nptl/pthread_rwlockattr_setkind_np.c

   1 /* Copyright (C) 2002 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include "pthreadP.h"
  22
  23
  24 int
  25 pthread_rwlockattr_setkind_np (attr, pref)
  26      pthread_rwlockattr_t *attr;
  27      int pref;
  28 {
  29   struct pthread_rwlockattr *iattr;
  30
  31   if (pref != PTHREAD_RWLOCK_PREFER_READER_NP
  32       && pref != PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
  33       && __builtin_expect  (pref != PTHREAD_RWLOCK_PREFER_WRITER_NP, 0))
  34     return EINVAL;
  35
  36   iattr = (struct pthread_rwlockattr *) attr;
  37
  38   iattr->lockkind = pref;
  39
  40   return 0;
  41 }