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glibc  2.9
pthread_rwlockattr_setkind_np.c
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00001 /* Copyright (C) 2002 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include "pthreadP.h"
00022 
00023 
00024 int
00025 pthread_rwlockattr_setkind_np (attr, pref)
00026      pthread_rwlockattr_t *attr;
00027      int pref;
00028 {
00029   struct pthread_rwlockattr *iattr;
00030 
00031   if (pref != PTHREAD_RWLOCK_PREFER_READER_NP
00032       && pref != PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
00033       && __builtin_expect  (pref != PTHREAD_RWLOCK_PREFER_WRITER_NP, 0))
00034     return EINVAL;
00035 
00036   iattr = (struct pthread_rwlockattr *) attr;
00037 
00038   iattr->lockkind = pref;
00039 
00040   return 0;
00041 }