diff -r 000000000000 -r 6474c204b198 js/jsd/jsd_lock.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/jsd/jsd_lock.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* -*- 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/. */
+
+/*
+ * Header for JavaScript Debugging support - Locking and threading functions
+ */
+
+#ifndef jsd_lock_h___
+#define jsd_lock_h___
+
+/* 
+ * If you want to support threading and locking, define JSD_THREADSAFE and 
+ * implement the functions below.
+ */
+
+/*
+ * NOTE: These locks must be reentrant in the sense that they support
+ * nested calls to lock and unlock.
+ */
+
+typedef struct JSDStaticLock JSDStaticLock;
+
+extern JSDStaticLock*
+jsd_CreateLock();
+
+extern void
+jsd_Lock(JSDStaticLock* lock);
+
+extern void
+jsd_Unlock(JSDStaticLock* lock);
+
+#ifdef DEBUG
+extern bool
+jsd_IsLocked(JSDStaticLock* lock);
+#endif /* DEBUG */
+
+extern void*
+jsd_CurrentThread();
+
+#endif /* jsd_lock_h___ */