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  
      24  static const struct pthread_barrierattr default_barrierattr =
      25    {
      26      .pshared = PTHREAD_PROCESS_PRIVATE
      27    };
      28  
      29  
      30  int
      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  }
      63  versioned_symbol (libc, ___pthread_barrier_init, pthread_barrier_init,
      64                    GLIBC_2_34);
      65  libc_hidden_ver (___pthread_barrier_init, __pthread_barrier_init)
      66  #ifndef SHARED
      67  strong_alias (___pthread_barrier_init, __pthread_barrier_init)
      68  #endif
      69  
      70  #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34)
      71  compat_symbol (libpthread, ___pthread_barrier_init, pthread_barrier_init,
      72                 GLIBC_2_2);
      73  #endif