--- a/src/os/win32/ngx_thread.h
+++ b/src/os/win32/ngx_thread.h
@@ -18,12 +18,6 @@ typedef DWORD   ngx_tls_key_t;
 typedef DWORD   ngx_thread_value_t;
 
 
-typedef struct {
-    HANDLE      mutex;
-    ngx_log_t   *log;
-} ngx_mutex_t;
-
-
 ngx_err_t ngx_create_thread(ngx_tid_t *tid,
     ngx_thread_value_t (__stdcall *func)(void *arg), void *arg, ngx_log_t *log);
 ngx_int_t ngx_init_threads(int n, size_t size, ngx_cycle_t *cycle);
@@ -34,25 +28,10 @@ ngx_err_t ngx_thread_set_tls(ngx_tls_key
 #define ngx_thread_set_tls_n         "TlsSetValue()"
 #define ngx_thread_get_tls           TlsGetValue
 
-
-#define ngx_thread_volatile  volatile
-
 #define ngx_log_tid                 GetCurrentThreadId()
 #define NGX_TID_T_FMT               "%ud"
 
 
-ngx_mutex_t *ngx_mutex_init(ngx_log_t *log, ngx_uint_t flags);
-
-void ngx_mutex_lock(ngx_mutex_t *m);
-ngx_int_t ngx_mutex_trylock(ngx_mutex_t *m);
-void ngx_mutex_unlock(ngx_mutex_t *m);
-
-
-/* STUB */
-#define NGX_MUTEX_LIGHT             0
-/**/
-
-
 extern ngx_int_t  ngx_threads_n;