3 * Function execution timer.
5 * GiNaC Copyright (C) 1999 Johannes Gutenberg University Mainz, Germany
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <sys/resource.h>
27 // fcntimer() is a little wrapper around GiNaC's automated checks. All those
28 // functions are passed void and return unsigned. fcntimer() accepts one such
29 // function fcn(), returns its result and as a side-effect prints to stdout how
30 // much CPU time was consumed by fcn's execution in the fashion "(0.07s)\n".
31 unsigned fcntimer(unsigned fcn())
34 struct rusage used1, used2;
37 // time the execution of the function:
38 getrusage(RUSAGE_SELF, &used1);
40 getrusage(RUSAGE_SELF, &used2);
42 // add elapsed user and system time in microseconds:
43 elapsed = ((used2.ru_utime.tv_sec - used1.ru_utime.tv_sec) +
44 (used2.ru_stime.tv_sec - used1.ru_stime.tv_sec) +
45 (used2.ru_utime.tv_usec - used1.ru_utime.tv_usec) / 1e6 +
46 (used2.ru_stime.tv_usec - used1.ru_stime.tv_usec) / 1e6);
48 printf("(%.2fs)\n", elapsed);