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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 
00025 int
00026 pthread_barrier_destroy (barrier)
00027      pthread_barrier_t *barrier;
00028 {
00029   struct pthread_barrier *ibarrier;
00030   int result = EBUSY;
00031 
00032   ibarrier = (struct pthread_barrier *) barrier;
00033 
00034   lll_lock (ibarrier->lock, ibarrier->private ^ FUTEX_PRIVATE_FLAG);
00035 
00036   if (__builtin_expect (ibarrier->left == ibarrier->init_count, 1))
00037     /* The barrier is not used anymore.  */
00038     result = 0;
00039   else
00040     /* Still used, return with an error.  */
00041     lll_unlock (ibarrier->lock, ibarrier->private ^ FUTEX_PRIVATE_FLAG);
00042 
00043   return result;
00044 }