--- a/src/os/win32/ngx_thread.c
+++ b/src/os/win32/ngx_thread.c
@@ -67,44 +67,3 @@ ngx_thread_set_tls(ngx_tls_key_t *key, v
 
     return 0;
 }
-
-
-ngx_mutex_t *
-ngx_mutex_init(ngx_log_t *log, ngx_uint_t flags)
-{
-    ngx_mutex_t  *m;
-
-    m = ngx_alloc(sizeof(ngx_mutex_t), log);
-    if (m == NULL) {
-        return NULL;
-    }
-
-    m->log = log;
-
-    /* STUB */
-
-    return m;
-}
-
-
-/* STUB */
-
-void
-ngx_mutex_lock(ngx_mutex_t *m) {
-    return;
-}
-
-
-
-ngx_int_t
-ngx_mutex_trylock(ngx_mutex_t *m) {
-    return NGX_OK;
-}
-
-
-void
-ngx_mutex_unlock(ngx_mutex_t *m) {
-    return;
-}
-
-/**/