mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-17 02:20:10 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/* Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <errno.h>
|
|
#include <stdint.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
#include <sys/param.h>
|
|
#include <libc-internal.h>
|
|
|
|
|
|
#if HP_TIMING_AVAIL
|
|
/* Clock frequency of the processor. */
|
|
static long int nsec;
|
|
#endif
|
|
|
|
|
|
/* Get resolution of clock. */
|
|
int
|
|
clock_getres (clockid_t clock_id, struct timespec *res)
|
|
{
|
|
int retval = -1;
|
|
|
|
switch (clock_id)
|
|
{
|
|
case CLOCK_REALTIME:
|
|
{
|
|
long int clk_tck = sysconf (_SC_CLK_TCK);
|
|
|
|
if (__builtin_expect (clk_tck != -1, 1))
|
|
{
|
|
/* This implementation assumes that the realtime clock has a
|
|
resolution higher than 1 second. This is the case for any
|
|
reasonable implementation. */
|
|
res->tv_sec = 0;
|
|
res->tv_nsec = 1000000000 / clk_tck;
|
|
|
|
retval = 0;
|
|
}
|
|
}
|
|
break;
|
|
|
|
#if HP_TIMING_AVAIL
|
|
case CLOCK_PROCESS_CPUTIME_ID:
|
|
case CLOCK_THREAD_CPUTIME_ID:
|
|
{
|
|
if (__builtin_expect (nsec == 0, 0))
|
|
{
|
|
hp_timing_t freq;
|
|
|
|
/* This can only happen if we haven't initialized the `freq'
|
|
variable yet. Do this now. We don't have to protect this
|
|
code against multiple execution since all of them should
|
|
lead to the same result. */
|
|
freq = __get_clockfreq ();
|
|
if (__builtin_expect (freq == 0, 0))
|
|
/* Something went wrong. */
|
|
break;
|
|
|
|
nsec = MAX (UINT64_C (1000000000) / freq, 1);
|
|
}
|
|
|
|
/* File in the values. The seconds are always zero (unless we
|
|
have a 1Hz machine). */
|
|
res->tv_sec = 0;
|
|
res->tv_nsec = nsec;
|
|
|
|
retval = 0;
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
__set_errno (EINVAL);
|
|
break;
|
|
}
|
|
|
|
return retval;
|
|
}
|