libc/libpthread: Inject threadsafe locking callbacks for rtld.
[dragonfly.git] / lib / libthread_xu / thread / thr_rtld.c
1 /*
2  * Copyright (c) 2006, David Xu <davidxu@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 unmodified, this list of conditions, and the following
10  *    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.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  *
26  * $FreeBSD: src/lib/libpthread/thread/thr_rtld.c,v 1.5 2003/11/05 18:19:24 deischen Exp $
27  */
28
29 #include "namespace.h"
30 #include <machine/tls.h>
31 #include <stdlib.h>
32 #include <pthread.h>
33
34 #include "un-namespace.h"
35 #include "rtld_lock.h"
36 #include "thr_private.h"
37
38 static int      _thr_rtld_clr_flag(int);
39 static void     *_thr_rtld_lock_create(void);
40 static void     _thr_rtld_lock_destroy(void *);
41 static void     _thr_rtld_lock_release(void *);
42 static void     _thr_rtld_rlock_acquire(void *);
43 static int      _thr_rtld_set_flag(int);
44 static void     _thr_rtld_wlock_acquire(void *);
45
46 static void *
47 _thr_rtld_lock_create(void)
48 {
49         pthread_rwlock_t prwlock;
50         if (_pthread_rwlock_init(&prwlock, NULL))
51                 return (NULL);
52         return (prwlock);
53 }
54
55 static void
56 _thr_rtld_lock_destroy(void *lock)
57 {
58         pthread_rwlock_t prwlock;
59
60         prwlock = (pthread_rwlock_t)lock;
61         if (prwlock != NULL)
62                 _pthread_rwlock_destroy(&prwlock);
63 }
64
65 static void
66 _thr_rtld_rlock_acquire(void *lock)
67 {
68         pthread_rwlock_t prwlock;
69
70         prwlock = (pthread_rwlock_t)lock;
71         _pthread_rwlock_rdlock(&prwlock);
72 }
73
74 static void
75 _thr_rtld_wlock_acquire(void *lock)
76 {
77         pthread_rwlock_t prwlock;
78
79         prwlock = (pthread_rwlock_t)lock;
80         _pthread_rwlock_wrlock(&prwlock);
81 }
82
83 static void
84 _thr_rtld_lock_release(void *lock)
85 {
86         pthread_rwlock_t prwlock;
87
88         prwlock = (pthread_rwlock_t)lock;
89         _pthread_rwlock_unlock(&prwlock);
90 }
91
92
93 static int
94 _thr_rtld_set_flag(int mask)
95 {
96         struct pthread *curthread;
97         int bits;
98
99         curthread = tls_get_curthread();
100         if (curthread != NULL) {
101                 bits = curthread->rtld_bits;
102                 curthread->rtld_bits |= mask;
103         } else {
104                 bits = 0;
105                 PANIC("No current thread in rtld call");
106         }
107
108         return (bits);
109 }
110
111 static int
112 _thr_rtld_clr_flag(int mask)
113 {
114         struct pthread *curthread;
115         int bits;
116
117         curthread = tls_get_curthread();
118         if (curthread != NULL) {
119                 bits = curthread->rtld_bits;
120                 curthread->rtld_bits &= ~mask;
121         } else {
122                 bits = 0;
123                 PANIC("No current thread in rtld call");
124         }
125         return (bits);
126 }
127
128 void
129 _thr_rtld_init(void)
130 {
131         struct RtldLockInfo li;
132
133         li.lock_create  = _thr_rtld_lock_create;
134         li.lock_destroy = _thr_rtld_lock_destroy;
135         li.rlock_acquire = _thr_rtld_rlock_acquire;
136         li.wlock_acquire = _thr_rtld_wlock_acquire;
137         li.lock_release  = _thr_rtld_lock_release;
138         li.thread_set_flag = _thr_rtld_set_flag;
139         li.thread_clr_flag = _thr_rtld_clr_flag;
140         li.at_fork = NULL;
141         _rtld_thread_init(&li);
142 }
143
144 void
145 _thr_rtld_fini(void)
146 {
147         _rtld_thread_init(NULL);
148 }