mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 07:10:06 +00:00
d8ff3792a8
Add private field. * sysdeps/unix/sysv/linux/lowlevelbarrier.sym: Add PRIVATE definition. * pthread_barrier_init.c: Set private flag if pshared and private futexes are supported. * sysdeps/unix/sysv/linux/i386/i486/pthread_barrier_wait.S: Use private field in futex command setup. * sysdeps/unix/sysv/linux/x86_64/pthread_barrier_wait.S: Likewise.
72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/* Copyright (C) 2002, 2007 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#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;
|
|
|
|
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;
|
|
}
|