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