1*8271d9b9SKonstantin Belousov /*-
2*8271d9b9SKonstantin Belousov * SPDX-License-Identifier: BSD-2-Clause
3*8271d9b9SKonstantin Belousov *
4*8271d9b9SKonstantin Belousov * Copyright (c) 2009 Hudson River Trading LLC
5*8271d9b9SKonstantin Belousov * Written by: John H. Baldwin <jhb@FreeBSD.org>
6*8271d9b9SKonstantin Belousov * All rights reserved.
7*8271d9b9SKonstantin Belousov *
8*8271d9b9SKonstantin Belousov * Redistribution and use in source and binary forms, with or without
9*8271d9b9SKonstantin Belousov * modification, are permitted provided that the following conditions
10*8271d9b9SKonstantin Belousov * are met:
11*8271d9b9SKonstantin Belousov * 1. Redistributions of source code must retain the above copyright
12*8271d9b9SKonstantin Belousov * notice, this list of conditions and the following disclaimer.
13*8271d9b9SKonstantin Belousov * 2. Redistributions in binary form must reproduce the above copyright
14*8271d9b9SKonstantin Belousov * notice, this list of conditions and the following disclaimer in the
15*8271d9b9SKonstantin Belousov * documentation and/or other materials provided with the distribution.
16*8271d9b9SKonstantin Belousov *
17*8271d9b9SKonstantin Belousov * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18*8271d9b9SKonstantin Belousov * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19*8271d9b9SKonstantin Belousov * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20*8271d9b9SKonstantin Belousov * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21*8271d9b9SKonstantin Belousov * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22*8271d9b9SKonstantin Belousov * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23*8271d9b9SKonstantin Belousov * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24*8271d9b9SKonstantin Belousov * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25*8271d9b9SKonstantin Belousov * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26*8271d9b9SKonstantin Belousov * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27*8271d9b9SKonstantin Belousov * SUCH DAMAGE.
28*8271d9b9SKonstantin Belousov */
29*8271d9b9SKonstantin Belousov
30*8271d9b9SKonstantin Belousov #include "namespace.h"
31*8271d9b9SKonstantin Belousov #include <pthread.h>
32*8271d9b9SKonstantin Belousov #include "un-namespace.h"
33*8271d9b9SKonstantin Belousov #include "libc_private.h"
34*8271d9b9SKonstantin Belousov
35*8271d9b9SKonstantin Belousov /* This implements pthread_once() for the single-threaded case. */
36*8271d9b9SKonstantin Belousov static int
_libc_once(pthread_once_t * once_control,void (* init_routine)(void))37*8271d9b9SKonstantin Belousov _libc_once(pthread_once_t *once_control, void (*init_routine)(void))
38*8271d9b9SKonstantin Belousov {
39*8271d9b9SKonstantin Belousov
40*8271d9b9SKonstantin Belousov if (once_control->state == PTHREAD_DONE_INIT)
41*8271d9b9SKonstantin Belousov return (0);
42*8271d9b9SKonstantin Belousov init_routine();
43*8271d9b9SKonstantin Belousov once_control->state = PTHREAD_DONE_INIT;
44*8271d9b9SKonstantin Belousov return (0);
45*8271d9b9SKonstantin Belousov }
46*8271d9b9SKonstantin Belousov
47*8271d9b9SKonstantin Belousov /*
48*8271d9b9SKonstantin Belousov * This is the internal interface provided to libc. It will use
49*8271d9b9SKonstantin Belousov * pthread_once() from the threading library in a multi-threaded
50*8271d9b9SKonstantin Belousov * process and _libc_once() for a single-threaded library. Because
51*8271d9b9SKonstantin Belousov * _libc_once() uses the same ABI for the values in the pthread_once_t
52*8271d9b9SKonstantin Belousov * structure as the threading library, it is safe for a process to
53*8271d9b9SKonstantin Belousov * switch from _libc_once() to pthread_once() when threading is
54*8271d9b9SKonstantin Belousov * enabled.
55*8271d9b9SKonstantin Belousov */
56*8271d9b9SKonstantin Belousov int
_once(pthread_once_t * once_control,void (* init_routine)(void))57*8271d9b9SKonstantin Belousov _once(pthread_once_t *once_control, void (*init_routine)(void))
58*8271d9b9SKonstantin Belousov {
59*8271d9b9SKonstantin Belousov
60*8271d9b9SKonstantin Belousov if (__isthreaded)
61*8271d9b9SKonstantin Belousov return (_pthread_once(once_control, init_routine));
62*8271d9b9SKonstantin Belousov return (_libc_once(once_control, init_routine));
63*8271d9b9SKonstantin Belousov }
64