xref: /freebsd-10.3-release/lib/libthr/thread/thr_autoinit.c

/*
 * Copyright (c) 2002 Alfred Perlstein <alfred@freebsd.org>.
 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by John Birrell.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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.
 *
 * $FreeBSD: releng/10.3/lib/libthr/thread/thr_autoinit.c 115260 2003-05-23 09:48:20Z mtm $
 */

#include <pthread.h>

#include "thr_private.h"

/*
 * This module uses GCC extentions to initialize the
 * threads package at program start-up time.
 */

void	_thread_init_hack(void) __attribute__ ((constructor));

void
_thread_init_hack(void)
{

	_thread_init();
}

/*
 * For the shared version of the threads library, the above is sufficient.
 * But for the archive version of the library, we need a little bit more.
 * Namely, we must arrange for this particular module to be pulled in from
 * the archive library at link time.  To accomplish that, we define and
 * initialize a variable, "_thread_autoinit_dummy_decl".  This variable is
 * referenced (as an extern) from libc/stdlib/exit.c. This will always
 * create a need for this module, ensuring that it is present in the
 * executable.
 */
extern int _thread_autoinit_dummy_decl;
int _thread_autoinit_dummy_decl = 0;