Implement real timers to avoid rounding errors when using only current time encoded...

[simgrid.git] / src / xbt / sysdep.c

diff --git a/src/xbt/sysdep.c b/src/xbt/sysdep.c
index 0734456..6f6aea8 100644 (file)
--- a/src/xbt/sysdep.c
+++ b/src/xbt/sysdep.c
@@ -1,27 +1,76 @@
 /* $Id$ */
 
 /* $Id$ */
 

-/* gras/sysdep.h -- all system dependency                                   */
+/* sysdep.c -- all system dependency                                        */

 /*  no system header should be loaded out of this file so that we have only */
 /*  one file to check when porting to another OS                            */
 
 /*  no system header should be loaded out of this file so that we have only */
 /*  one file to check when porting to another OS                            */
 

-/* Authors: Martin Quinson                                                  */
-/* Copyright (C) 2004 the OURAGAN project.                                  */
+/* Copyright (c) 2004 Martin Quinson. All rights reserved.                  */

 
 /* This program is free software; you can redistribute it and/or modify it
 
 /* 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. */
+ * under the terms of the license (GNU LGPL) which comes with this package. */

 
 #include "xbt/sysdep.h"
 
 #include "xbt/sysdep.h"

+#include "xbt/xbt_portability.h" /* private */

 #include "xbt/log.h"
 #include "xbt/error.h"
 #include "xbt/log.h"
 #include "xbt/error.h"

+#include "portable.h"

 
 

-#include <stdlib.h>

 
 

-GRAS_LOG_NEW_DEFAULT_SUBCATEGORY(sysdep, xbt, "System dependency");
+/* TSC (tick-level) timers are said to be unreliable on SMP hosts and thus 
+   disabled in SDL source code */ 

 
 

-/****
- **** Misc
- ****/

 
 

-void gras_abort(void) {
-   abort();
+/* \defgroup XBT_sysdep All system dependency
+ * \brief This section describes many macros/functions that can serve as
+ *  an OS abstraction.
+ */
+
+double xbt_os_time(void) {
+#ifdef HAVE_GETTIMEOFDAY
+  struct timeval tv;
+
+  gettimeofday(&tv, NULL);
+
+  return (double)(tv.tv_sec + tv.tv_usec / 1000000.0);
+#else
+  /* Poor resolution */
+  return (double)(time(NULL));
+#endif /* HAVE_GETTIMEOFDAY? */        

 }
 }

+
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sysdep, xbt, "System dependency");
+
+
+struct s_xbt_os_timer {
+#ifdef HAVE_GETTIMEOFDAY
+   struct timeval start,stop;
+#else
+   unsigned long int start,stop;
+#endif
+};
+
+xbt_os_timer_t xbt_os_timer_new(void) {
+   return xbt_new0(struct s_xbt_os_timer,1);
+}
+void xbt_os_timer_free(xbt_os_timer_t timer) {
+   free (timer);
+}
+void xbt_os_timer_start(xbt_os_timer_t timer) {
+#ifdef HAVE_GETTIMEOFDAY
+  gettimeofday(&(timer->start), NULL);
+#else 
+  timer->start = (unsigned long int)(time(NULL));
+#endif
+}
+void xbt_os_timer_stop(xbt_os_timer_t timer) {
+#ifdef HAVE_GETTIMEOFDAY
+  gettimeofday(&(timer->stop), NULL);
+#else 
+  timer->stop = (unsigned long int)(time(NULL));
+#endif
+}
+double xbt_os_timer_elapsed(xbt_os_timer_t timer) {
+   return  ((double)timer->stop.tv_sec)  - ((double)timer->start.tv_sec) +
+         ((((double)timer->stop.tv_usec) - ((double)timer->start.tv_usec)) / 1000000.0);
+}
+