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glibc  2.9
pthread_barrier_init.c
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00001 /* Copyright (C) 2002, 2006, 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_init (barrier, attr, count)
00026      pthread_barrier_t *barrier;
00027      const pthread_barrierattr_t *attr;
00028      unsigned int count;
00029 {
00030   union sparc_pthread_barrier *ibarrier;
00031 
00032   if (__builtin_expect (count == 0, 0))
00033     return EINVAL;
00034 
00035   struct pthread_barrierattr *iattr = (struct pthread_barrierattr *) attr;
00036   if (iattr != NULL)
00037     {
00038       if (iattr->pshared != PTHREAD_PROCESS_PRIVATE
00039          && __builtin_expect (iattr->pshared != PTHREAD_PROCESS_SHARED, 0))
00040        /* Invalid attribute.  */
00041        return EINVAL;
00042     }
00043 
00044   ibarrier = (union sparc_pthread_barrier *) barrier;
00045 
00046   /* Initialize the individual fields.  */
00047   ibarrier->b.lock = LLL_LOCK_INITIALIZER;
00048   ibarrier->b.left = count;
00049   ibarrier->b.init_count = count;
00050   ibarrier->b.curr_event = 0;
00051   ibarrier->s.left_lock = 0;
00052   ibarrier->s.pshared = (iattr && iattr->pshared == PTHREAD_PROCESS_SHARED);
00053 
00054   return 0;
00055 }