1/* Copyright (C) 2002-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include "pthreadP.h"
20#include <futex-internal.h>
21#include <kernel-features.h>
22#include <shlib-compat.h>
23
24static const struct pthread_barrierattr default_barrierattr =
25 {
26 .pshared = PTHREAD_PROCESS_PRIVATE
27 };
28
29
30int
31___pthread_barrier_init (pthread_barrier_t *barrier,
32 const pthread_barrierattr_t *attr, unsigned int count)
33{
34 ASSERT_TYPE_SIZE (pthread_barrier_t, __SIZEOF_PTHREAD_BARRIER_T);
35 ASSERT_PTHREAD_INTERNAL_SIZE (pthread_barrier_t,
36 struct pthread_barrier);
37
38 struct pthread_barrier *ibarrier;
39
40 /* XXX EINVAL is not specified by POSIX as a possible error code for COUNT
41 being too large. See pthread_barrier_wait for the reason for the
42 comparison with BARRIER_IN_THRESHOLD. */
43 if (__glibc_unlikely (count == 0 || count >= BARRIER_IN_THRESHOLD))
44 return EINVAL;
45
46 const struct pthread_barrierattr *iattr
47 = (attr != NULL
48 ? (struct pthread_barrierattr *) attr
49 : &default_barrierattr);
50
51 ibarrier = (struct pthread_barrier *) barrier;
52
53 /* Initialize the individual fields. */
54 ibarrier->in = 0;
55 ibarrier->out = 0;
56 ibarrier->count = count;
57 ibarrier->current_round = 0;
58 ibarrier->shared = (iattr->pshared == PTHREAD_PROCESS_PRIVATE
59 ? FUTEX_PRIVATE : FUTEX_SHARED);
60
61 return 0;
62}
63versioned_symbol (libc, ___pthread_barrier_init, pthread_barrier_init,
64 GLIBC_2_34);
65libc_hidden_ver (___pthread_barrier_init, __pthread_barrier_init)
66#ifndef SHARED
67strong_alias (___pthread_barrier_init, __pthread_barrier_init)
68#endif
69
70#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34)
71compat_symbol (libpthread, ___pthread_barrier_init, pthread_barrier_init,
72 GLIBC_2_2);
73#endif
74