add comments for #161

@@ -64,6 +64,47 @@ int sleep_test()
     return 0;
     return 0;
 }
 }
 
 
+void* sleep2_func0(void* arg)
+{
+    int sleep_ms = 100;
+    st_utime_t start = st_utime();
+    st_usleep(sleep_ms * 1000);
+    st_utime_t end = st_utime();
+    
+    srs_trace("sleep ok, sleep=%dus, deviation=%dus", 
+        (int)(sleep_ms * 1000), (int)(end - start - sleep_ms * 1000));
+        
+    return NULL;
+}
+
+void* sleep2_func1(void* arg)
+{
+    int sleep_ms = 250;
+    st_utime_t start = st_utime();
+    st_usleep(sleep_ms * 1000);
+    st_utime_t end = st_utime();
+    
+    srs_trace("sleep ok, sleep=%dus, deviation=%dus", 
+        (int)(sleep_ms * 1000), (int)(end - start - sleep_ms * 1000));
+        
+    return NULL;
+}
+
+int sleep2_test()
+{
+    srs_trace("===================================================");
+    srs_trace("sleep2 test: start");
+    
+    st_thread_t trd0 = st_thread_create(sleep2_func0, NULL, 1, 0);
+    st_thread_t trd1 = st_thread_create(sleep2_func1, NULL, 1, 0);
+    st_thread_join(trd0, NULL);
+    st_thread_join(trd1, NULL);
+
+    srs_trace("sleep test: end");
+    exit(0);
+    return 0;
+}
+
 st_mutex_t sleep_work_cond = NULL;
 st_mutex_t sleep_work_cond = NULL;
 void* sleep_deviation_func(void* arg)
 void* sleep_deviation_func(void* arg)
 {
 {
@@ -400,8 +441,8 @@ int main(int argc, char** argv)
         return -1;
         return -1;
     }
     }
     
     
-    if (huge_stack_test() < 0) {
-        srs_trace("huge_stack_test failed");
+    if (sleep2_test() < 0) {
+        srs_trace("sleep2_test failed");
         return -1;
         return -1;
     }
     }
     
     
@@ -415,6 +456,11 @@ int main(int argc, char** argv)
         return -1;
         return -1;
     }
     }
     
     
+    if (huge_stack_test() < 0) {
+        srs_trace("huge_stack_test failed");
+        return -1;
+    }
+    
     if (thread_test() < 0) {
     if (thread_test() < 0) {
         srs_trace("thread_test failed");
         srs_trace("thread_test failed");
         return -1;
         return -1;

@@ -534,6 +534,10 @@ int SrsRtmpConn::playing(SrsSource* source)
                 // it's ok, do nothing.
                 // it's ok, do nothing.
                 ret = ERROR_SUCCESS;
                 ret = ERROR_SUCCESS;
                 srs_verbose("recv timeout, ignore. ret=%d", ret);
                 srs_verbose("recv timeout, ignore. ret=%d", ret);
+                
+                // TODO: FIXME: the timeout may caused some dead loop.
+                // @see: https://github.com/winlinvip/simple-rtmp-server/issues/161
+                st_usleep(0);
             } else if (ret != ERROR_SUCCESS) {
             } else if (ret != ERROR_SUCCESS) {
                 if (!srs_is_client_gracefully_close(ret)) {
                 if (!srs_is_client_gracefully_close(ret)) {
                     srs_error("recv client control message failed. ret=%d", ret);
                     srs_error("recv client control message failed. ret=%d", ret);

@@ -48,6 +48,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // signal defines.
 // signal defines.
 #define SIGNAL_RELOAD SIGHUP
 #define SIGNAL_RELOAD SIGHUP
 
 
+// nginx also set to 512
 #define SERVER_LISTEN_BACKLOG 512
 #define SERVER_LISTEN_BACKLOG 512
 
 
 // system interval in ms,
 // system interval in ms,