new file mode 100644
--- /dev/null
+++ b/src/os/unix/ngx_x86_mutex.h
@@ -0,0 +1,30 @@
+
+
+typedef struct {
+    int  lock;
+} ngx_mutex_t;
+
+
+static inline int ngx_spin_lock(ngx_mutex_t *m, int count)
+{
+    int  lock;
+
+    __asm__ __volatile("
+
+get_lock:
+        mov   $1, %1
+        xchg  %1, %2
+        cmp   $0, %1
+        jne   spin_lock
+
+spin_lock:
+        cmp   $0, %3
+        je    failed
+
+        dec   %3
+        rep   nop
+        cmp   $0, %2
+        jne   spin_lock
+
+    ": "=q" (lock), "m" (m->lock), "q" (count));
+}