1/* Copyright (C) 2002-2020 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 <https://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include "pthreadP.h"
21#include <futex-internal.h>
22#include <kernel-features.h>
23
24
25static const struct pthread_barrierattr default_barrierattr =
26 {
27 .pshared = PTHREAD_PROCESS_PRIVATE
28 };
29
30
31int
32__pthread_barrier_init (pthread_barrier_t *barrier,
33 const pthread_barrierattr_t *attr, unsigned int count)
34{
35 ASSERT_TYPE_SIZE (pthread_barrier_t, __SIZEOF_PTHREAD_BARRIER_T);
36 ASSERT_PTHREAD_INTERNAL_SIZE (pthread_barrier_t,
37 struct pthread_barrier);
38
39 struct pthread_barrier *ibarrier;
40
41 /* XXX EINVAL is not specified by POSIX as a possible error code for COUNT
42 being too large. See pthread_barrier_wait for the reason for the
43 comparison with BARRIER_IN_THRESHOLD. */
44 if (__glibc_unlikely (count == 0 || count >= BARRIER_IN_THRESHOLD))
45 return EINVAL;
46
47 const struct pthread_barrierattr *iattr
48 = (attr != NULL
49 ? (struct pthread_barrierattr *) attr
50 : &default_barrierattr);
51
52 ibarrier = (struct pthread_barrier *) barrier;
53
54 /* Initialize the individual fields. */
55 ibarrier->in = 0;
56 ibarrier->out = 0;
57 ibarrier->count = count;
58 ibarrier->current_round = 0;
59 ibarrier->shared = (iattr->pshared == PTHREAD_PROCESS_PRIVATE
60 ? FUTEX_PRIVATE : FUTEX_SHARED);
61
62 return 0;
63}
64weak_alias (__pthread_barrier_init, pthread_barrier_init)
65