Some cleanups. Add branch prediction.
[glibc/history.git] / sysdeps / posix / clock.c
blob182a1b196c6c109a82d1134a908646a871920e16
1 /* Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #include <sys/times.h>
20 #include <time.h>
22 /* Return the time used by the program so far (user time + system time). */
23 clock_t
24 clock ()
26 struct tms buf;
28 if (__times (&buf) < 0)
29 return (clock_t) -1;
31 return buf.tms_utime + buf.tms_stime;