pthread_barrier_destroy.c

glibc 2.9,最新版的C语言库函数

/* Copyright (C) 2002, 2007 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <[e-mail]>, 2002.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include "pthreadP.h"
#include <lowlevellock.h>

int
pthread_barrier_destroy (barrier)
     pthread_barrier_t *barrier;
{
  union sparc_pthread_barrier *ibarrier;
  int result = EBUSY;

  ibarrier = (union sparc_pthread_barrier *) barrier;

  int private = ibarrier->s.pshared ? LLL_SHARED : LLL_PRIVATE;

  lll_lock (ibarrier->b.lock, private);

  if (__builtin_expect (ibarrier->b.left == ibarrier->b.init_count, 1))
    /* The barrier is not used anymore.  */
    result = 0;
  else
    /* Still used, return with an error.  */
    lll_unlock (ibarrier->b.lock, private);

  return result;
}