mirror of
https://github.com/freebsd/freebsd-src
synced 2024-10-15 12:54:27 +00:00
8271d9b99a
that existed in auxv.c, use simple bool gate instead. This leaves a small window if two threads try to call _elf_aux_info(3) simultaneously. The situation is safe because auxv parsing is really idempotent. The parsed data is the same, and we store atomic types (int/long/ptr) so double-init does not matter. Reviewed by: brooks, imp Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D43985
64 lines
2.4 KiB
C
64 lines
2.4 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2009 Hudson River Trading LLC
|
|
* Written by: John H. Baldwin <jhb@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "namespace.h"
|
|
#include <pthread.h>
|
|
#include "un-namespace.h"
|
|
#include "libc_private.h"
|
|
|
|
/* This implements pthread_once() for the single-threaded case. */
|
|
static int
|
|
_libc_once(pthread_once_t *once_control, void (*init_routine)(void))
|
|
{
|
|
|
|
if (once_control->state == PTHREAD_DONE_INIT)
|
|
return (0);
|
|
init_routine();
|
|
once_control->state = PTHREAD_DONE_INIT;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This is the internal interface provided to libc. It will use
|
|
* pthread_once() from the threading library in a multi-threaded
|
|
* process and _libc_once() for a single-threaded library. Because
|
|
* _libc_once() uses the same ABI for the values in the pthread_once_t
|
|
* structure as the threading library, it is safe for a process to
|
|
* switch from _libc_once() to pthread_once() when threading is
|
|
* enabled.
|
|
*/
|
|
int
|
|
_once(pthread_once_t *once_control, void (*init_routine)(void))
|
|
{
|
|
|
|
if (__isthreaded)
|
|
return (_pthread_once(once_control, init_routine));
|
|
return (_libc_once(once_control, init_routine));
|
|
}
|