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https://sourceware.org/git/glibc.git
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126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
/* Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <time.h>
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#include <sys/time.h>
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#include <libc-internal.h>
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#include <ldsodefs.h>
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#if HP_TIMING_AVAIL
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/* Clock frequency of the processor. We make it a 64-bit variable
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because some jokers are already playing with processors with more
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than 4GHz. */
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static hp_timing_t freq;
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/* This function is defined in the thread library. */
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extern void __pthread_clock_settime (clockid_t clock_id, hp_timing_t offset)
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__attribute__ ((__weak__));
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#endif
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/* Set CLOCK to value TP. */
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int
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clock_settime (clockid_t clock_id, const struct timespec *tp)
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{
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int retval;
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/* Make sure the time cvalue is OK. */
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if (tp->tv_nsec < 0 || tp->tv_nsec >= 1000000000)
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{
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__set_errno (EINVAL);
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return -1;
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}
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switch (clock_id)
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{
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#define HANDLE_REALTIME \
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do { \
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struct timeval tv; \
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TIMESPEC_TO_TIMEVAL (&tv, tp); \
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\
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retval = settimeofday (&tv, NULL); \
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} while (0)
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#ifdef SYSDEP_SETTIME
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SYSDEP_SETTIME;
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#endif
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#ifndef HANDLED_REALTIME
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case CLOCK_REALTIME:
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HANDLE_REALTIME;
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break;
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#endif
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default:
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#if HP_TIMING_AVAIL
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if ((clock_id & ((1 << CLOCK_IDFIELD_SIZE) - 1))
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!= CLOCK_THREAD_CPUTIME_ID)
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#endif
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{
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__set_errno (EINVAL);
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retval = -1;
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break;
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}
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#if HP_TIMING_AVAIL
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/* FALLTHROUGH. */
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case CLOCK_PROCESS_CPUTIME_ID:
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{
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hp_timing_t tsc;
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hp_timing_t usertime;
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/* First thing is to get the current time. */
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HP_TIMING_NOW (tsc);
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if (__builtin_expect (freq == 0, 0))
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{
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/* This can only happen if we haven't initialized the `freq'
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variable yet. Do this now. We don't have to protect this
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code against multiple execution since all of them should
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lead to the same result. */
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freq = __get_clockfreq ();
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if (__builtin_expect (freq == 0, 0))
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{
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/* Something went wrong. */
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retval = -1;
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break;
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}
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}
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/* Convert the user-provided time into CPU ticks. */
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usertime = tp->tv_sec * freq + (tp->tv_nsec * freq) / 1000000000ull;
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/* Determine the offset and use it as the new base value. */
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if (clock_id == CLOCK_PROCESS_CPUTIME_ID
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|| __pthread_clock_settime == NULL)
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GL(dl_cpuclock_offset) = tsc - usertime;
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else
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__pthread_clock_settime (clock_id, tsc - usertime);
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retval = 0;
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}
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break;
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#endif
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}
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return retval;
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}
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