nptl/pthread_barrier_destroy.c

   1 /* Copyright (C) 2002-2014 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include "pthreadP.h"
  21 #include <lowlevellock.h>
  22
  23
  24 int
  25 pthread_barrier_destroy (barrier)
  26      pthread_barrier_t *barrier;
  27 {
  28   struct pthread_barrier *ibarrier;
  29   int result = EBUSY;
  30
  31   ibarrier = (struct pthread_barrier *) barrier;
  32
  33   lll_lock (ibarrier->lock, ibarrier->private ^ FUTEX_PRIVATE_FLAG);
  34
  35   if (__builtin_expect (ibarrier->left == ibarrier->init_count, 1))
  36     /* The barrier is not used anymore.  */
  37     result = 0;
  38   else
  39     /* Still used, return with an error.  */
  40     lll_unlock (ibarrier->lock, ibarrier->private ^ FUTEX_PRIVATE_FLAG);
  41
  42   return result;
  43 }