1  /* Initialize a rwlock.  Generic version.
       2     Copyright (C) 2002-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       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 <pthread.h>
      20  #include <string.h>
      21  #include <pt-internal.h>
      22  
      23  int
      24  _pthread_rwlock_init (pthread_rwlock_t *rwlock,
      25  		      const pthread_rwlockattr_t *attr)
      26  {
      27    ASSERT_TYPE_SIZE (pthread_rwlock_t, __SIZEOF_PTHREAD_RWLOCK_T);
      28  
      29    *rwlock = (pthread_rwlock_t) __PTHREAD_RWLOCK_INITIALIZER;
      30  
      31    if (attr == NULL
      32        || memcmp (attr, &__pthread_default_rwlockattr, sizeof (*attr)) == 0)
      33      /* Use the default attributes.  */
      34      return 0;
      35  
      36    /* Non-default attributes.  */
      37  
      38    rwlock->__attr = malloc (sizeof *attr);
      39    if (rwlock->__attr == NULL)
      40      return ENOMEM;
      41  
      42    *rwlock->__attr = *attr;
      43    return 0;
      44  }
      45  
      46  strong_alias (_pthread_rwlock_init, pthread_rwlock_init);