sysdeps/htl/pt-rwlock-init.c

   1 /* Initialize a rwlock.  Generic version.
   2    Copyright (C) 2002-2019 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   *rwlock = (pthread_rwlock_t) __PTHREAD_RWLOCK_INITIALIZER;
  28
  29   if (attr == NULL
  30       || memcmp (attr, &__pthread_default_rwlockattr, sizeof (*attr)) == 0)
  31     /* Use the default attributes.  */
  32     return 0;
  33
  34   /* Non-default attributes.  */
  35
  36   rwlock->__attr = malloc (sizeof *attr);
  37   if (rwlock->__attr == NULL)
  38     return ENOMEM;
  39
  40   *rwlock->__attr = *attr;
  41   return 0;
  42 }
  43
  44 strong_alias (_pthread_rwlock_init, pthread_rwlock_init);