nptl/pthread_barrier_destroy.c

   1 /* Copyright (C) 2002, 2007 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include "pthreadP.h"
  22 #include <lowlevellock.h>
  23
  24
  25 int
  26 pthread_barrier_destroy (barrier)
  27      pthread_barrier_t *barrier;
  28 {
  29   struct pthread_barrier *ibarrier;
  30   int result = EBUSY;
  31
  32   ibarrier = (struct pthread_barrier *) barrier;
  33
  34   lll_lock (ibarrier->lock, ibarrier->private ^ FUTEX_PRIVATE_FLAG);
  35
  36   if (__builtin_expect (ibarrier->left == ibarrier->init_count, 1))
  37     /* The barrier is not used anymore.  */
  38     result = 0;
  39   else
  40     /* Still used, return with an error.  */
  41     lll_unlock (ibarrier->lock, ibarrier->private ^ FUTEX_PRIVATE_FLAG);
  42
  43   return result;
  44 }