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glibc  2.9
pthread_mutexattr_setrobust.c
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00001 /* Copyright (C) 2005 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2005.
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_mutexattr_setrobust_np (attr, robustness)
00026      pthread_mutexattr_t *attr;
00027      int robustness;
00028 {
00029   if (robustness != PTHREAD_MUTEX_STALLED_NP
00030       && __builtin_expect (robustness != PTHREAD_MUTEX_ROBUST_NP, 0))
00031     return EINVAL;
00032 
00033   struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr;
00034 
00035   /* We use bit 30 to signal whether the mutex is going to be
00036      robust or not.  */
00037   if (robustness == PTHREAD_MUTEX_STALLED_NP)
00038     iattr->mutexkind &= ~PTHREAD_MUTEXATTR_FLAG_ROBUST;
00039   else
00040     iattr->mutexkind |= PTHREAD_MUTEXATTR_FLAG_ROBUST;
00041 
00042   return 0;
00043 }