2 * Copyright (c) 2009 Advanced Computing Technologies LLC
3 * Written by: John H. Baldwin <jhb@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * $FreeBSD: head/lib/libc/gen/_once_stub.c 199614 2009-11-20 20:43:34Z jhb $
31 #include "namespace.h"
33 #include "un-namespace.h"
34 #include "libc_private.h"
36 /* This implements pthread_once() for the single-threaded case. */
38 _libc_once(pthread_once_t
*once_control
, void (*init_routine
)(void))
41 if (once_control
->__state
== PTHREAD_DONE_INIT
)
44 once_control
->__state
= PTHREAD_DONE_INIT
;
49 * This is the internal interface provided to libc. It will use
50 * pthread_once() from the threading library in a multi-threaded
51 * process and _libc_once() for a single-threaded library. Because
52 * _libc_once() uses the same ABI for the values in the pthread_once_t
53 * structure as the threading library, it is safe for a process to
54 * switch from _libc_once() to pthread_once() when threading is
58 _once(pthread_once_t
*once_control
, void (*init_routine
)(void))
62 return (_pthread_once(once_control
, init_routine
));
63 return (_libc_once(once_control
, init_routine
));