1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/* class-init.c - Initialize a capability class.
Copyright (C) 2004, 2005 Free Software Foundation, Inc.
Written by Marcus Brinkmann <marcus@gnu.org>
This file is part of the GNU Hurd.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <assert.h>
#include <stdlib.h>
#include <pthread.h>
#include <hurd/slab.h>
#include <hurd/cap-server.h>
/* Initialize the slab object pointed to by BUFFER. HOOK is as
provided to hurd_slab_create. */
static error_t
_hurd_cap_obj_constructor (void *hook, void *buffer)
{
hurd_cap_class_t cap_class = (hurd_cap_class_t) hook;
hurd_cap_obj_t obj = (hurd_cap_obj_t) buffer;
error_t err;
/* First do our own initialization. */
obj->cap_class = cap_class;
err = pthread_mutex_init (&obj->lock, 0);
if (err)
return err;
obj->refs = 1;
obj->state = _HURD_CAP_STATE_GREEN;
obj->pending_rpcs = NULL;
/* The member COND_WAITER does not need to be initialized. */
obj->clients = NULL;
/* Then do the user part, if necessary. */
if (cap_class->obj_init)
{
err = (*cap_class->obj_init) (cap_class, obj);
if (err)
{
pthread_mutex_destroy (&obj->lock);
return err;
}
}
return 0;
}
/* Destroy the slab object pointed to by BUFFER. HOOK is as provided
to hurd_slab_create. */
static void
_hurd_cap_obj_destructor (void *hook, void *buffer)
{
hurd_cap_class_t cap_class = (hurd_cap_class_t) hook;
hurd_cap_obj_t obj = (hurd_cap_obj_t) buffer;
if (cap_class->obj_destroy)
(*cap_class->obj_destroy) (cap_class, obj);
pthread_mutex_destroy (&obj->lock);
}
/* Same as hurd_cap_class_create, but doesn't allocate the storage for
CAP_CLASS. Instead, you have to provide it. */
error_t
hurd_cap_class_init_untyped (hurd_cap_class_t cap_class,
size_t size, size_t alignment,
hurd_cap_obj_init_t obj_init,
hurd_cap_obj_alloc_t obj_alloc,
hurd_cap_obj_reinit_t obj_reinit,
hurd_cap_obj_destroy_t obj_destroy,
hurd_cap_class_demuxer_t demuxer)
{
error_t err;
/* The alignment requirements must be a power of 2. */
assert ((alignment & (alignment - 1)) == 0
|| ! "hurd_cap_class_init_untyped: "
"requested alignment not a power of 2");
/* Find the smallest alignment requirement common to the user object
and a struct hurd_cap_obj. Since both are required to be a power
of 2, we need simply take the larger one. */
if (alignment < __alignof__(struct hurd_cap_obj))
alignment = __alignof__(struct hurd_cap_obj);
size += hurd_cap_obj_user_offset (alignment);
/* Capability object management. */
cap_class->obj_init = obj_init;
cap_class->obj_alloc = obj_alloc;
cap_class->obj_reinit = obj_reinit;
cap_class->obj_destroy = obj_destroy;
err = hurd_slab_init (&cap_class->obj_space, size, alignment, NULL, NULL,
_hurd_cap_obj_constructor, _hurd_cap_obj_destructor,
cap_class);
if (err)
goto err_obj_space;
err = pthread_cond_init (&cap_class->obj_cond, NULL);
if (err)
goto err_obj_cond;
err = pthread_mutex_init (&cap_class->obj_cond_lock, NULL);
if (err)
goto err_obj_cond_lock;
/* Class management. */
cap_class->demuxer = demuxer;
err = pthread_mutex_init (&cap_class->lock, NULL);
if (err)
goto err_lock;
cap_class->state = _HURD_CAP_STATE_GREEN;
err = pthread_cond_init (&cap_class->cond, NULL);
if (err)
goto err_cond;
/* The cond_waiter member doesn't need to be initialized. It is
only valid when CAP_CLASS->STATE is _HURD_CAP_STATE_YELLOW. */
cap_class->pending_rpcs = NULL;
/* FIXME: Add the class to the list of classes to be served by
RPCs. */
return 0;
/* This is provided here in case you add more initialization to the
end of the above code. */
#if 0
pthread_cond_destroy (&cap_class->cond);
#endif
err_cond:
pthread_mutex_destroy (&cap_class->lock);
err_lock:
pthread_mutex_destroy (&cap_class->obj_cond_lock);
err_obj_cond_lock:
pthread_cond_destroy (&cap_class->obj_cond);
err_obj_cond:
/* This can not fail at this point. */
hurd_slab_destroy (&cap_class->obj_space);
err_obj_space:
return err;
}
|
