diff --git a/qse/include/qse/Types.hpp b/qse/include/qse/Types.hpp
index fbfa41ef..791ba397 100644
--- a/qse/include/qse/Types.hpp
+++ b/qse/include/qse/Types.hpp
@@ -215,7 +215,6 @@ public:
 		E_ENOIMPL, /**< not implemented */
 		E_ESYSERR, /**< subsystem error */
 		E_EINTERN, /**< internal error */
-		E_EEXCEPT, /**< exception */
 
 		E_ENOMEM,
 		E_EINVAL,
@@ -227,7 +226,9 @@ public:
 		E_EINTR,
 		E_EPIPE,
 		E_EINPROG, /* in progress */
-		E_EAGAIN   /* resource unavailable unavailable */
+		E_EAGAIN,   /* resource unavailable unavailable */
+
+		E_EEXCEPT /**< exception */
 	};
 };
 
diff --git a/qse/include/qse/si/TcpServer.hpp b/qse/include/qse/si/TcpServer.hpp
index 69295dba..0f40425a 100644
--- a/qse/include/qse/si/TcpServer.hpp
+++ b/qse/include/qse/si/TcpServer.hpp
@@ -32,15 +32,16 @@
 #include <qse/si/Thread.hpp>
 #include <qse/si/SpinLock.hpp>
 #include <qse/cmn/LinkedList.hpp>
+#include <qse/cmn/Mmged.hpp>
 #include <qse/Uncopyable.hpp>
-
+#include <qse/si/mux.h>
 
 QSE_BEGIN_NAMESPACE(QSE)
 
 // The TcpServer class implements a simple block TCP server that start a thread
 // for each connection accepted.
 
-class TcpServer: public Uncopyable, public Types
+class TcpServer: public Uncopyable, public Mmged, public Types
 {
 public:
 	TcpServer () QSE_CPP_NOEXCEPT;
@@ -134,22 +135,22 @@ protected:
 
 	struct ListenerList
 	{
-		ListenerList(): ep_fd(-1), head(QSE_NULL), tail(QSE_NULL), count(0)
+		ListenerList(): mux(QSE_NULL), head(QSE_NULL), tail(QSE_NULL), count(0)
 		{
 			this->mux_pipe[0] = -1;
 			this->mux_pipe[1] = -1;
 		}
 
-		int ep_fd;
+		qse_mux_t* mux;
 		int mux_pipe[2];
 
 		Listener* head;
 		Listener* tail;
 
 		qse_size_t count;
-	} listener;
+	} listener_list;
 
-	ErrorCode errcode;
+	ErrorCode     errcode;
 	bool          stop_requested;
 	bool          server_serving;
 	qse_size_t    max_connections;
@@ -167,6 +168,8 @@ private:
 
 	int setup_listeners (const qse_char_t* addrs) QSE_CPP_NOEXCEPT;
 	void free_all_listeners () QSE_CPP_NOEXCEPT;
+
+	static void dispatch_mux_event (qse_mux_t* mux, const qse_mux_evt_t* evt) QSE_CPP_NOEXCEPT;
 };
 
 
diff --git a/qse/lib/si/TcpServer.cpp b/qse/lib/si/TcpServer.cpp
index 8a837cbc..8fd19c09 100644
--- a/qse/lib/si/TcpServer.cpp
+++ b/qse/lib/si/TcpServer.cpp
@@ -106,55 +106,133 @@ TcpServer::~TcpServer () QSE_CPP_NOEXCEPT
 void TcpServer::free_all_listeners () QSE_CPP_NOEXCEPT
 {
 	Listener* lp;
-	struct epoll_event dummy_ev;
 
-	while (this->listener.head)
+	while (this->listener_list.head)
 	{
-		lp = this->listener.head;
-		this->listener.head = lp->next_listener;
-		this->listener.count--;
+		lp = this->listener_list.head;
+		this->listener_list.head = lp->next_listener;
+		this->listener_list.count--;
+
+		qse_mux_evt_t evt;
+		evt.hnd = lp->getHandle();
+		qse_mux_delete (this->listener_list.mux, &evt);
 
