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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/* $OpenBSD: srp.h,v 1.6 2015/11/26 12:17:19 mpi Exp $ */
/*
* Copyright (c) 2014 Jonathan Matthew <jmatthew@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _SYS_SRP_H_
#define _SYS_SRP_H_
#include <sys/refcnt.h>
struct srp {
void *ref;
};
struct srp_hazard {
struct srp *sh_p;
void *sh_v;
};
#define SRP_HAZARD_NUM 16
struct srp_gc {
void (*srp_gc_dtor)(void *, void *);
void *srp_gc_cookie;
struct refcnt srp_gc_refcnt;
};
#ifdef _KERNEL
#define SRP_INITIALIZER() { NULL }
#define SRP_GC_INITIALIZER(_d, _c) { (_d), (_c), REFCNT_INITIALIZER() }
void srp_startup(void);
void srp_gc_init(struct srp_gc *, void (*)(void *, void *), void *);
void srp_update_locked(struct srp_gc *, struct srp *, void *);
void *srp_get_locked(struct srp *);
void srp_finalize(struct srp_gc *);
void srp_init(struct srp *);
#ifdef MULTIPROCESSOR
void srp_update(struct srp_gc *, struct srp *, void *);
void *srp_enter(struct srp *);
void *srp_follow(struct srp *, void *, struct srp *);
void srp_leave(struct srp *, void *);
#else /* MULTIPROCESSOR */
#define srp_update(_gc, _srp, _v) srp_update_locked((_gc), (_srp), (_v))
#define srp_enter(_srp) ((_srp)->ref)
#define srp_follow(_srp, _v, _next) ((_next)->ref)
#define srp_leave(_srp, _v) do { } while (0)
#endif /* MULTIPROCESSOR */
#endif /* _KERNEL */
/*
* singly linked list built by following srps
*/
struct srpl_rc {
void (*srpl_ref)(void *, void *);
struct srp_gc srpl_gc;
};
#define srpl_cookie srpl_gc.srp_gc_cookie
struct srpl {
struct srp sl_head;
};
struct srpl_entry {
struct srp se_next;
};
struct srpl_iter {
struct srp * si_ref;
};
#ifdef _KERNEL
void srpl_rc_init(struct srpl_rc *, void (*)(void *, void *),
void (*)(void *, void *), void *);
#define SRPL_RC_INITIALIZER(_r, _u, _c) { _r, SRP_GC_INITIALIZER(_u, _c) }
#define SRPL_INIT(_sl) srp_init(&(_sl)->sl_head)
static inline void *
_srpl_enter(struct srpl *sl, struct srpl_iter *si)
{
si->si_ref = &sl->sl_head;
return (srp_enter(si->si_ref));
}
static inline void *
_srpl_next(struct srpl_iter *si, void *elm, struct srp *nref)
{
void *n;
n = srp_follow(si->si_ref, elm, nref);
si->si_ref = nref;
return (n);
}
#define SRPL_ENTER(_sl, _si) _srpl_enter(_sl, _si)
#define SRPL_NEXT(_si, _e, _ENTRY) \
_srpl_next(_si, _e, &(_e)->_ENTRY.se_next)
#define SRPL_FOREACH(_c, _sl, _si, _ENTRY) \
for ((_c) = SRPL_ENTER(_sl, _si); \
(_c) != NULL; \
(_c) = SRPL_NEXT(_si, _c, _ENTRY))
#define SRPL_LEAVE(_si, _c) srp_leave((_si)->si_ref, (_c))
#define SRPL_EMPTY_LOCKED(_sl) (SRPL_FIRST_LOCKED(_sl) == NULL)
#define SRPL_FIRST_LOCKED(_sl) srp_get_locked(&(_sl)->sl_head)
#define SRPL_NEXT_LOCKED(_e, _ENTRY) \
srp_get_locked(&(_e)->_ENTRY.se_next)
#define SRPL_FOREACH_LOCKED(_c, _sl, _ENTRY) \
for ((_c) = SRPL_FIRST_LOCKED(_sl); \
(_c) != NULL; \
(_c) = SRPL_NEXT_LOCKED((_c), _ENTRY))
#define SRPL_FOREACH_SAFE_LOCKED(_c, _sl, _ENTRY, _tc) \
for ((_c) = SRPL_FIRST_LOCKED(_sl); \
(_c) && ((_tc) = SRPL_NEXT_LOCKED(_c, _ENTRY), 1); \
(_c) = (_tc))
#define SRPL_INSERT_HEAD_LOCKED(_rc, _sl, _e, _ENTRY) do { \
void *head; \
\
srp_init(&(_e)->_ENTRY.se_next); \
\
head = SRPL_FIRST_LOCKED(_sl); \
if (head != NULL) { \
(_rc)->srpl_ref(&(_rc)->srpl_cookie, head); \
srp_update_locked(&(_rc)->srpl_gc, \
&(_e)->_ENTRY.se_next, head); \
} \
\
(_rc)->srpl_ref(&(_rc)->srpl_cookie, _e); \
srp_update_locked(&(_rc)->srpl_gc, &(_sl)->sl_head, (_e)); \
} while (0)
#define SRPL_INSERT_AFTER_LOCKED(_rc, _se, _e, _ENTRY) do { \
void *next; \
\
srp_init(&(_e)->_ENTRY.se_next); \
\
next = SRPL_NEXT_LOCKED(_se, _ENTRY); \
if (next != NULL) { \
(_rc)->srpl_ref(&(_rc)->srpl_cookie, next); \
srp_update_locked(&(_rc)->srpl_gc, \
&(_e)->_ENTRY.se_next, next); \
} \
\
(_rc)->srpl_ref(&(_rc)->srpl_cookie, _e); \
srp_update_locked(&(_rc)->srpl_gc, \
&(_se)->_ENTRY.se_next, (_e)); \
} while (0)
#define SRPL_REMOVE_LOCKED(_rc, _sl, _e, _type, _ENTRY) do { \
struct srp *ref; \
struct _type *c, *n; \
\
ref = &(_sl)->sl_head; \
while ((c = srp_get_locked(ref)) != (_e)) \
ref = &c->_ENTRY.se_next; \
\
n = SRPL_NEXT_LOCKED(c, _ENTRY); \
if (n != NULL) \
(_rc)->srpl_ref(&(_rc)->srpl_cookie, n); \
srp_update_locked(&(_rc)->srpl_gc, ref, n); \
srp_update_locked(&(_rc)->srpl_gc, &c->_ENTRY.se_next, NULL); \
} while (0)
#endif /* _KERNEL */
#endif /* _SYS_SRP_H_ */
|
