic>
 
 namespace nana
 {
@@ -340,7 +341,7 @@ namespace detail
 
 	private:
 		Display * display_;
-		volatile bool is_work_{ false };
+		std::atomic<bool> is_work_{ false };
 		std::unique_ptr<std::thread> thrd_;
 
 		struct table_tag
diff --git a/source/detail/posix/platform_spec.hpp b/source/detail/posix/platform_spec.hpp
index a4755370..3191ddb1 100644
--- a/source/detail/posix/platform_spec.hpp
+++ b/source/detail/posix/platform_spec.hpp
@@ -20,6 +20,7 @@
 
 #include <nana/push_ignore_diagnostic>
 
+#include <atomic>
 #include <thread>
 #include <mutex>
 #include <memory>
@@ -268,7 +269,7 @@ namespace detail
 		std::recursive_mutex xlib_locker_;
 		struct caret_holder_tag
 		{
-			volatile bool exit_thread;
+			std::atomic<bool> exit_thread;
 			std::unique_ptr<std::thread> thr;
 			std::map<native_window_type, caret_rep*> carets;
 		}caret_holder_;
diff --git a/source/system/timepiece.cpp b/source/system/timepiece.cpp
index fb2f71b9..e8f98d24 100644
--- a/source/system/timepiece.cpp
+++ b/source/system/timepiece.cpp
@@ -24,7 +24,7 @@ namespace system
 			: impl_(new impl_t)
 		{}
 
-		timepiece::timepiece(const volatile timepiece& rhs)
+		timepiece::timepiece(const timepiece& rhs)
 			: impl_(new impl_t(*rhs.impl_))
 		{}
 
@@ -33,7 +33,7 @@ namespace system
 			delete impl_;
 		}
 
-		timepiece & timepiece::operator=(const volatile timepiece & rhs)
+		timepiece & timepiece::operator=(const timepiece & rhs)
 		{
 			if(this != &rhs)
 				*impl_ = *rhs.impl_;
@@ -41,7 +41,7 @@ namespace system
 			return *this;
 		}
 
-		void timepiece::start() volatile
+		void timepiece::start() noexcept
 		{
 #if defined(NANA_WINDOWS)
 			::QueryPerformanceCounter(&impl_->beg_timestamp);
@@ -51,7 +51,7 @@ namespace system
 #endif
 		}
 
-		double timepiece::calc() const volatile
+		double timepiece::calc() const noexcept
 		{
 #if defined(NANA_WINDOWS)
 			LARGE_INTEGER li;