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diff --git a/sal/inc/internal/once.h b/sal/inc/internal/once.h
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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef INCLUDED_SAL_INTERNAL_ONCE_H
+#define INCLUDED_SAL_INTERNAL_ONCE_H
+
+/** sal_once_type
+ *  (platform dependent)
+ */
+
+#if defined(SAL_UNX) || defined(SAL_OS2)
+
+#include <pthread.h>
+
+typedef pthread_once_t sal_once_type;
+
+#define SAL_ONCE_INIT PTHREAD_ONCE_INIT
+#define SAL_ONCE(once, init) pthread_once((once), (init))
+
+#elif defined(SAL_W32)
+
+#define WIN32_LEAN_AND_MEAN
+#pragma warning(push,1) /* disable warnings within system headers */
+#include <windows.h>
+#pragma warning(pop)
+
+typedef struct sal_once_st sal_once_type;
+struct sal_once_st
+{
+    LONG volatile m_done;
+    LONG volatile m_lock;
+};
+
+#define SAL_ONCE_INIT { 0, 0 }
+#define SAL_ONCE(once, init) \
+{ \
+    sal_once_type * control = (once); \
+    if (!(control->m_done)) \
+    { \
+        while (InterlockedExchange(&(control->m_lock), 1) == 1) Sleep(0); \
+        if (!(control->m_done)) \
+        { \
+            void (*init_routine)(void) = (init); \
+            (*init_routine)(); \
+            control->m_done = 1; \
+        } \
+        InterlockedExchange(&(control->m_lock), 0); \
+    } \
+}
+
+#else
+#error Unknown platform
+#endif /* SAL_UNX | SAL_W32 */
+
+#endif /* INCLUDED_SAL_INTERNAL_ONCE_H */