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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
|
/*
* Ouroboros - Copyright (C) 2016 - 2022
*
* Ring buffer for incoming packets
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
void shm_rbuff_destroy(struct shm_rbuff * rb)
{
char fn[FN_MAX_CHARS];
assert(rb);
#ifdef CONFIG_OUROBOROS_DEBUG
pthread_mutex_lock(rb->lock);
*rb->acl = *rb->acl & ACL_FLOWDOWN;
pthread_cond_broadcast(rb->del);
pthread_cond_broadcast(rb->add);
pthread_mutex_unlock(rb->lock);
#endif
sprintf(fn, SHM_RBUFF_PREFIX "%d.%d", rb->pid, rb->flow_id);
shm_rbuff_close(rb);
shm_unlink(fn);
}
int shm_rbuff_write(struct shm_rbuff * rb,
size_t idx)
{
int ret = 0;
assert(rb);
assert(idx < SHM_BUFFER_SIZE);
#ifndef HAVE_ROBUST_MUTEX
pthread_mutex_lock(rb->lock);
#else
if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
pthread_mutex_consistent(rb->lock);
#endif
if (*rb->acl != ACL_RDWR) {
if (*rb->acl & ACL_FLOWDOWN)
ret = -EFLOWDOWN;
else if (*rb->acl & ACL_RDONLY)
ret = -ENOTALLOC;
goto err;
}
if (!shm_rbuff_free(rb)) {
ret = -EAGAIN;
goto err;
}
if (shm_rbuff_empty(rb))
pthread_cond_broadcast(rb->add);
*head_el_ptr(rb) = (ssize_t) idx;
*rb->head = (*rb->head + 1) & ((SHM_RBUFF_SIZE) - 1);
pthread_mutex_unlock(rb->lock);
return 0;
err:
pthread_mutex_unlock(rb->lock);
return ret;
}
int shm_rbuff_write_b(struct shm_rbuff * rb,
size_t idx,
const struct timespec * abstime)
{
int ret = 0;
assert(rb);
assert(idx < SHM_BUFFER_SIZE);
#ifndef HAVE_ROBUST_MUTEX
pthread_mutex_lock(rb->lock);
#else
if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
pthread_mutex_consistent(rb->lock);
#endif
if (*rb->acl != ACL_RDWR) {
if (*rb->acl & ACL_FLOWDOWN)
ret = -EFLOWDOWN;
else if (*rb->acl & ACL_RDONLY)
ret = -ENOTALLOC;
goto err;
}
pthread_cleanup_push(__cleanup_mutex_unlock, rb->lock);
while (!shm_rbuff_free(rb)
&& ret != -ETIMEDOUT
&& !(*rb->acl & ACL_FLOWDOWN)) {
if (abstime != NULL)
ret = -pthread_cond_timedwait(rb->del,
rb->lock,
abstime);
else
ret = -pthread_cond_wait(rb->del, rb->lock);
#ifdef HAVE_ROBUST_MUTEX
if (ret == -EOWNERDEAD)
pthread_mutex_consistent(rb->lock);
#endif
}
if (ret != -ETIMEDOUT) {
if (shm_rbuff_empty(rb))
pthread_cond_broadcast(rb->add);
*head_el_ptr(rb) = (ssize_t) idx;
*rb->head = (*rb->head + 1) & ((SHM_RBUFF_SIZE) - 1);
}
pthread_cleanup_pop(true);
return ret;
err:
pthread_mutex_unlock(rb->lock);
return ret;
}
static int check_rb_acl(struct shm_rbuff * rb)
{
if (*rb->acl & ACL_FLOWDOWN)
return -EFLOWDOWN;
if (*rb->acl & ACL_FLOWPEER)
return -EFLOWPEER;
return -EAGAIN;
}
ssize_t shm_rbuff_read(struct shm_rbuff * rb)
{
ssize_t ret = 0;
assert(rb);
#ifndef HAVE_ROBUST_MUTEX
pthread_mutex_lock(rb->lock);
#else
if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
