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- /* 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, see
- <http://www.gnu.org/licenses/>. */
- #include <errno.h>
- #include "pthreadP.h"
- #include <lowlevellock.h>
- #include <bits/kernel-features.h>
- static const struct pthread_barrierattr default_attr =
- {
- .pshared = PTHREAD_PROCESS_PRIVATE
- };
- int
- pthread_barrier_init (
- 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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