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/* Copyright (C) 2002-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "pthreadP.h"
#include <string.h>
#include <pthread-offsets.h>
static const struct pthread_rwlockattr default_rwlockattr =
{
.lockkind = PTHREAD_RWLOCK_DEFAULT_NP,
.pshared = PTHREAD_PROCESS_PRIVATE
};
/* See pthread_rwlock_common.c. */
int
__pthread_rwlock_init (pthread_rwlock_t *rwlock,
const pthread_rwlockattr_t *attr)
{
ASSERT_TYPE_SIZE (pthread_rwlock_t, __SIZEOF_PTHREAD_RWLOCK_T);
/* The __flags is the only field where its offset should be checked to
avoid ABI breakage with static initializers. */
ASSERT_PTHREAD_INTERNAL_OFFSET (pthread_rwlock_t, __data.__flags,
__PTHREAD_RWLOCK_FLAGS_OFFSET);
ASSERT_PTHREAD_INTERNAL_MEMBER_SIZE (pthread_rwlock_t, __data.__flags,
int);
const struct pthread_rwlockattr *iattr;
iattr = ((const struct pthread_rwlockattr *) attr) ?: &default_rwlockattr;
memset (rwlock, '\0', sizeof (*rwlock));
rwlock->__data.__flags = iattr->lockkind;
/* The value of __SHARED in a private rwlock must be zero. */
rwlock->__data.__shared = (iattr->pshared != PTHREAD_PROCESS_PRIVATE);
return 0;
}
strong_alias (__pthread_rwlock_init, pthread_rwlock_init)
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