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diff --git a/pr/include/prlock.h b/pr/include/prlock.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** 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 the Netscape Portable Runtime (NSPR).
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998-2000
+ * 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 ***** */
+
+/*
+** File:		prlock.h
+** Description:	API to basic locking functions of NSPR.
+**
+**
+** NSPR provides basic locking mechanisms for thread synchronization.  Locks 
+** are lightweight resource contention controls that prevent multiple threads 
+** from accessing something (code/data) simultaneously.
+**/
+
+#ifndef prlock_h___
+#define prlock_h___
+
+#include "prtypes.h"
+
+PR_BEGIN_EXTERN_C
+
+/**********************************************************************/
+/************************* TYPES AND CONSTANTS ************************/
+/**********************************************************************/
+
+/*
+ * PRLock --
+ *
+ *     NSPR represents the lock as an opaque entity to the client of the
+ *	   API.  All routines operate on a pointer to this opaque entity.
+ */
+
+typedef struct PRLock PRLock;
+
+/**********************************************************************/
+/****************************** FUNCTIONS *****************************/
+/**********************************************************************/
+
+/***********************************************************************
+** FUNCTION:    PR_NewLock
+** DESCRIPTION:
+**  Returns a pointer to a newly created opaque lock object.
+** INPUTS:      void
+** OUTPUTS:     void
+** RETURN:      PRLock*
+**   If the lock can not be created because of resource constraints, NULL
+**   is returned.
+**  
+***********************************************************************/
+NSPR_API(PRLock*) PR_NewLock(void);
+
+/***********************************************************************
+** FUNCTION:    PR_DestroyLock
+** DESCRIPTION:
+**  Destroys a given opaque lock object.
+** INPUTS:      PRLock *lock
+**              Lock to be freed.
+** OUTPUTS:     void
+** RETURN:      None
+***********************************************************************/
+NSPR_API(void) PR_DestroyLock(PRLock *lock);
+
+/***********************************************************************
+** FUNCTION:    PR_Lock
+** DESCRIPTION:
+**  Lock a lock.
+** INPUTS:      PRLock *lock
+**              Lock to locked.
+** OUTPUTS:     void
+** RETURN:      None
+***********************************************************************/
+NSPR_API(void) PR_Lock(PRLock *lock);
+
+/***********************************************************************
+** FUNCTION:    PR_Unlock
+** DESCRIPTION:
+**  Unlock a lock.  Unlocking an unlocked lock has undefined results.
+** INPUTS:      PRLock *lock
+**              Lock to unlocked.
+** OUTPUTS:     void
+** RETURN:      PR_STATUS
+**              Returns PR_FAILURE if the caller does not own the lock.
+***********************************************************************/
+NSPR_API(PRStatus) PR_Unlock(PRLock *lock);
+
+/***********************************************************************
+** MACRO:    PR_ASSERT_CURRENT_THREAD_OWNS_LOCK
+** DESCRIPTION:
+**  If the current thread owns |lock|, this assertion is guaranteed to
+**  succeed.  Otherwise, the behavior of this function is undefined.
+** INPUTS:      PRLock *lock
+**              Lock to assert ownership of.
+** OUTPUTS:     void
+** RETURN:      None
+***********************************************************************/
+#if defined(DEBUG) || defined(FORCE_PR_ASSERT)
+#define PR_ASSERT_CURRENT_THREAD_OWNS_LOCK(/* PrLock* */ lock) \
+    PR_AssertCurrentThreadOwnsLock(lock)
+#else
+#define PR_ASSERT_CURRENT_THREAD_OWNS_LOCK(/* PrLock* */ lock)
+#endif
+
+/* Don't call this function directly. */
+NSPR_API(void) PR_AssertCurrentThreadOwnsLock(PRLock *lock);
+
+PR_END_EXTERN_C
+
+#endif /* prlock_h___ */