/* pthread_condattr_setclock.  Generic version.

   Copyright (C) 2002-2018 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 <pthread.h>

#include <pt-internal.h>

int

pthread_condattr_setclock (pthread_condattr_t *attr, clockid_t clock)

{

  /* Only a few clocks are allowed.  CLOCK_REALTIME is always allowed.

     CLOCK_MONOTONIC only if the kernel has the necessary support.  */

  if (clock == CLOCK_MONOTONIC)

    {

      /* Check whether the clock is available.  */

      static int avail;

      if (avail == 0)

	{

	  struct timespec ts;

	  int res;

	  res = clock_gettime (CLOCK_MONOTONIC, &ts);

	  avail = res < 0 ? -1 : 1;

	}

      if (avail < 0)

	/* Not available.  */

	return EINVAL;

    }

  else if (clock != CLOCK_REALTIME)

    return EINVAL;

  attr->__clock = clock;

  return 0;

}