+/* $Id$ */
+/* xbt/xbt_portability.h -- all system dependency */
+/* Private portability layer */
+/* Copyright (c) 2004,2005 Martin Quinson. All rights reserved. */
-double xbt_os_time(void);
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#ifndef _XBT_PORTABILITY_H
+#define _XBT_PORTABILITY_H
+
+#include <xbt/misc.h> /* XBT_PUBLIC */
+
+/** @brief get time in seconds
+
+ * gives the number of seconds since the Epoch (00:00:00 UTC, January 1, 1970).
+ * Most users should use gras_os_time and should not use this function unless
+ they really know what they are doing. */
+XBT_PUBLIC double xbt_os_time(void);
+
+typedef struct s_xbt_os_timer *xbt_os_timer_t;
+XBT_PUBLIC xbt_os_timer_t xbt_os_timer_new(void);
+XBT_PUBLIC void xbt_os_timer_free(xbt_os_timer_t timer);
+XBT_PUBLIC void xbt_os_timer_start(xbt_os_timer_t timer);
+XBT_PUBLIC void xbt_os_timer_stop(xbt_os_timer_t timer);
+XBT_PUBLIC double xbt_os_timer_elapsed(xbt_os_timer_t timer);
+
+#endif