nptl/sysdeps/unix/sysv/linux/sparc/pthread_barrier_init.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 int
  24 pthread_barrier_init (barrier, attr, count)
  25      pthread_barrier_t *barrier;
  26      const pthread_barrierattr_t *attr;
  27      unsigned int count;
  28 {
  29   union sparc_pthread_barrier *ibarrier;
  30
  31   if (__glibc_unlikely (count == 0))
  32     return EINVAL;
  33
  34   struct pthread_barrierattr *iattr = (struct pthread_barrierattr *) attr;
  35   if (iattr != NULL)
  36     {
  37       if (iattr->pshared != PTHREAD_PROCESS_PRIVATE
  38           && __builtin_expect (iattr->pshared != PTHREAD_PROCESS_SHARED, 0))
  39         /* Invalid attribute.  */
  40         return EINVAL;
  41     }
  42
  43   ibarrier = (union sparc_pthread_barrier *) barrier;
  44
  45   /* Initialize the individual fields.  */
  46   ibarrier->b.lock = LLL_LOCK_INITIALIZER;
  47   ibarrier->b.left = count;
  48   ibarrier->b.init_count = count;
  49   ibarrier->b.curr_event = 0;
  50   ibarrier->s.left_lock = 0;
  51   ibarrier->s.pshared = (iattr && iattr->pshared == PTHREAD_PROCESS_SHARED);
  52
  53   return 0;
  54 }