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diff --git a/pr/src/md/mac/mdcriticalregion.h b/pr/src/md/mac/mdcriticalregion.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 
+ * 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 the Netscape Portable Runtime (NSPR).
+ * 
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation.  Portions created by Netscape are 
+ * Copyright (C) 1998-2000 Netscape Communications Corporation.  All
+ * Rights Reserved.
+ * 
+ * Contributor(s):
+ *                George Warner, Apple Computer Inc.
+ *                Simon Fraser  <sfraser@netscape.com>
+ * 
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU General Public License Version 2 or later (the
+ * "GPL"), in which case the provisions of the GPL are applicable 
+ * instead of those above.  If you wish to allow use of your 
+ * version of this file only under the terms of the GPL and not to
+ * allow others to use your version of this file under the MPL,
+ * indicate your decision by deleting the provisions above and
+ * replace them with the notice and other provisions required by
+ * the GPL.  If you do not delete the provisions above, a recipient
+ * may use your version of this file under either the MPL or the
+ * GPL.
+ */
+
+#ifndef mdcriticalregion_h___
+#define mdcriticalregion_h___
+
+
+#ifndef __MULTIPROCESSING__
+#include <Multiprocessing.h>
+#endif
+
+typedef struct OpaqueMDCriticalRegionID*  MDCriticalRegionID;
+
+OSStatus MD_CriticalRegionCreate(MDCriticalRegionID * pMDCriticalRegionID);
+
+OSStatus MD_CriticalRegionDelete(MDCriticalRegionID pMDCriticalRegionID);
+
+OSStatus MD_CriticalRegionEnter(MDCriticalRegionID pMDCriticalRegionID, Duration pTimeout);
+
+OSStatus MD_CriticalRegionExit(MDCriticalRegionID pMDCriticalRegionID);
+
+#endif /* mdcriticalregion_h___ */
+