diff options
Diffstat (limited to 'sysdeps/posix/clock_getres.c')
-rw-r--r-- | sysdeps/posix/clock_getres.c | 118 |
1 files changed, 0 insertions, 118 deletions
diff --git a/sysdeps/posix/clock_getres.c b/sysdeps/posix/clock_getres.c deleted file mode 100644 index b6248bef2c..0000000000 --- a/sysdeps/posix/clock_getres.c +++ /dev/null @@ -1,118 +0,0 @@ -/* clock_getres -- Get the resolution of a POSIX clockid_t. - Copyright (C) 1999-2017 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, see - <http://www.gnu.org/licenses/>. */ - -#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 int -hp_timing_getres (struct timespec *res) -{ - if (__glibc_unlikely (nsec == 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 (__glibc_unlikely (freq == 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 (__glibc_likely (clk_tck != -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; -} -weak_alias (__clock_getres, clock_getres) |