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61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
/* Copyright (C) 2002-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include "pthreadP.h"
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#include <futex-internal.h>
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#include <kernel-features.h>
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static const struct pthread_barrierattr default_barrierattr =
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{
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.pshared = PTHREAD_PROCESS_PRIVATE
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};
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int
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__pthread_barrier_init (pthread_barrier_t *barrier,
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const pthread_barrierattr_t *attr, unsigned int count)
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{
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struct pthread_barrier *ibarrier;
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/* XXX EINVAL is not specified by POSIX as a possible error code for COUNT
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being too large. See pthread_barrier_wait for the reason for the
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comparison with BARRIER_IN_THRESHOLD. */
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if (__glibc_unlikely (count == 0 || count >= BARRIER_IN_THRESHOLD))
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return EINVAL;
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const struct pthread_barrierattr *iattr
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= (attr != NULL
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? (struct pthread_barrierattr *) attr
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: &default_barrierattr);
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ibarrier = (struct pthread_barrier *) barrier;
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/* Initialize the individual fields. */
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ibarrier->in = 0;
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ibarrier->out = 0;
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ibarrier->count = count;
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ibarrier->current_round = 0;
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ibarrier->shared = (iattr->pshared == PTHREAD_PROCESS_PRIVATE
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? FUTEX_PRIVATE : FUTEX_SHARED);
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return 0;
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}
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weak_alias (__pthread_barrier_init, pthread_barrier_init)
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