diff --git a/lib_fiber/samples/server6/Makefile b/lib_fiber/samples/server6/Makefile
new file mode 100644
index 000000000..5ab377af6
--- /dev/null
+++ b/lib_fiber/samples/server6/Makefile
@@ -0,0 +1,2 @@
+include ../Makefile_cpp.in
+PROG = server
diff --git a/lib_fiber/samples/server6/main.cpp b/lib_fiber/samples/server6/main.cpp
new file mode 100644
index 000000000..c4ef00cb8
--- /dev/null
+++ b/lib_fiber/samples/server6/main.cpp
@@ -0,0 +1,149 @@
+#include "stdafx.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+static bool tried = false, is_sleeping = false;
+static acl::socket_stream* first = NULL, *second = NULL;
+
+static void fiber_client(acl::socket_stream* conn)
+{
+	conn->set_rw_timeout(20);
+	int fd = conn->sock_handle();
+
+	printf("fiber-%d running, fiber=%p\r\n", acl::fiber::self(), acl_fiber_running());
+
+	char buf[8192];
+	while (true) {
+		printf(">>>%s: fiber=%p, begin read, fd=%d, %d\n",
+			__FUNCTION__, acl_fiber_running(),
+			conn->sock_handle(), fd);
+
+		int ret = conn->read(buf, sizeof(buf), false);
+
+		printf(">>>%s: fiber=%p,  read=%d, fd=%d, %d\n",
+			__FUNCTION__, acl_fiber_running(), ret,
+			conn->sock_handle(), fd);
+
+		if (ret == -1) {
+			printf("fiber-%d, read error %s from fd %d, %d, fiber=%p\r\n",
+				acl::fiber::self(), acl::last_serror(),
+				conn->sock_handle(), fd, acl_fiber_running());
+			break;
+		}
+
+		if (conn->write(buf, ret) == -1) {
+			printf("fiber-%d, write error %s to fd %d\r\n",
+				acl::fiber::self(), acl::last_serror(),
+				conn->sock_handle());
+			break;
+		}
+
+		if (conn == first) {
+			if (second) {
+				printf("---close another fd=%d, me fiber=%p\n",
+					second->sock_handle(), acl_fiber_running());
+				int sock = second->sock_handle();
+				if (is_sleeping) {
+					second->unbind_sock();
+				}
+				close(sock);
+				//second->close();
+				printf("---close another fd=%d ok, fiber=%p\n",
+					sock, acl_fiber_running());
+				second = NULL;
+			} else {
+				printf("---another fd closed\r\n");
+			}
+		}
+
+		//continue;
+
+		if (conn == second) {
+			time_t begin = time(NULL);
+			printf("second fiber-%d, %p, fd=%d sleep\n",
+				acl::fiber::self(), acl_fiber_running(),
+				conn->sock_handle());
+			is_sleeping = true;
+			sleep(15);
+			is_sleeping = false;
+			printf("second fiber-%d, %p, fd=%d wakeup, diff=%ld second\n",
+				acl::fiber::self(), acl_fiber_running(),
+				conn->sock_handle(), time(NULL) - begin);
+		}
+	}
+
+	printf("\r\n>>fiber=%p, delete conn, fd=%d\n",
+		acl_fiber_running(), conn->sock_handle());
+	delete conn;
+	printf(">>fiber=%p, delete conn ok: %s\n\n",
+		acl_fiber_running(), acl::last_serror());
+}
+
+static void fiber_server(acl::server_socket& ss)
+{
+	while (true) {
+		acl::socket_stream* conn = ss.accept();
+		if (conn == NULL) {
+			printf("accept error %s\r\n", acl::last_serror());
+			break;
+		}
+
+		printf("accept ok, fd: %d\r\n", conn->sock_handle());
+
+		if (first == NULL) {
+			first = conn;
+		} else if (second == NULL) {
+			if (!tried) {
+				second = conn;
+				tried = true;
+			}
+		}
+
+		go[=] {
+			fiber_client(conn);
+		};
+	}
+}
+
+static void usage(const char* procname)
+{
+	printf("usage: %s -h [help] -s listen_addr\r\n", procname);
+}
+
+int main(int argc, char *argv[])
+{
+	int  ch;
+
+	acl::acl_cpp_init();
+	acl::string addr("127.0.0.1:9006");
+	acl::log::stdout_open(true);
+	acl::fiber::stdout_open(true);
+
+	while ((ch = getopt(argc, argv, "hs:")) > 0) {
+		switch (ch) {
+		case 'h':
+			usage(argv[0]);
+			return 0;
+		case 's':
+			addr = optarg;
+			break;
+		default:
+			break;
+		}
+	}
+
+	acl::server_socket ss;
+	if (!ss.open(addr)) {
+		printf("listen %s error %s\r\n", addr.c_str(), acl::last_serror());
+		return 1;
+	}
+	printf("listen %s ok\r\n", addr.c_str());
+
+	go[&] {
+		fiber_server(ss);
+	};
+
+	acl::fiber::schedule();	// start fiber schedule
+
+	return 0;
+}
diff --git a/lib_fiber/samples/server6/stdafx.cpp b/lib_fiber/samples/server6/stdafx.cpp
new file mode 100644
index 000000000..a27b824da
--- /dev/null
+++ b/lib_fiber/samples/server6/stdafx.cpp
@@ -0,0 +1 @@
+#include "stdafx.h"
diff --git a/lib_fiber/samples/server6/stdafx.h b/lib_fiber/samples/server6/stdafx.h
new file mode 100644
index 000000000..ea39dfb29
--- /dev/null
+++ b/lib_fiber/samples/server6/stdafx.h
@@ -0,0 +1,22 @@
+// stdafx.h : 标准系统包含文件的包含文件，
+// 或是常用但不常更改的项目特定的包含文件
+//
+
+#pragma once
+
+
+//#include <iostream>
+//#include <tchar.h>
+
+// TODO: 在此处引用程序要求的附加头文件
+
+#include "lib_acl.h"
+#include "acl_cpp/lib_acl.hpp"
+#include "fiber/fiber.hpp"
+#include "fiber/libfiber.h"
+#include "fiber/go_fiber.hpp"
+
+#ifdef	WIN32
+#define	snprintf _snprintf
+#endif
+
diff --git a/lib_fiber/samples/server6/t.sh b/lib_fiber/samples/server6/t.sh
new file mode 100755
index 000000000..6e4652794
--- /dev/null
+++ b/lib_fiber/samples/server6/t.sh
@@ -0,0 +1 @@
+valgrind --tool=memcheck --leak-check=yes --leak-check=full --show-reachable=yes  -v ./server