1 /*
2 * Copyright (c) 2001 Daniel Eischen <deischen@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Neither the name of the author nor the names of any co-contributors
11 * may be used to endorse or promote products derived from this software
12 * without specific prior written permission.
13 *
14 * THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS''
15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28 #include <sys/cdefs.h>
29 #include <sys/types.h>
30 #include "libc_private.h"
31
32 void _thread_init_stub(void);
33 void _nmalloc_thr_init(void);
34 void _upmap_thr_init(void);
35
36 int _thread_autoinit_dummy_decl_stub = 0;
37
38 /*
39 * This stub is overridden when libpthreads is linked in. However,
40 * we can apply the constructor to the weak reference. Instead the
41 * constructor is applied to the stub and we do a run-time check to
42 * see if the stub has been overridden by pthreads.
43 */
44 void _thread_init_stub(void) __attribute__ ((constructor));
45 __weak_reference(_thread_init_stub, _thread_init);
46
47 void
_thread_init_stub(void)48 _thread_init_stub(void)
49 {
50 /*
51 * Only run libc related pthreads initialization from here
52 * if pthreads did not override the weak reference. Otherwise
53 * pthreads will do it after setting up a real thread context.
54 */
55 if (_thread_init == _thread_init_stub) {
56 _libc_thr_init();
57 }
58 }
59
60 /*
61 * Pre-initialization prior to thread startup to avoid certain
62 * chicken-and-egg issues with low-level allocations.
63 */
64 void
_libc_thr_init(void)65 _libc_thr_init(void)
66 {
67 _nmalloc_thr_init();
68 _upmap_thr_init();
69 }
70
71 __weak_reference(_thread_autoinit_dummy_decl_stub, _thread_autoinit_dummy_decl);
72