兼容gcc 10

librf/src/mutex_v2.inl

 				for (int cnt = rand() % (1 + _mutex.size()); cnt >= 0; --cnt)
 				{
 					std::this_thread::yield();	//还要考虑多线程里运行的情况
-					co_await yield_awaitor{};
+					co_await yield();
 				}
 			}
 			future_t<> _ReturnValue() const;

librf/src/without_deadlock_assemble.inl

 	static auto _Lock_nonmember2(_LA& _LkN) ->decltype(_LkN._ReturnValue())
 	{
 		// lock 2 locks, without deadlock, special case for better codegen and reduced metaprogramming for common case
-#if defined(__GNUC__)
 		for (;;)
 		{
 			auto _Result__ = LOCK_ASSEMBLE_AWAIT(_Lock_attempt_small2(_LkN, 0, 1));
 			_Result__ = LOCK_ASSEMBLE_AWAIT(_Lock_attempt_small2(_LkN, 1, 0));
 			if (!_Result__) break;
 		}
-#else
-		while (LOCK_ASSEMBLE_AWAIT(_Lock_attempt_small2(_LkN, 0, 1)) && 
-			LOCK_ASSEMBLE_AWAIT(_Lock_attempt_small2(_LkN, 1, 0)))
-		{ // keep trying
-		}
-#endif
 	}
 
 	template<_LockAssembleT _LA>

tutorial/test_async_mutex.cpp

 
 		++g_counter;
 		//std::cout << "push:" << g_counter << " on " << idx << std::endl;
-		
 		//co_await 5ms;
 	}
 }
 
 		--g_counter;
 		//std::cout << "pop :" << g_counter << " on " << idx << std::endl;
-
 		//co_await 5ms;
-		//co_await mutex_t::unlock(a, b, c);
 	}
 }