diff -r 000000000000 -r 6474c204b198 js/src/jslock.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jslock.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jslock_h
+#define jslock_h
+
+#ifdef JS_THREADSAFE
+
+#ifdef JS_POSIX_NSPR
+
+#include "vm/PosixNSPR.h"
+
+#else /* JS_POSIX_NSPR */
+
+# include "prcvar.h"
+# include "prinit.h"
+# include "prlock.h"
+# include "prthread.h"
+
+#endif
+
+#else  /* JS_THREADSAFE */
+
+typedef struct PRThread PRThread;
+typedef struct PRCondVar PRCondVar;
+typedef struct PRLock PRLock;
+
+#endif /* JS_THREADSAFE */
+
+#endif /* jslock_h */