-		::epoll_ctl (this->listener.ep_fd, EPOLL_CTL_DEL, lp->getHandle(), &dummy_ev);
 		lp->close ();
 		delete lp;
 	}
 
-	if (this->listener.mux_pipe[0] >= 0)
+	if (this->listener_list.mux_pipe[0] >= 0)
 	{
-		::epoll_ctl (this->listener.ep_fd, EPOLL_CTL_DEL, this->listener.mux_pipe[0], &dummy_ev);
-		close (this->listener.mux_pipe[0]);
-		this->listener.mux_pipe[0] = -1;
-	}
-	if (this->listener.mux_pipe[1] >= 0)
-	{
-		close (this->listener.mux_pipe[1]);
-		this->listener.mux_pipe[1] = -1;
-	}
-	QSE_ASSERT (this->listener.ep_fd >= 0);
+		qse_mux_evt_t evt;
+		evt.hnd = this->listener_list.mux_pipe[0];
+		qse_mux_delete (this->listener_list.mux, &evt);
 
-	::close (this->listener.ep_fd);
-	this->listener.ep_fd = -1;
+		close (this->listener_list.mux_pipe[0]);
+		this->listener_list.mux_pipe[0] = -1;
+	}
+	if (this->listener_list.mux_pipe[1] >= 0)
+	{
+		close (this->listener_list.mux_pipe[1]);
+		this->listener_list.mux_pipe[1] = -1;
+	}
+
+	QSE_ASSERT (this->listener_list.mux != QSE_NULL);
+	qse_mux_close (this->listener_list.mux);
+	this->listener_list.mux = QSE_NULL;
 }
 
+struct mux_xtn_t
+{
+	TcpServer* server;
+};
+
+void TcpServer::dispatch_mux_event (qse_mux_t* mux, const qse_mux_evt_t* evt) QSE_CPP_NOEXCEPT
+{
+	mux_xtn_t* mux_xtn = (mux_xtn_t*)qse_mux_getxtn(mux);
+	TcpServer* server = mux_xtn->server;
+
+	if (!evt->mask) return;
+
+	if (evt->data == NULL)
+	{
+		char tmp[128];
+		while (::read(server->listener_list.mux_pipe[0], tmp, QSE_SIZEOF(tmp)) > 0) /* nothing */;
+	}
+	else
+	{
+		/* the reset should be the listener's socket */
+		Listener* lsck = (Listener*)evt->data;
+
+		if (server->max_connections > 0 && server->max_connections <= server->client_list.getSize()) 
+		{
+			// too many connections. accept the connection and close it.
+			Socket s;
+			SocketAddress sa;
+			if (lsck->accept(&s, &sa, Socket::T_CLOEXEC) >= 0) s.close();
+			return;
+		}
+
+		Client* client;
+
+		// allocating the client object before accept is 
+		// a bit awkward. but socket.accept() can be passed
+		// the socket field inside the client object.
+		try { client = new Client (lsck); } 
+		catch (...) 
+		{
+			// memory alloc failed. accept the connection and close it.
+			Socket s;
+			SocketAddress sa;
+			if (lsck->accept(&s, &sa, Socket::T_CLOEXEC) >= 0) s.close();
+			return;
+		}
+
+		if (lsck->accept(&client->socket, &client->address, Socket::T_CLOEXEC) <= -1)
+		{
+			if (server->isStopRequested()) return; /* normal termination requested */
+
+			Socket::ErrorCode lerr = lsck->getErrorCode();
+			if (lerr == Socket::E_EINTR || lerr == Socket::E_EAGAIN) return;
+
+			server->setErrorCode (lerr);
+			server->stop ();
+			//xret = -1;
+			return;
+		}
+
+		client->setStackSize (server->thread_stack_size);
+	#if defined(_WIN32)
+		if (client->start(Thread::DETACHED) <= -1) 
+	#else
+		if (client->start(0) <= -1)
+	#endif
+		{
+			delete client; 
+			client = QSE_NULL;
+			return;
+		}
+
+		server->client_list.append (client);
+	}
+}
+
+
 int TcpServer::setup_listeners (const qse_char_t* addrs) QSE_CPP_NOEXCEPT
 {
 	const qse_char_t* addr_ptr, * comma;
-	int ep_fd = -1, fcv;
-	struct epoll_event ev;
-	int pfd[2] = { -1, - 1 };
+	qse_mux_t* mux = QSE_NULL;
+	qse_mux_evt_t ev;
+	int fcv, pfd[2] = { -1, - 1 };
 	SocketAddress sockaddr;
 
