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/* Copyright (C) 2002-2013 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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include "pthreadP.h"
#include <lowlevellock.h>
#include <kernel-features.h>
static const struct pthread_barrierattr default_attr =
{
.pshared = PTHREAD_PROCESS_PRIVATE
};
int
pthread_barrier_init (barrier, attr, count)
pthread_barrier_t *barrier;
const pthread_barrierattr_t *attr;
unsigned int count;
{
struct pthread_barrier *ibarrier;
if (__builtin_expect (count == 0, 0))
return EINVAL;
const struct pthread_barrierattr *iattr
= (attr != NULL
? iattr = (struct pthread_barrierattr *) attr
: &default_attr);
if (iattr->pshared != PTHREAD_PROCESS_PRIVATE
&& __builtin_expect (iattr->pshared != PTHREAD_PROCESS_SHARED, 0))
/* Invalid attribute. */
return EINVAL;
ibarrier = (struct pthread_barrier *) barrier;
/* Initialize the individual fields. */
ibarrier->lock = LLL_LOCK_INITIALIZER;
ibarrier->left = count;
ibarrier->init_count = count;
ibarrier->curr_event = 0;
#ifdef __ASSUME_PRIVATE_FUTEX
ibarrier->private = (iattr->pshared != PTHREAD_PROCESS_PRIVATE
? 0 : FUTEX_PRIVATE_FLAG);
#else
ibarrier->private = (iattr->pshared != PTHREAD_PROCESS_PRIVATE
? 0 : THREAD_GETMEM (THREAD_SELF,
header.private_futex));
#endif
return 0;
}
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