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diff --git a/mozilla/nsprpub/pr/src/md/os2/os2emx.s b/mozilla/nsprpub/pr/src/md/os2/os2emx.s
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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) 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 *****
+
+/ PRInt32 __PR_MD_ATOMIC_INCREMENT(PRInt32 *val)
+/
+/ Atomically increment the integer pointed to by 'val' and return
+/ the result of the increment.
+/
+    .text
+    .globl __PR_MD_ATOMIC_INCREMENT
+    .align 4
+__PR_MD_ATOMIC_INCREMENT:
+    movl 4(%esp), %ecx
+    movl $1, %eax
+    lock
+    xaddl %eax, (%ecx)
+    incl %eax
+    ret
+
+/ PRInt32 __PR_MD_ATOMIC_DECREMENT(PRInt32 *val)
+/
+/ Atomically decrement the integer pointed to by 'val' and return
+/ the result of the decrement.
+/
+    .text
+    .globl __PR_MD_ATOMIC_DECREMENT
+    .align 4
+__PR_MD_ATOMIC_DECREMENT:
+    movl 4(%esp), %ecx
+    movl $-1, %eax
+    lock
+    xaddl %eax, (%ecx)
+    decl %eax
+    ret
+
+/ PRInt32 __PR_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
+/
+/ Atomically set the integer pointed to by 'val' to the new
+/ value 'newval' and return the old value.
+/
+/ An alternative implementation:
+/   .text
+/   .globl __PR_MD_ATOMIC_SET
+/   .align 4
+/__PR_MD_ATOMIC_SET:
+/   movl 4(%esp), %ecx
+/   movl 8(%esp), %edx
+/   movl (%ecx), %eax
+/retry:
+/   lock
+/   cmpxchgl %edx, (%ecx)
+/   jne retry
+/   ret
+/
+    .text
+    .globl __PR_MD_ATOMIC_SET
+    .align 4
+__PR_MD_ATOMIC_SET:
+    movl 4(%esp), %ecx
+    movl 8(%esp), %eax
+    xchgl %eax, (%ecx)
+    ret
+
+/ PRInt32 __PR_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
+/
+/ Atomically add 'val' to the integer pointed to by 'ptr'
+/ and return the result of the addition.
+/
+    .text
+    .globl __PR_MD_ATOMIC_ADD
+    .align 4
+__PR_MD_ATOMIC_ADD:
+    movl 4(%esp), %ecx
+    movl 8(%esp), %eax
+    movl %eax, %edx
+    lock
+    xaddl %eax, (%ecx)
+    addl %edx, %eax
+    ret