Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/sysdeps/unix/clock_settime.c
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
127 lines (104 sloc)
3.29 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* Copyright (C) 1999-2016 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 <time.h> | |
#include <sys/time.h> | |
#include <libc-internal.h> | |
#include <ldsodefs.h> | |
#if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME | |
/* Clock frequency of the processor. We make it a 64-bit variable | |
because some jokers are already playing with processors with more | |
than 4GHz. */ | |
static hp_timing_t freq; | |
/* This function is defined in the thread library. */ | |
extern void __pthread_clock_settime (clockid_t clock_id, hp_timing_t offset) | |
__attribute__ ((__weak__)); | |
static int | |
hp_timing_settime (clockid_t clock_id, const struct timespec *tp) | |
{ | |
hp_timing_t tsc; | |
hp_timing_t usertime; | |
/* First thing is to get the current time. */ | |
HP_TIMING_NOW (tsc); | |
if (__glibc_unlikely (freq == 0)) | |
{ | |
/* 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 (__glibc_unlikely (freq == 0)) | |
/* Something went wrong. */ | |
return -1; | |
} | |
/* Convert the user-provided time into CPU ticks. */ | |
usertime = tp->tv_sec * freq + (tp->tv_nsec * freq) / 1000000000ull; | |
/* Determine the offset and use it as the new base value. */ | |
if (clock_id == CLOCK_PROCESS_CPUTIME_ID | |
|| __pthread_clock_settime == NULL) | |
GL(dl_cpuclock_offset) = tsc - usertime; | |
else | |
__pthread_clock_settime (clock_id, tsc - usertime); | |
return 0; | |
} | |
#endif | |
/* Set CLOCK to value TP. */ | |
int | |
__clock_settime (clockid_t clock_id, const struct timespec *tp) | |
{ | |
int retval; | |
/* Make sure the time cvalue is OK. */ | |
if (tp->tv_nsec < 0 || tp->tv_nsec >= 1000000000) | |
{ | |
__set_errno (EINVAL); | |
return -1; | |
} | |
switch (clock_id) | |
{ | |
#define HANDLE_REALTIME \ | |
do { \ | |
struct timeval tv; \ | |
TIMESPEC_TO_TIMEVAL (&tv, tp); \ | |
\ | |
retval = settimeofday (&tv, NULL); \ | |
} while (0) | |
#ifdef SYSDEP_SETTIME | |
SYSDEP_SETTIME; | |
#endif | |
#ifndef HANDLED_REALTIME | |
case CLOCK_REALTIME: | |
HANDLE_REALTIME; | |
break; | |
#endif | |
default: | |
#ifdef SYSDEP_SETTIME_CPU | |
SYSDEP_SETTIME_CPU; | |
#endif | |
#ifndef HANDLED_CPUTIME | |
# if HP_TIMING_AVAIL | |
if (CPUCLOCK_WHICH (clock_id) == CLOCK_PROCESS_CPUTIME_ID | |
|| CPUCLOCK_WHICH (clock_id) == CLOCK_THREAD_CPUTIME_ID) | |
retval = hp_timing_settime (clock_id, tp); | |
else | |
# endif | |
{ | |
__set_errno (EINVAL); | |
retval = -1; | |
} | |
#endif | |
break; | |
} | |
return retval; | |
} | |
weak_alias (__clock_settime, clock_settime) |