109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/* Copyright (C) 1999, 2000, 2001, 2002 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 <time.h>
|
|
#include <sys/time.h>
|
|
#include <libc-internal.h>
|
|
#include <ldsodefs.h>
|
|
|
|
|
|
#if HP_TIMING_AVAIL
|
|
/* 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 (hp_timing_t offset)
|
|
__attribute__ ((__weak__));
|
|
#endif
|
|
|
|
|
|
/* Set CLOCK to value TP. */
|
|
int
|
|
clock_settime (clockid_t clock_id, const struct timespec *tp)
|
|
{
|
|
struct timeval tv;
|
|
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)
|
|
{
|
|
case CLOCK_REALTIME:
|
|
TIMESPEC_TO_TIMEVAL (&tv, tp);
|
|
|
|
retval = settimeofday (&tv, NULL);
|
|
break;
|
|
|
|
#if HP_TIMING_AVAIL
|
|
case CLOCK_PROCESS_CPUTIME_ID:
|
|
case CLOCK_THREAD_CPUTIME_ID:
|
|
{
|
|
hp_timing_t tsc;
|
|
hp_timing_t usertime;
|
|
|
|
/* First thing is to get the current time. */
|
|
HP_TIMING_NOW (tsc);
|
|
|
|
if (__builtin_expect (freq == 0, 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 (__builtin_expect (freq == 0, 0))
|
|
{
|
|
/* Something went wrong. */
|
|
retval = -1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* 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_THREAD_CPUTIME_ID
|
|
|| __pthread_clock_settime == NULL)
|
|
GL(dl_cpuclock_offset) = tsc - usertime;
|
|
else
|
|
__pthread_clock_settime (tsc - usertime);
|
|
|
|
retval = 0;
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
__set_errno (EINVAL);
|
|
retval = -1;
|
|
break;
|
|
}
|
|
|
|
return retval;
|
|
}
|