-	ep_fd = ::epoll_create(1024);
-	if (ep_fd <= -1)
+	mux = qse_mux_open(this->getMmgr(), QSE_SIZEOF(mux_xtn_t), TcpServer::dispatch_mux_event, 1024, QSE_NULL); 
+	if (!mux)
 	{
 		this->setErrorCode (syserr_to_errnum(errno));
 		return -1;
 	}
-
-#if defined(O_CLOEXEC)
-	fcv = ::fcntl(ep_fd, F_GETFD, 0);
-	if (fcv >= 0) ::fcntl(ep_fd, F_SETFD, fcv | O_CLOEXEC);
-#endif
+	mux_xtn_t* mux_xtn = (mux_xtn_t*)qse_mux_getxtn(mux);
+	mux_xtn->server = this;
 
 	if (::pipe(pfd) <= -1)
 	{
@@ -176,12 +254,21 @@ int TcpServer::setup_listeners (const qse_char_t* addrs) QSE_CPP_NOEXCEPT
 #endif
 
 	QSE_MEMSET (&ev, 0, QSE_SIZEOF(ev));
+	/*
 	ev.events = EPOLLIN | EPOLLHUP | EPOLLERR;
 	ev.data.ptr = QSE_NULL;
-	if (::epoll_ctl(ep_fd, EPOLL_CTL_ADD, pfd[0], &ev) <= -1)
+	if (::epoll_ctl(mux, EPOLL_CTL_ADD, pfd[0], &ev) <= -1)
 	{
 		this->setErrorCode (syserr_to_errnum(errno));
 		goto oops;
+	}*/
+	ev.hnd = pfd[0];
+	ev.mask = QSE_MUX_IN;
+	ev.data = QSE_NULL;
+	if (qse_mux_insert(mux, &ev) <= -1)
+	{
+		this->setErrorCode (E_ESYSERR);
+		goto oops;
 	}
 
 	addr_ptr = addrs;
@@ -228,38 +315,50 @@ int TcpServer::setup_listeners (const qse_char_t* addrs) QSE_CPP_NOEXCEPT
 		}
 
 		QSE_MEMSET (&ev, 0, QSE_SIZEOF(ev));
+	#if 0
 		ev.events = EPOLLIN | EPOLLHUP | EPOLLERR;
 		ev.data.ptr = lsck;
-		if (::epoll_ctl(ep_fd, EPOLL_CTL_ADD, lsck->getHandle(), &ev) <= -1)
+		if (::epoll_ctl(mux, EPOLL_CTL_ADD, lsck->getHandle(), &ev) <= -1)
 		{
 			/* TODO: logging */
 			lsck->close ();
 			goto next_segment;
 		}
+	#else
+		ev.hnd = lsck->getHandle();
+		ev.mask = QSE_MUX_IN;
+		ev.data = lsck;
+		if (qse_mux_insert(mux, &ev) <= -1)
+		{
+			/* TODO: logging */
+			lsck->close ();
+			goto next_segment;
+		}
+	#endif
 
 		lsck->address = sockaddr;
-		lsck->next_listener = this->listener.head;
-		this->listener.head = lsck;
-		this->listener.count++;
+		lsck->next_listener = this->listener_list.head;
+		this->listener_list.head = lsck;
+		this->listener_list.count++;
 
 	next_segment:
 		if (!comma) break;
 		addr_ptr = comma + 1;
 	}
 
-	if (!this->listener.head) goto oops;
+	if (!this->listener_list.head) goto oops;
 	
