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/* Copyright (C) 2002-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 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, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include "pthreadP.h"
#include <futex-internal.h>
#include <kernel-features.h>
static const struct pthread_barrierattr default_barrierattr =
{
.pshared = PTHREAD_PROCESS_PRIVATE
};
int
__pthread_barrier_init (pthread_barrier_t *barrier,
const pthread_barrierattr_t *attr, unsigned int count)
{
struct pthread_barrier *ibarrier;
/* XXX EINVAL is not specified by POSIX as a possible error code for COUNT
being too large. See pthread_barrier_wait for the reason for the
comparison with BARRIER_IN_THRESHOLD. */
if (__glibc_unlikely (count == 0 || count >= BARRIER_IN_THRESHOLD))
return EINVAL;
const struct pthread_barrierattr *iattr
= (attr != NULL
? (struct pthread_barrierattr *) attr
: &default_barrierattr);
ibarrier = (struct pthread_barrier *) barrier;
/* Initialize the individual fields. */
ibarrier->in = 0;
ibarrier->out = 0;
ibarrier->count = count;
ibarrier->current_round = 0;
ibarrier->shared = (iattr->pshared == PTHREAD_PROCESS_PRIVATE
? FUTEX_PRIVATE : FUTEX_SHARED);
return 0;
}
weak_alias (__pthread_barrier_init, pthread_barrier_init)
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