/* Change priority ceiling setting in pthread_mutexattr_t.

   Copyright (C) 2006-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Jakub Jelinek <jakub@redhat.com>, 2006.

   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 <pthreadP.h>

#include <atomic.h>

int

pthread_mutexattr_setprioceiling (pthread_mutexattr_t *attr, int prioceiling)

{

  /* See __init_sched_fifo_prio.  */

  if (atomic_load_relaxed (&__sched_fifo_min_prio) == -1

      || atomic_load_relaxed (&__sched_fifo_max_prio) == -1)

    __init_sched_fifo_prio ();

  if (__glibc_unlikely (prioceiling

			< atomic_load_relaxed (&__sched_fifo_min_prio))

      || __glibc_unlikely (prioceiling

			   > atomic_load_relaxed (&__sched_fifo_max_prio))

      || __glibc_unlikely ((prioceiling

			    & (PTHREAD_MUTEXATTR_PRIO_CEILING_MASK

			       >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT))

			   != prioceiling))

    return EINVAL;

  struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr;

  iattr->mutexkind = ((iattr->mutexkind & ~PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)

		      | (prioceiling << PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT));

  return 0;

}