-	this->listener.ep_fd = ep_fd;
-	this->listener.mux_pipe[0] = pfd[0];
-	this->listener.mux_pipe[1] = pfd[1];
+	this->listener_list.mux = mux;
+	this->listener_list.mux_pipe[0] = pfd[0];
+	this->listener_list.mux_pipe[1] = pfd[1];
 
 	return 0;
 
 oops:
-	if (this->listener.head) this->free_all_listeners ();
+	if (this->listener_list.head) this->free_all_listeners ();
 	if (pfd[0] >= 0) close (pfd[0]);
 	if (pfd[1] >= 0) close (pfd[1]);
-	if (ep_fd >= 0) close (ep_fd);
+	if (mux) qse_mux_close (mux);
 	return -1;
 }
 
@@ -288,7 +387,10 @@ int TcpServer::start (const qse_char_t* addrs) QSE_CPP_NOEXCEPT
 		{
 			int n;
 
-			n = ::epoll_wait (this->listener.ep_fd, ev_buf, QSE_COUNTOF(ev_buf), -1);
+			n = qse_mux_poll (this->listener_list.mux, QSE_NULL);
+
+#if 0
+			n = ::epoll_wait (this->listener_list.mux, ev_buf, QSE_COUNTOF(ev_buf), -1);
 			this->delete_dead_clients ();
 			if (n <= -1)
 			{
@@ -312,7 +414,7 @@ int TcpServer::start (const qse_char_t* addrs) QSE_CPP_NOEXCEPT
 				if (evp->data.ptr == NULL)
 				{
 					char tmp[128];
-					while (::read(this->listener.mux_pipe[0], tmp, QSE_SIZEOF(tmp)) > 0) /* nothing */;
+					while (::read(this->listener_list.mux_pipe[0], tmp, QSE_SIZEOF(tmp)) > 0) /* nothing */;
 				}
 				else
 				{
@@ -324,7 +426,7 @@ int TcpServer::start (const qse_char_t* addrs) QSE_CPP_NOEXCEPT
 						// too many connections. accept the connection and close it.
 						Socket s;
 						SocketAddress sa;
-						if (socket.accept(&s, &sa, Socket::T_CLOEXEC) >= 0) s.close();
+						if (lsck->accept(&s, &sa, Socket::T_CLOEXEC) >= 0) s.close();
 						continue;
 					}
 
@@ -373,6 +475,7 @@ int TcpServer::start (const qse_char_t* addrs) QSE_CPP_NOEXCEPT
 					client = QSE_NULL;
 				}
 			}
+#endif
 		}
 
 		this->delete_all_clients ();
@@ -403,9 +506,9 @@ int TcpServer::stop () QSE_CPP_NOEXCEPT
 	if (this->server_serving) 
 	{
 // TODO: mutex
-		if (this->listener.mux_pipe[1] >= 0)
+		if (this->listener_list.mux_pipe[1] >= 0)
 		{
-			::write (this->listener.mux_pipe[1], "Q", 1);
+			::write (this->listener_list.mux_pipe[1], "Q", 1);
 		}
 // TODO: mutex
 		this->setStopRequested (true);
diff --git a/qse/samples/si/tcpsvr01.cpp b/qse/samples/si/tcpsvr01.cpp
index 60574ab3..62ffcecf 100644
--- a/qse/samples/si/tcpsvr01.cpp
+++ b/qse/samples/si/tcpsvr01.cpp
@@ -41,11 +41,13 @@ static int test1 (void)
 		([&server](QSE::Socket* clisock, QSE::SocketAddress* cliaddr) {
 			qse_char_t buf[128];
 			qse_uint8_t bb[256];
+			qse_ssize_t n;
 
 			while (!server.isStopRequested())
 			{
 qse_printf (QSE_T("hello word..from %s\n"), cliaddr->toStrBuf(buf, QSE_COUNTOF(buf)));
-				if (clisock->receive(bb, QSE_COUNTOF(bb)) <= 0) break;
+				if ((n = clisock->receive(bb, QSE_COUNTOF(bb))) <= 0) break;
+				clisock->send (bb, n);
 			}
 qse_printf (QSE_T("bye..to %s\n"), cliaddr->toStrBuf(buf, QSE_COUNTOF(buf)));
 			return 0;