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glibc  2.9
pthread_barrier_destroy.c
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00001 /* Copyright (C) 2002, 2007 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 #include <lowlevellock.h>
00023 
00024 int
00025 pthread_barrier_destroy (barrier)
00026      pthread_barrier_t *barrier;
00027 {
00028   union sparc_pthread_barrier *ibarrier;
00029   int result = EBUSY;
00030 
00031   ibarrier = (union sparc_pthread_barrier *) barrier;
00032 
00033   int private = ibarrier->s.pshared ? LLL_SHARED : LLL_PRIVATE;
00034 
00035   lll_lock (ibarrier->b.lock, private);
00036 
00037   if (__builtin_expect (ibarrier->b.left == ibarrier->b.init_count, 1))
00038     /* The barrier is not used anymore.  */
00039     result = 0;
00040   else
00041     /* Still used, return with an error.  */
00042     lll_unlock (ibarrier->b.lock, private);
00043 
00044   return result;
00045 }