rtld_lock.h revision 281453 
1/*-
2 * Copyright 2003 Alexander Kabaev.
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. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * $FreeBSD: stable/10/libexec/rtld-elf/rtld_lock.h 281453 2015-04-12 06:45:40Z kib $
26 */
27
28#ifndef _RTLD_LOCK_H_
29#define	_RTLD_LOCK_H_
30
31#define	RTLI_VERSION	0x01
32#define	MAX_RTLD_LOCKS	8
33
34struct RtldLockInfo
35{
36	unsigned int rtli_version;
37	void *(*lock_create)(void);
38	void  (*lock_destroy)(void *);
39	void  (*rlock_acquire)(void *);
40	void  (*wlock_acquire)(void *);
41	void  (*lock_release)(void *);
42	int   (*thread_set_flag)(int);
43	int   (*thread_clr_flag)(int);
44	void  (*at_fork)(void);
45};
46
47extern void _rtld_thread_init(struct RtldLockInfo *) __exported;
48extern void _rtld_atfork_pre(int *) __exported;
49extern void _rtld_atfork_post(int *) __exported;
50
51#ifdef IN_RTLD
52
53struct rtld_lock;
54typedef struct rtld_lock *rtld_lock_t;
55
56extern rtld_lock_t	rtld_bind_lock;
57extern rtld_lock_t	rtld_libc_lock;
58extern rtld_lock_t	rtld_phdr_lock;
59
60#define	RTLD_LOCK_UNLOCKED	0
61#define	RTLD_LOCK_RLOCKED	1
62#define	RTLD_LOCK_WLOCKED	2
63
64struct Struct_RtldLockState;
65typedef struct Struct_RtldLockState RtldLockState;
66
67void	rlock_acquire(rtld_lock_t, RtldLockState *);
68void 	wlock_acquire(rtld_lock_t, RtldLockState *);
69void	lock_release(rtld_lock_t, RtldLockState *);
70void	lock_upgrade(rtld_lock_t, RtldLockState *);
71void	lock_restart_for_upgrade(RtldLockState *);
72
73#endif	/* IN_RTLD */
74
75#endif
76