pthread_mutex_consistent(rb->lock);
#endif
if (shm_rbuff_empty(rb)) {
ret = check_rb_acl(rb);
pthread_mutex_unlock(rb->lock);
return ret;
}
ret = *tail_el_ptr(rb);
*rb->tail = (*rb->tail + 1) & ((SHM_RBUFF_SIZE) - 1);
pthread_cond_broadcast(rb->del);
pthread_mutex_unlock(rb->lock);
return ret;
}
ssize_t shm_rbuff_read_b(struct shm_rbuff * rb,
const struct timespec * abstime)
{
ssize_t idx = -1;
assert(rb);
#ifndef HAVE_ROBUST_MUTEX
pthread_mutex_lock(rb->lock);
#else
if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
pthread_mutex_consistent(rb->lock);
#endif
if (shm_rbuff_empty(rb) && (*rb->acl & ACL_FLOWDOWN)) {
pthread_mutex_unlock(rb->lock);
return -EFLOWDOWN;
}
pthread_cleanup_push(__cleanup_mutex_unlock, rb->lock);
while (shm_rbuff_empty(rb) &&
idx != -ETIMEDOUT &&
check_rb_acl(rb) == -EAGAIN) {
if (abstime != NULL)
idx = -pthread_cond_timedwait(rb->add,
rb->lock,
abstime);
else
idx = -pthread_cond_wait(rb->add, rb->lock);
#ifdef HAVE_ROBUST_MUTEX
if (idx == -EOWNERDEAD)
pthread_mutex_consistent(rb->lock);
#endif
}
if (!shm_rbuff_empty(rb)) {
idx = *tail_el_ptr(rb);
*rb->tail = (*rb->tail + 1) & ((SHM_RBUFF_SIZE) - 1);
pthread_cond_broadcast(rb->del);
} else if (idx != -ETIMEDOUT) {
idx = check_rb_acl(rb);
}
pthread_cleanup_pop(true);
assert(idx != -EAGAIN);
return idx;
}
void shm_rbuff_set_acl(struct shm_rbuff * rb,
uint32_t flags)
{
assert(rb);
#ifndef HAVE_ROBUST_MUTEX
pthread_mutex_lock(rb->lock);
#else
if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
pthread_mutex_consistent(rb->lock);
#endif
*rb->acl = (size_t) flags;
pthread_cond_broadcast(rb->del);
pthread_cond_broadcast(rb->add);
pthread_mutex_unlock(rb->lock);
}
uint32_t shm_rbuff_get_acl(struct shm_rbuff * rb)
{
uint32_t flags;
assert(rb);
#ifndef HAVE_ROBUST_MUTEX
pthread_mutex_lock(rb->lock);
#else
if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
pthread_mutex_consistent(rb->lock);
#endif
flags = (uint32_t) *rb->acl;
pthread_mutex_unlock(rb->lock);
return flags;
}
void shm_rbuff_fini(struct shm_rbuff * rb)
{
assert(rb);
#ifndef HAVE_ROBUST_MUTEX
pthread_mutex_lock(rb->lock);
#else
if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
pthread_mutex_consistent(rb->lock);
#endif
pthread_cleanup_push(__cleanup_mutex_unlock, rb->lock);
while (!shm_rbuff_empty(rb))
#ifndef HAVE_ROBUST_MUTEX
pthread_cond_wait(rb->del, rb->lock);
#else
if (pthread_cond_wait(rb->del, rb->lock) == EOWNERDEAD)
pthread_mutex_consistent(rb->lock);
#endif
pthread_cleanup_pop(true);
}
size_t shm_rbuff_queued(struct shm_rbuff * rb)
{
size_t ret;
assert(rb);
#ifndef HAVE_ROBUST_MUTEX
pthread_mutex_lock(rb->lock);
#else
if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
pthread_mutex_consistent(rb->lock);
#endif
ret = shm_rbuff_used(rb);
pthread_mutex_unlock(rb->lock);
return ret;
}
|