1199606Sjhb/*-
2281887Sjhb * Copyright (c) 2009 Hudson River Trading LLC
3199606Sjhb * Written by: John H. Baldwin <jhb@FreeBSD.org>
4199606Sjhb * All rights reserved.
5199606Sjhb *
6199606Sjhb * Redistribution and use in source and binary forms, with or without
7199606Sjhb * modification, are permitted provided that the following conditions
8199606Sjhb * are met:
9199606Sjhb * 1. Redistributions of source code must retain the above copyright
10199606Sjhb *    notice, this list of conditions and the following disclaimer.
11199606Sjhb * 2. Redistributions in binary form must reproduce the above copyright
12199606Sjhb *    notice, this list of conditions and the following disclaimer in the
13199606Sjhb *    documentation and/or other materials provided with the distribution.
14199606Sjhb *
15199606Sjhb * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16199606Sjhb * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17199606Sjhb * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18199606Sjhb * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19199606Sjhb * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20199606Sjhb * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21199606Sjhb * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22199606Sjhb * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23199606Sjhb * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24199606Sjhb * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25199606Sjhb * SUCH DAMAGE.
26199606Sjhb */
27199606Sjhb
28199606Sjhb#include <sys/cdefs.h>
29199606Sjhb__FBSDID("$FreeBSD$");
30199606Sjhb
31199606Sjhb#include "namespace.h"
32199606Sjhb#include <pthread.h>
33199606Sjhb#include "un-namespace.h"
34199606Sjhb#include "libc_private.h"
35199606Sjhb
36199614Sjhb/* This implements pthread_once() for the single-threaded case. */
37199614Sjhbstatic int
38199606Sjhb_libc_once(pthread_once_t *once_control, void (*init_routine)(void))
39199606Sjhb{
40199606Sjhb
41199606Sjhb	if (once_control->state == PTHREAD_DONE_INIT)
42199606Sjhb		return (0);
43199606Sjhb	init_routine();
44199606Sjhb	once_control->state = PTHREAD_DONE_INIT;
45199606Sjhb	return (0);
46199606Sjhb}
47199606Sjhb
48199606Sjhb/*
49199606Sjhb * This is the internal interface provided to libc.  It will use
50199606Sjhb * pthread_once() from the threading library in a multi-threaded
51199606Sjhb * process and _libc_once() for a single-threaded library.  Because
52199606Sjhb * _libc_once() uses the same ABI for the values in the pthread_once_t
53199606Sjhb * structure as the threading library, it is safe for a process to
54199606Sjhb * switch from _libc_once() to pthread_once() when threading is
55199606Sjhb * enabled.
56199606Sjhb */
57199606Sjhbint
58199606Sjhb_once(pthread_once_t *once_control, void (*init_routine)(void))
59199606Sjhb{
60199606Sjhb
61199606Sjhb	if (__isthreaded)
62199606Sjhb		return (_pthread_once(once_control, init_routine));
63199606Sjhb	return (_libc_once(once_control, init_routine));
64199606Sjhb}
65