3 /* sysdep.c -- all system dependency */
4 /* no system header should be loaded out of this file so that we have only */
5 /* one file to check when porting to another OS */
7 /* Copyright (c) 2004 Martin Quinson. All rights reserved. */
9 /* This program is free software; you can redistribute it and/or modify it
10 * under the terms of the license (GNU LGPL) which comes with this package. */
12 #include "xbt/sysdep.h"
13 #include "xbt/xbt_portability.h" /* private */
18 /* TSC (tick-level) timers are said to be unreliable on SMP hosts and thus
19 disabled in SDL source code */
22 /* \defgroup XBT_sysdep All system dependency
23 * \brief This section describes many macros/functions that can serve as
27 double xbt_os_time(void) {
28 #ifdef HAVE_GETTIMEOFDAY
31 gettimeofday(&tv, NULL);
33 return (double)(tv.tv_sec + tv.tv_usec / 1000000.0);
36 return (double)(time(NULL));
37 #endif /* HAVE_GETTIMEOFDAY? */
40 /*XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sysdep, xbt, "System dependency");*/
43 struct s_xbt_os_timer {
44 #ifdef HAVE_GETTIMEOFDAY
45 struct timeval start,stop;
47 unsigned long int start,stop;
51 xbt_os_timer_t xbt_os_timer_new(void) {
52 return xbt_new0(struct s_xbt_os_timer,1);
54 void xbt_os_timer_free(xbt_os_timer_t timer) {
57 void xbt_os_timer_start(xbt_os_timer_t timer) {
58 #ifdef HAVE_GETTIMEOFDAY
59 gettimeofday(&(timer->start), NULL);
61 timer->start = (unsigned long int)(time(NULL));
64 void xbt_os_timer_stop(xbt_os_timer_t timer) {
65 #ifdef HAVE_GETTIMEOFDAY
66 gettimeofday(&(timer->stop), NULL);
68 timer->stop = (unsigned long int)(time(NULL));
71 double xbt_os_timer_elapsed(xbt_os_timer_t timer) {
72 #ifdef HAVE_GETTIMEOFDAY
73 return ((double)timer->stop.tv_sec) - ((double)timer->start.tv_sec) +
74 ((((double)timer->stop.tv_usec) - ((double)timer->start.tv_usec)) / 1000000.0);
76 return (double)timer->stop - (double)timer->start;