/* Copyright (C) 2003-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.

   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 <pthread.h>

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

#include <unistd.h>

#if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0

static pthread_barrier_t b2;

static pthread_barrier_t bN;

static void *

tf (void *arg)

{

  int e = pthread_barrier_wait (&b2;;

  if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)

    {

      puts ("barrier_wait failed");

      exit (1);

    }

  e = pthread_barrier_wait (&bN);

  if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)

    {

      puts ("barrier_wait failed");

      exit (1);

    }

  return NULL;

}

#endif

int

do_test (void)

{

#if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0

# define N 10

# if _POSIX_THREAD_CPUTIME == 0

  if (sysconf (_SC_THREAD_CPUTIME) < 0)

    {

      puts ("_POSIX_THREAD_CPUTIME option not available");

      return 0;

    }

# endif

  if (pthread_barrier_init (&b2, NULL, 2) != 0

      || pthread_barrier_init (&bN, NULL, N + 1) != 0)

    {

      puts ("barrier_init failed");

      return 1;

    }

  struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 };

  TEMP_FAILURE_RETRY (nanosleep (&ts, &ts);;

  pthread_t th[N + 1];

  clockid_t cl[N + 1];

# ifndef CLOCK_THREAD_CPUTIME_ID

  if (pthread_getcpuclockid (pthread_self (), &cl[0]) != 0)

    {

      puts ("own pthread_getcpuclockid failed");

      return 1;

    }

# else

  cl[0] = CLOCK_THREAD_CPUTIME_ID;

# endif

  pthread_attr_t at;

  if (pthread_attr_init (&at) != 0)

    {

      puts ("attr_init failed");

      return 1;

    }

  if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)

    {

      puts ("attr_setstacksize failed");

      return 1;

    }

  int i;

  int e;

  for (i = 0; i < N; ++i)

    {

      if (pthread_create (&th[i], &at, tf, NULL) != 0)

	{

	  puts ("create failed");

	  return 1;

	}

      e = pthread_barrier_wait (&b2;;

      if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)

	{

	  puts ("barrier_wait failed");

	  return 1;

	}

      ts.tv_sec = 0;

      ts.tv_nsec = 100000000;

      TEMP_FAILURE_RETRY (nanosleep (&ts, &ts);;

      if (pthread_getcpuclockid (th[i], &cl[i + 1]) != 0)

	{

	  puts ("pthread_getcpuclockid failed");

	  return 1;

	}

    }

  if (pthread_attr_destroy (&at) != 0)

    {

      puts ("attr_destroy failed");

      return 1;

    }

  struct timespec t[N + 1];

  for (i = 0; i < N + 1; ++i)

    if (clock_gettime (cl[i], &t[i]) != 0)

      {

	printf ("clock_gettime round %d failed\n", i);

	return 1;

      }

  for (i = 0; i < N; ++i)

    {

      struct timespec diff;

      diff.tv_sec = t[i].tv_sec - t[i + 1].tv_sec;

      diff.tv_nsec = t[i].tv_nsec - t[i + 1].tv_nsec;

      if (diff.tv_nsec < 0)

	{

	  diff.tv_nsec += 1000000000;

	  --diff.tv_sec;

	}

      if (diff.tv_sec < 0 || (diff.tv_sec == 0 && diff.tv_nsec < 100000000))

	{

	  printf ("\

difference between thread %d and %d too small (%ld.%09ld)\n",

		  i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);

	  return 1;

	}

      printf ("diff %d->%d: %ld.%09ld\n",

	      i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);

    }

  ts.tv_sec = 0;

  ts.tv_nsec = 0;

  for (i = 0; i < N + 1; ++i)

    if (clock_settime (cl[i], &ts) != 0)

      {

	printf ("clock_settime(%d) round %d failed\n", cl[i], i);

	return 1;

      }

  for (i = 0; i < N + 1; ++i)

    {

      if (clock_gettime (cl[i], &ts) != 0)

	{

	  puts ("clock_gettime failed");

	  return 1;

	}

      if (ts.tv_sec > t[i].tv_sec

	  || (ts.tv_sec == t[i].tv_sec && ts.tv_nsec > t[i].tv_nsec))

	{

	  puts ("clock_settime didn't reset clock");

	  return 1;

	}

    }

#endif

  return 0;

}

#define TEST_FUNCTION do_test ()

#include "../test-skeleton.c"