| 1 | /* Copyright (C) 2002-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <errno.h> |
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| 19 | #include "pthreadP.h" |
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| 20 | #include <futex-internal.h> |
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| 21 | #include <kernel-features.h> |
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| 22 | #include <shlib-compat.h> |
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| 23 | |
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| 24 | static const struct pthread_barrierattr default_barrierattr = |
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| 25 | { |
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| 26 | .pshared = PTHREAD_PROCESS_PRIVATE |
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| 27 | }; |
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| 28 | |
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| 29 | |
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| 30 | int |
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| 31 | ___pthread_barrier_init (pthread_barrier_t *barrier, |
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| 32 | const pthread_barrierattr_t *attr, unsigned int count) |
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| 33 | { |
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| 34 | ASSERT_TYPE_SIZE (pthread_barrier_t, __SIZEOF_PTHREAD_BARRIER_T); |
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| 35 | ASSERT_PTHREAD_INTERNAL_SIZE (pthread_barrier_t, |
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| 36 | struct pthread_barrier); |
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| 37 | |
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| 38 | struct pthread_barrier *ibarrier; |
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| 39 | |
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| 40 | /* XXX EINVAL is not specified by POSIX as a possible error code for COUNT |
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| 41 | being too large. See pthread_barrier_wait for the reason for the |
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| 42 | comparison with BARRIER_IN_THRESHOLD. */ |
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| 43 | if (__glibc_unlikely (count == 0 || count >= BARRIER_IN_THRESHOLD)) |
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| 44 | return EINVAL; |
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| 45 | |
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| 46 | const struct pthread_barrierattr *iattr |
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| 47 | = (attr != NULL |
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| 48 | ? (struct pthread_barrierattr *) attr |
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| 49 | : &default_barrierattr); |
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| 50 | |
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| 51 | ibarrier = (struct pthread_barrier *) barrier; |
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| 52 | |
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| 53 | /* Initialize the individual fields. */ |
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| 54 | ibarrier->in = 0; |
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| 55 | ibarrier->out = 0; |
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| 56 | ibarrier->count = count; |
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| 57 | ibarrier->current_round = 0; |
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| 58 | ibarrier->shared = (iattr->pshared == PTHREAD_PROCESS_PRIVATE |
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| 59 | ? FUTEX_PRIVATE : FUTEX_SHARED); |
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| 60 | |
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| 61 | return 0; |
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| 62 | } |
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| 63 | versioned_symbol (libc, ___pthread_barrier_init, pthread_barrier_init, |
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| 64 | GLIBC_2_34); |
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| 65 | libc_hidden_ver (___pthread_barrier_init, __pthread_barrier_init) |
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| 66 | #ifndef SHARED |
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| 67 | strong_alias (___pthread_barrier_init, __pthread_barrier_init) |
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| 68 | #endif |
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| 69 | |
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| 70 | #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34) |
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| 71 | compat_symbol (libpthread, ___pthread_barrier_init, pthread_barrier_init, |
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| 72 | GLIBC_2_2); |
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| 73 | #endif |
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| 74 | |
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