/* Copyright (C) 2002-2015 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_barrierattr = { .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 (__glibc_unlikely (count == 0)) return EINVAL; const struct pthread_barrierattr *iattr = (attr != NULL ? iattr = (struct pthread_barrierattr *) attr : &default_barrierattr); 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; }