nptl/pthread_rwlockattr_setkind_np.c

   1 /* Copyright (C) 2002-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include "pthreadP.h"
  21
  22
  23 int
  24 pthread_rwlockattr_setkind_np (pthread_rwlockattr_t *attr, int pref)
  25 {
  26   struct pthread_rwlockattr *iattr;
  27
  28   if (pref != PTHREAD_RWLOCK_PREFER_READER_NP
  29       && pref != PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
  30       && __builtin_expect  (pref != PTHREAD_RWLOCK_PREFER_WRITER_NP, 0))
  31     return EINVAL;
  32
  33   iattr = (struct pthread_rwlockattr *) attr;
  34
  35   iattr->lockkind = pref;
  36
  37   return 0;
  38 }