+/* xbt/time.h -- Time tools */
+/* Usable in simulator, (or in real life when mixing with GRAS) */
+
+/* Copyright (c) 2007 Martin Quinson. All rights reserved. */
+
+/* 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. */
+
+#include "xbt/misc.h" /* SG_BEGIN_DECL */
+
+SG_BEGIN_DECL()
+
+/**
+ *
+ * Time management functions, returns the system time or sleeps a process. They work both on the simulated and real systems(GRAS).
+ */
+
+XBT_PUBLIC(double) xbt_os_time(void);
+XBT_PUBLIC(void) xbt_os_sleep(double sec);
+
+SG_END_DECL()