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diff --git a/js/jsd/jsd_lock.h b/js/jsd/jsd_lock.h
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+/*
+ * 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 void*
+jsd_CreateLock();
+
+extern void
+jsd_Lock(JSDStaticLock* lock);
+
+extern void
+jsd_Unlock(JSDStaticLock* lock);
+
+#ifdef DEBUG
+extern JSBool
+jsd_IsLocked(JSDStaticLock* lock);
+#endif /* DEBUG */
+
+extern void*
+jsd_CurrentThread();
+
+#endif /* jsd_lock_h___ */