恢复新版本下的mutex功能，并完成相关范例

benchmark/benchmark_async_mem.cpp

 	using namespace std::chrono;
 	
 	resumef::state_t<void> st;
-	std::cout << sizeof(st) << " " << sizeof(resumef::promise_vt) << std::endl;
+	std::cout << sizeof(st) << " " << sizeof(resumef::promise_t<>) << std::endl;
 
 	for (size_t i = 0; i < N; ++i)
 	{
 				globalValue += i * k;
 				co_yield k;
 			}
-			return 0;
+			co_return 0;
 		};
 	}
 

librf/src/mutex.cpp

 #include "mutex.h"
 #include <assert.h>
 #include "scheduler.h"
+#include "awaitable.h"
+#include "state.inl"
 
 namespace resumef
 {
 
 	future_t<bool> mutex_t::lock() const
 	{
-		promise_t<bool> awaitable;
+		awaitable_t<bool> awaitable;
 
 		auto awaker = std::make_shared<detail::mutex_awaker>(
 			[st = awaitable._state](detail::mutex_impl * e) -> bool
 
 	future_t<bool> mutex_t::try_lock_until_(const clock_type::time_point & tp) const
 	{
-		promise_t<bool> awaitable;
+		awaitable_t<bool> awaitable;
 
 		auto awaker = std::make_shared<detail::mutex_awaker>(
 			[st = awaitable._state](detail::mutex_impl * e) -> bool

librf/src/state.h

 #endif
 		bool _is_awaitor;
 	public:
+		state_future_t()
+		{
+#if RESUMEF_DEBUG_COUNTER
+			_id = ++g_resumef_state_id;
+#endif
+			_is_awaitor = false;
+		}
 		state_future_t(bool awaitor)
 		{
 #if RESUMEF_DEBUG_COUNTER
 		void set_exception(std::exception_ptr e);
 
 		template<class _Exp>
-		void throw_exception(_Exp e) const
+		void throw_exception(_Exp e)
 		{
 			set_exception(std::make_exception_ptr(std::move(e)));
 		}

librf/src/when.h

 		template<class _Tup, class... _Fty>
 		future_t<_Tup> when_all_count(size_t count, const std::shared_ptr<_Tup> & vals, scheduler_t & s, _Fty&&... f)
 		{
-			promise_t<_Tup> awaitable;
+			awaitable_t<_Tup> awaitable;
 
 			when_impl_ptr _event = std::make_shared<when_impl>(count);
 			auto awaker = std::make_shared<when_awaker>(

vs_proj/librf.cpp

 	//resumable_main_exception();
 	//resumable_main_dynamic_go();
 	//resumable_main_multi_thread();
-	resumable_main_timer();
+	//resumable_main_timer();
+	//resumable_main_benchmark_mem();
+	resumable_main_mutex();
 
 /*
 	resumable_main_benchmark_mem();
 
 	resumable_main_when_all();
 	resumable_main_sleep();
-	resumable_main_mutex();
 	resumable_main_event();
 	resumable_main_event_timeout();
 	resumable_main_channel();

vs_proj/librf.vcxproj

   <ItemGroup>
     <ClCompile Include="..\benchmark\benchmark_asio_echo.cpp">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
-    </ClCompile>
-    <ClCompile Include="..\benchmark\benchmark_async_mem.cpp">
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
     </ClCompile>
+    <ClCompile Include="..\benchmark\benchmark_async_mem.cpp" />
     <ClCompile Include="..\benchmark\benchmark_channel_passing_next.cpp">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
     </ClCompile>
-    <ClCompile Include="..\librf\src\mutex.cpp">
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
-    </ClCompile>
+    <ClCompile Include="..\librf\src\mutex.cpp" />
     <ClCompile Include="..\librf\src\rf_task.cpp" />
     <ClCompile Include="..\librf\src\scheduler.cpp" />
     <ClCompile Include="..\librf\src\sleep.cpp" />
     <ClCompile Include="..\tutorial\test_async_exception.cpp" />
     <ClCompile Include="..\tutorial\test_async_modern_cb.cpp" />
     <ClCompile Include="..\tutorial\test_async_multi_thread.cpp" />
-    <ClCompile Include="..\tutorial\test_async_mutex.cpp">
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
-    </ClCompile>
+    <ClCompile Include="..\tutorial\test_async_mutex.cpp" />
     <ClCompile Include="..\tutorial\test_async_resumable.cpp" />
     <ClCompile Include="..\tutorial\test_async_routine.cpp" />
     <ClCompile Include="..\tutorial\test_async_sleep.cpp">