diff --git a/src/demo/coroutine/echo_client.c b/src/demo/coroutine/echo_client.c
index ec2ce195f20a5378373b693259bf4f6dfbeb259a..159cd6cc465eaa1610979a8483eaf00d1eb31686 100644
--- a/src/demo/coroutine/echo_client.c
+++ b/src/demo/coroutine/echo_client.c
@@ -73,6 +73,21 @@ static tb_void_t tb_demo_coroutine_echo(tb_cpointer_t priv)
     sock = tb_null;
 }
 
+static tb_void_t tb_demo_coroutine_test_loop(tb_cpointer_t priv)
+{
+    tb_int_t count = 0; 
+    while (tb_true)
+    {
+        count++;
+        
+        // trace
+        tb_trace_i("tb_demo_coroutine_test_loop() count = %d", count);
+        
+        // yield
+        tb_coroutine_yield();
+    }
+}
+
 /* //////////////////////////////////////////////////////////////////////////////////////
  * main
  */
@@ -91,6 +106,9 @@ tb_int_t tb_demo_coroutine_echo_client_main(tb_int_t argc, tb_char_t** argv)
     tb_co_scheduler_ref_t scheduler = tb_co_scheduler_init();
     if (scheduler)
     {
+        // start test loop
+        tb_coroutine_start(scheduler, tb_demo_coroutine_test_loop, tb_null, 0);
+    
         // start echo
         tb_size_t i = 0;
         for (i = 0; i < count; i++)
diff --git a/src/demo/coroutine/process_pipe.c b/src/demo/coroutine/process_pipe.c
index 41c9e0d2ad7f34f2e891ff57a61cfdbd31eb32ad..e6068f5d6b22262a6c71f6aaab6c108d38887883 100644
--- a/src/demo/coroutine/process_pipe.c
+++ b/src/demo/coroutine/process_pipe.c
@@ -27,7 +27,7 @@ static tb_void_t tb_demo_coroutine_proc(tb_cpointer_t priv)
     {
         // init process
         tb_process_attr_t attr = {0};
-        attr.outpipe = file[1];
+        attr.out.pipe = file[1];
         attr.outtype = TB_PROCESS_REDIRECT_TYPE_PIPE;
         tb_process_ref_t process = tb_process_init(argv[1], (tb_char_t const**)(argv + 1), &attr);
         if (process)
diff --git a/src/demo/coroutine/stackless/echo_client.c b/src/demo/coroutine/stackless/echo_client.c
index 014cafe83311706b2fa56e03b45e02601a5ecb09..733c0a7133895639b6093f210fc956e312c5edb8 100644
--- a/src/demo/coroutine/stackless/echo_client.c
+++ b/src/demo/coroutine/stackless/echo_client.c
@@ -134,6 +134,22 @@ static tb_void_t tb_demo_lo_coroutine_echo(tb_lo_coroutine_ref_t coroutine, tb_c
     }
 }
 
+static tb_void_t tb_demo_lo_coroutine_test_loop(tb_lo_coroutine_ref_t coroutine, tb_cpointer_t priv)
+{
+    // enter coroutine
+    tb_lo_coroutine_enter(coroutine)
+    {
+        while (tb_true)
+        {
+            // trace
+            tb_trace_i("tb_demo_lo_coroutine_test_loop()");
+            
+            // yield
+            tb_lo_coroutine_yield();
+        }
+    }
+}
+
 /* //////////////////////////////////////////////////////////////////////////////////////
  * main
  */
@@ -149,6 +165,9 @@ tb_int_t tb_demo_lo_coroutine_echo_client_main(tb_int_t argc, tb_char_t** argv)
     tb_lo_scheduler_ref_t scheduler = tb_lo_scheduler_init();
     if (scheduler)
     {
+        // start test loop
+        tb_lo_coroutine_start(scheduler, tb_demo_lo_coroutine_test_loop, tb_null, tb_null);
+        
         // start echo
         tb_size_t i = 0;
         for (i = 0; i < count; i++)
diff --git a/src/demo/coroutine/stackless/process_pipe.c b/src/demo/coroutine/stackless/process_pipe.c
index e4df6bac22f925f11a381976b4a9bde022412bf5..98578d4b249f93fad8a2725fc71c8360e410b9c3 100644
--- a/src/demo/coroutine/stackless/process_pipe.c
+++ b/src/demo/coroutine/stackless/process_pipe.c
@@ -55,7 +55,7 @@ static tb_void_t tb_demo_lo_coroutine_func(tb_lo_coroutine_ref_t coroutine, tb_c
         if (tb_pipe_file_init_pair(process->file, 0))
         {
             // init process
-            process->attr.outpipe = process->file[1];
+            process->attr.out.pipe = process->file[1];
             process->attr.outtype = TB_PROCESS_REDIRECT_TYPE_PIPE;
             process->proc = tb_process_init(process->argv[1], (tb_char_t const**)(process->argv + 1), &process->attr);
             if (process->proc)
diff --git a/src/tbox/coroutine/impl/scheduler_io.c b/src/tbox/coroutine/impl/scheduler_io.c
index 56bdccc804062ce17cabb6c0a7f39be6a8cf9a60..1e913f4e71db51d274fbcaac5f3b473c08ff5a56 100644
--- a/src/tbox/coroutine/impl/scheduler_io.c
+++ b/src/tbox/coroutine/impl/scheduler_io.c
@@ -233,6 +233,13 @@ static tb_void_t tb_co_scheduler_io_loop(tb_cpointer_t priv)
         {
             // spak timer
             if (!tb_co_scheduler_io_timer_spak(scheduler_io)) break;
+            
+            // check io events
+            if (tb_poller_wait(poller, tb_co_scheduler_io_events, 0) < 0)
+            {
+                tb_trace_e("loop: check poller failed!");
+                break;
+            }
         }
 
         // no more suspended coroutines? loop end
diff --git a/src/tbox/coroutine/impl/stackless/scheduler_io.c b/src/tbox/coroutine/impl/stackless/scheduler_io.c
index 9412c4265cd20c3e5397f0a61e53ed813bad64ec..9ef1498efc318f15e83874cb79a8afd252d022de 100644
--- a/src/tbox/coroutine/impl/stackless/scheduler_io.c
+++ b/src/tbox/coroutine/impl/stackless/scheduler_io.c
@@ -271,6 +271,8 @@ static tb_void_t tb_lo_scheduler_io_loop(tb_lo_coroutine_ref_t coroutine, tb_cpo
                 // spak timer
                 if (!tb_lo_scheduler_io_timer_spak(scheduler_io)) break;
 #endif
+                // check io events
+                if (tb_poller_wait(scheduler_io->poller, tb_lo_scheduler_io_events, 0) < 0) break;
             }
 
             // no more suspended coroutines? loop end