mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
2f4f3bd4a9
* sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h: New file. * sysdeps/unix/sysv/linux/clock_getcpuclockid.c: New file. * sysdeps/unix/sysv/linux/ia64/clock_getcpuclockid.c (HAS_CPUCLOCK): New macro. (clock_getcpuclockid): Function removed. #include the new linux file to define it instead. * sysdeps/unix/clock_gettime.c [HP_TIMING_AVAIL] (hp_timing_gettime): New function, broken out of ... (clock_gettime) [HP_TIMING_AVAIL]: ... here. Call it. (realtime_gettime): New function, broken out of ... (clock_gettime) [! HANDLED_REALTIME]: ... here. Call it. (clock_gettime) [SYSDEP_GETTIME_CPU]: Use new macro in default case. * sysdeps/unix/sysv/linux/clock_gettime.c (SYSCALL_GETTIME): New macro. (SYSDEP_GETTIME_CPUTIME): New macro. (SYSDEP_GETTIME): Use both. [! __ASSUME_POSIX_TIMERS] (maybe_syscall_gettime): New function, broken out of ... (SYSDEP_GETTIME): ... here. Use it. [__NR_clock_gettime] (HANDLED_CPUTIME): Define it. (SYSDEP_GETTIME_CPUTIME): New macro. Handle CPU timers by trying kernel support and falling back to hp-timing code. * sysdeps/posix/clock_getres.c [HP_TIMING_AVAIL] (hp_timing_getres): New function, broken out of ... (clock_getres) [HP_TIMING_AVAIL]: ... here. Call it. (realtime_getres): New function, broken out of ... (clock_getres) [! HANDLED_REALTIME]: ... here. Call it. (clock_getres) [SYSDEP_GETRES_CPU]: Use new macro in default case. * sysdeps/unix/sysv/linux/clock_getres.c (SYSCALL_GETRES): New macro. (SYSDEP_GETRES_CPUTIME): New macro. (SYSDEP_GETRES): Use both. [! __ASSUME_POSIX_TIMERS] (maybe_syscall_getres): New function, broken out of ... (SYSDEP_GETRES): ... here. Use it. [__NR_clock_getres] (HANDLED_CPUTIME): Define it. (SYSDEP_GETRES_CPUTIME): New macro. Handle CPU timers by trying kernel support and falling back to hp-timing code. * sysdeps/unix/sysv/linux/clock_nanosleep.c: Handle CLOCK_PROCESS_CPUTIME_ID and CLOCK_PROCESS_THREAD_ID specially, translating to the kernel clockid_t for our own process/thread clock.
119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/* clock_getres -- Get the resolution of a POSIX clockid_t.
|
|
Copyright (C) 1999, 2000, 2001, 2003, 2004 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
|
|
static long int nsec; /* Clock frequency of the processor. */
|
|
|
|
static inline int
|
|
hp_timing_getres (struct timespec *res)
|
|
{
|
|
if (__builtin_expect (nsec == 0, 0))
|
|
{
|
|
hp_timing_t freq;
|
|
|
|
/* This can only happen if we haven't initialized the `nsec'
|
|
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. */
|
|
return -1;
|
|
|
|
nsec = MAX (UINT64_C (1000000000) / freq, 1);
|
|
}
|
|
|
|
/* Fill in the values.
|
|
The seconds are always zero (unless we have a 1Hz machine). */
|
|
res->tv_sec = 0;
|
|
res->tv_nsec = nsec;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static inline int
|
|
realtime_getres (struct timespec *res)
|
|
{
|
|
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;
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
|
|
/* Get resolution of clock. */
|
|
int
|
|
clock_getres (clockid_t clock_id, struct timespec *res)
|
|
{
|
|
int retval = -1;
|
|
|
|
switch (clock_id)
|
|
{
|
|
#ifdef SYSDEP_GETRES
|
|
SYSDEP_GETRES;
|
|
#endif
|
|
|
|
#ifndef HANDLED_REALTIME
|
|
case CLOCK_REALTIME:
|
|
retval = realtime_getres (res);
|
|
break;
|
|
#endif /* handled REALTIME */
|
|
|
|
default:
|
|
#ifdef SYSDEP_GETRES_CPU
|
|
SYSDEP_GETRES_CPU;
|
|
#endif
|
|
#if HP_TIMING_AVAIL
|
|
if ((clock_id & ((1 << CLOCK_IDFIELD_SIZE) - 1))
|
|
== CLOCK_THREAD_CPUTIME_ID)
|
|
retval = hp_timing_getres (res);
|
|
else
|
|
#endif
|
|
__set_errno (EINVAL);
|
|
break;
|
|
|
|
#if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME
|
|
case CLOCK_PROCESS_CPUTIME_ID:
|
|
case CLOCK_THREAD_CPUTIME_ID:
|
|
retval = hp_timing_getres (res);
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
return retval;
|
|
}
|