sysdeps/htl/pt-barrier-init.c

   1 /* pthread_barrier_init.  Generic version.
   2    Copyright (C) 2002-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <pthread.h>
  20 #include <string.h>
  21 #include <assert.h>
  22
  23 #include <pt-internal.h>
  24
  25 int
  26 pthread_barrier_init (pthread_barrier_t *barrier,
  27                       const pthread_barrierattr_t *attr, unsigned count)
  28 {
  29   ASSERT_TYPE_SIZE (pthread_barrier_t, __SIZEOF_PTHREAD_BARRIER_T);
  30
  31   if (count == 0)
  32     return EINVAL;
  33
  34   memset (barrier, 0, sizeof *barrier);
  35
  36   barrier->__lock = PTHREAD_SPINLOCK_INITIALIZER;
  37   barrier->__pending = count;
  38   barrier->__count = count;
  39
  40   if (attr == NULL
  41       || memcmp (attr, &__pthread_default_barrierattr, sizeof (*attr)) == 0)
  42     /* Use the default attributes.  */
  43     return 0;
  44
  45   /* Non-default attributes.  */
  46
  47   barrier->__attr = malloc (sizeof *attr);
  48   if (barrier->__attr == NULL)
  49     return ENOMEM;
  50
  51   *barrier->__attr = *attr;
  52   return 0;
  53 }