diff --git a/src/event/ngx_event_timer.c b/src/event/ngx_event_timer.c
new file mode 100644
index 0000000..f4222cc
--- /dev/null
+++ b/src/event/ngx_event_timer.c
@@ -0,0 +1,33 @@
+
+
+void ngx_add_timer(ngx_event_t *ev, ngx_msec_t timer)
+{
+    ngx_event_t  *e;
+
+#if (NGX_DEBUG_EVENT)
+    ngx_connection_t *c = (ngx_connection_t *) ev->data;
+    ngx_log_debug(ev->log, "set timer: %d:%d" _ c->fd _ timer);
+#endif
+
+    if (ev->timer_next || ev->timer_prev) {
+        ngx_log_error(NGX_LOG_ALERT, ev->log, 0, "timer already set");
+        return;
+    }
+
+    n = timer % ngx_timer_hash_size;
+
+    for (e = timer_queue[n].timer_next;
+         e != &timer_queue[n] && timer > e->timer_delta;
+         e = e->timer_next)
+    {
+        timer -= e->timer_delta;
+    }
+
+    ev->timer_delta = timer;
+
+    ev->timer_next = e;
+    ev->timer_prev = e->timer_prev;
+
+    e->timer_prev->timer_next = ev;
+    e->timer_prev = ev;
+}