nptl/pthread_barrier_init.c

   1 /* Copyright (C) 2002 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_init (barrier, attr, count)
  27      pthread_barrier_t *barrier;
  28      const pthread_barrierattr_t *attr;
  29      unsigned int count;
  30 {
  31   struct pthread_barrier *ibarrier;
  32
  33   if (__builtin_expect (count == 0, 0))
  34     return EINVAL;
  35
  36   if (attr != NULL)
  37     {
  38       struct pthread_barrierattr *iattr;
  39
  40       iattr = (struct pthread_barrierattr *) attr;
  41
  42       if (iattr->pshared != PTHREAD_PROCESS_PRIVATE
  43           && __builtin_expect (iattr->pshared != PTHREAD_PROCESS_SHARED, 0))
  44         /* Invalid attribute.  */
  45         return EINVAL;
  46     }
  47
  48   ibarrier = (struct pthread_barrier *) barrier;
  49
  50   /* Initialize the individual fields.  */
  51   ibarrier->lock = LLL_LOCK_INITIALIZER;
  52   ibarrier->left = count;
  53   ibarrier->init_count = count;
  54   ibarrier->curr_event = 0;
  55
  56   return 0;
  57 }