|
Packit |
6c4009 |
/* clock_getres -- Get the resolution of a POSIX clockid_t.
|
|
Packit |
6c4009 |
Copyright (C) 1999-2018 Free Software Foundation, Inc.
|
|
Packit |
6c4009 |
This file is part of the GNU C Library.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is free software; you can redistribute it and/or
|
|
Packit |
6c4009 |
modify it under the terms of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License as published by the Free Software Foundation; either
|
|
Packit |
6c4009 |
version 2.1 of the License, or (at your option) any later version.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
|
|
Packit |
6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit |
6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit |
6c4009 |
Lesser General Public License for more details.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
You should have received a copy of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License along with the GNU C Library; if not, see
|
|
Packit |
6c4009 |
<http://www.gnu.org/licenses/>. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#include <errno.h>
|
|
Packit |
6c4009 |
#include <stdint.h>
|
|
Packit |
6c4009 |
#include <time.h>
|
|
Packit |
6c4009 |
#include <unistd.h>
|
|
Packit |
6c4009 |
#include <sys/param.h>
|
|
Packit |
6c4009 |
#include <libc-internal.h>
|
|
Packit Bot |
0c2104 |
|
|
Packit Bot |
0c2104 |
|
|
Packit Bot |
0c2104 |
#if HP_TIMING_AVAIL
|
|
Packit Bot |
0c2104 |
static long int nsec; /* Clock frequency of the processor. */
|
|
Packit Bot |
0c2104 |
|
|
Packit Bot |
0c2104 |
static int
|
|
Packit Bot |
0c2104 |
hp_timing_getres (struct timespec *res)
|
|
Packit Bot |
0c2104 |
{
|
|
Packit Bot |
0c2104 |
if (__glibc_unlikely (nsec == 0))
|
|
Packit Bot |
0c2104 |
{
|
|
Packit Bot |
0c2104 |
hp_timing_t freq;
|
|
Packit Bot |
0c2104 |
|
|
Packit Bot |
0c2104 |
/* This can only happen if we haven't initialized the `nsec'
|
|
Packit Bot |
0c2104 |
variable yet. Do this now. We don't have to protect this
|
|
Packit Bot |
0c2104 |
code against multiple execution since all of them should
|
|
Packit Bot |
0c2104 |
lead to the same result. */
|
|
Packit Bot |
0c2104 |
freq = __get_clockfreq ();
|
|
Packit Bot |
0c2104 |
if (__glibc_unlikely (freq == 0))
|
|
Packit Bot |
0c2104 |
/* Something went wrong. */
|
|
Packit Bot |
0c2104 |
return -1;
|
|
Packit Bot |
0c2104 |
|
|
Packit Bot |
0c2104 |
nsec = MAX (UINT64_C (1000000000) / freq, 1);
|
|
Packit Bot |
0c2104 |
}
|
|
Packit Bot |
0c2104 |
|
|
Packit Bot |
0c2104 |
/* Fill in the values.
|
|
Packit Bot |
0c2104 |
The seconds are always zero (unless we have a 1Hz machine). */
|
|
Packit Bot |
0c2104 |
res->tv_sec = 0;
|
|
Packit Bot |
0c2104 |
res->tv_nsec = nsec;
|
|
Packit Bot |
0c2104 |
|
|
Packit Bot |
0c2104 |
return 0;
|
|
Packit Bot |
0c2104 |
}
|
|
Packit Bot |
0c2104 |
#endif
|
|
Packit Service |
3e830d |
|
|
Packit |
6c4009 |
static inline int
|
|
Packit |
6c4009 |
realtime_getres (struct timespec *res)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
long int clk_tck = __sysconf (_SC_CLK_TCK);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (__glibc_likely (clk_tck != -1))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* This implementation assumes that the realtime clock has a
|
|
Packit |
6c4009 |
resolution higher than 1 second. This is the case for any
|
|
Packit |
6c4009 |
reasonable implementation. */
|
|
Packit |
6c4009 |
res->tv_sec = 0;
|
|
Packit |
6c4009 |
res->tv_nsec = 1000000000 / clk_tck;
|
|
Packit |
6c4009 |
return 0;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return -1;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Get resolution of clock. */
|
|
Packit |
6c4009 |
int
|
|
Packit |
6c4009 |
__clock_getres (clockid_t clock_id, struct timespec *res)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
int retval = -1;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
switch (clock_id)
|
|
Packit |
6c4009 |
{
|
|
Packit Bot |
0c2104 |
#ifdef SYSDEP_GETRES
|
|
Packit Bot |
0c2104 |
SYSDEP_GETRES;
|
|
Packit Bot |
0c2104 |
#endif
|
|
Packit Bot |
0c2104 |
|
|
Packit Bot |
0c2104 |
#ifndef HANDLED_REALTIME
|
|
Packit |
6c4009 |
case CLOCK_REALTIME:
|
|
Packit |
6c4009 |
retval = realtime_getres (res);
|
|
Packit |
6c4009 |
break;
|
|
Packit Bot |
0c2104 |
#endif /* handled REALTIME */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
default:
|
|
Packit Bot |
0c2104 |
#ifdef SYSDEP_GETRES_CPU
|
|
Packit Bot |
0c2104 |
SYSDEP_GETRES_CPU;
|
|
Packit Bot |
0c2104 |
#endif
|
|
Packit Bot |
0c2104 |
#if HP_TIMING_AVAIL
|
|
Packit Bot |
0c2104 |
if ((clock_id & ((1 << CLOCK_IDFIELD_SIZE) - 1))
|
|
Packit Bot |
0c2104 |
== CLOCK_THREAD_CPUTIME_ID)
|
|
Packit Bot |
0c2104 |
retval = hp_timing_getres (res);
|
|
Packit Bot |
0c2104 |
else
|
|
Packit Bot |
0c2104 |
#endif
|
|
Packit Bot |
0c2104 |
__set_errno (EINVAL);
|
|
Packit Service |
3e830d |
break;
|
|
Packit Bot |
0c2104 |
|
|
Packit Bot |
0c2104 |
#if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME
|
|
Packit Bot |
0c2104 |
case CLOCK_PROCESS_CPUTIME_ID:
|
|
Packit Bot |
0c2104 |
case CLOCK_THREAD_CPUTIME_ID:
|
|
Packit Bot |
0c2104 |
retval = hp_timing_getres (res);
|
|
Packit Bot |
0c2104 |
break;
|
|
Packit Bot |
0c2104 |
#endif
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return retval;
|
|
Packit |
6c4009 |
}
|
|
Packit Bot |
0c2104 |
weak_alias (__clock_getres, clock_getres)
|