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/* Copyright (C) 1999, 2000, 2001 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>

#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;

/* We need the starting time for the process.  */

extern hp_timing_t _dl_cpuclock_offset;

/* 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)

          _dl_cpuclock_offset = tsc - usertime;

        else

          __pthread_clock_settime (tsc - usertime);

        retval = 0;

      }

      break;

#endif

    default:

      __set_errno (EINVAL);

      retval = -1;

      break;

    }

  return retval;

}