new file mode 100644
--- /dev/null
+++ b/src/event/ngx_event_mutex.c
@@ -0,0 +1,70 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+
+
+ngx_int_t ngx_event_mutex_timedlock(ngx_event_mutex_t *m, ngx_msec_t timer,
+                                    ngx_event_t *ev)
+{
+    ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
+                   "lock event mutex " PTR_FMT " lock:%X", m, m->lock);
+
+    if (m->lock) {
+
+        if (m->events == NULL) {
+            m->events = ev;
+
+        } else {
+            m->last->next = ev;
+        }
+
+        m->last = ev;
+        ev->next = NULL;
+
+#if (NGX_THREADS0)
+        ev->light = 1;
+#endif
+
+        ngx_add_timer(ev, timer);
+
+        return NGX_AGAIN;
+    }
+
+    m->lock = 1;
+
+    return NGX_OK;
+}
+
+
+ngx_int_t ngx_event_mutex_unlock(ngx_event_mutex_t *m, ngx_log_t *log)
+{
+    ngx_event_t  *ev;
+
+    if (m->lock == 0) {
+        ngx_log_error(NGX_LOG_ALERT, log, 0,
+                      "tring to unlock the free event mutex " PTR_FMT, m);
+        return NGX_ERROR;
+    }
+
+    ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
+                   "unlock event mutex " PTR_FMT ", next event: " PTR_FMT,
+                   m, m->events);
+
+    m->lock = 0;
+
+    if (m->events) {
+        ev = m->events;
+        m->events = ev->next;
+
+        ev->next = (ngx_event_t *) ngx_posted_events;
+        ngx_posted_events = ev;
+    }
+
+    return NGX_OK;
+}