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
|
/*
* Copyright 2016 Garrett D'Amore <garrett@damore.org>
*
* This software is supplied under the terms of the MIT License, a
* copy of which should be located in the distribution where this
* file was obtained (LICENSE.txt). A copy of the license may also be
* found online at https://opensource.org/licenses/MIT.
*/
#include <stdlib.h>
#include <string.h>
#include "core/nng_impl.h"
/*
* Pair protocol. The PAIR protocol is a simple 1:1 messaging pattern.
*/
typedef struct pair * pair_t;
typedef struct pairpipe * pairpipe_t;
/*
* Note that pair can only have a single pipe, so we don't need
* to create separate data structures for diferent pipe instances.
*/
struct pair {
nni_socket_t sock;
nni_mutex_t mx;
nni_pipe_t pipe;
nni_msgqueue_t uwq;
nni_msgqueue_t urq;
};
struct pairpipe {
nni_pipe_t pipe;
pair_t pair;
int good;
nni_thread_t sthr;
nni_thread_t rthr;
int sigclose;
};
static void pair_receiver(void *);
static void pair_sender(void *);
static int
pair_create(void **pairp, nni_socket_t sock)
{
pair_t pair;
int rv;
if ((pair = nni_alloc(sizeof (*pair))) == NULL) {
return (NNG_ENOMEM);
}
if ((rv = nni_mutex_create(&pair->mx)) != 0) {
nni_free(pair, sizeof (*pair));
return (rv);
}
pair->sock = sock;
pair->uwq = nni_socket_sendq(sock);
pair->urq = nni_socket_recvq(sock);
*pairp = pair;
return (0);
}
static void
pair_destroy(void *arg)
{
pair_t pair = arg;
nni_mutex_destroy(pair->mx);
nni_free(pair, sizeof (*pair));
}
static void
pair_shutdown(void *arg, uint64_t usec)
{
pair_t pair = arg;
nni_pipe_t pipe;
NNI_ARG_UNUSED(usec);
/*
* XXX: correct implementation here is to set a draining flag,
* and wait a bit for the sender to finish draining (linger),
* then reap the pipe. For now we just act a little more harshly.
*/
nni_mutex_enter(pair->mx);
pipe = pair->pipe;
pair->pipe = NULL;
nni_mutex_exit(pair->mx);
nni_pipe_close(pipe);
}
static int
pair_add_pipe(void *arg, nni_pipe_t pipe)
{
pair_t pair = arg;
pairpipe_t pp;
int rv;
pp = nni_alloc(sizeof (*pp));
pp->pipe = pipe;
pp->good = 0;
pp->sigclose = 0;
pp->sthr = NULL;
pp->rthr = NULL;
nni_mutex_enter(pair->mx);
if (pair->pipe != NULL) {
/* Already have a peer, denied. */
nni_mutex_exit(pair->mx);
nni_free(pp, sizeof (*pp));
return (NNG_EBUSY);
}
if ((rv = nni_thread_create(&pp->rthr, pair_receiver, pp)) != 0) {
nni_mutex_exit(pair->mx);
return (rv);
}
if ((rv = nni_thread_create(&pp->sthr, pair_sender, pp)) != 0) {
nni_mutex_exit(pair->mx);
return (rv);
}
pp->good = 1;
pair->pipe = pipe;
nni_mutex_exit(pair->mx);
return (NNG_EINVAL);
}
static int
pair_remove_pipe(void *arg, nni_pipe_t pipe)
{
pairpipe_t pp = arg;
pair_t pair = pp->pair;
if (pp->sthr) {
(void) nni_thread_reap(pp->sthr);
}
if (pp->rthr) {
(void) nni_thread_reap(pp->rthr);
}
nni_mutex_enter(pair->mx);
if (pair->pipe != pipe) {
nni_mutex_exit(pair->mx);
return (NNG_EINVAL);
}
nni_mutex_exit(pair->mx);
return (NNG_EINVAL);
}
static void
pair_sender(void *arg)
{
pairpipe_t pp = arg;
pair_t pair = pp->pair;
nni_msgqueue_t uwq = pair->uwq;
nni_msgqueue_t urq = pair->urq;
nni_pipe_t pipe = pp->pipe;
nni_msg_t msg;
int rv;
nni_mutex_enter(pair->mx);
if (!pp->good) {
nni_mutex_exit(pair->mx);
return;
}
nni_mutex_exit(pair->mx);
for (;;) {
rv = nni_msgqueue_get_sig(uwq, &msg, -1, &pp->sigclose);
if (rv != 0) {
break;
}
rv = nni_pipe_send(pipe, msg);
if (rv != 0) {
nni_msg_free(msg);
break;
}
}
nni_msgqueue_signal(urq, &pp->sigclose);
nni_pipe_close(pipe);
nni_socket_remove_pipe(pair->sock, pipe);
}
static void
pair_receiver(void *arg)
{
pairpipe_t pp = arg;
pair_t pair = pp->pair;
nni_msgqueue_t urq = pair->urq;
nni_msgqueue_t uwq = pair->uwq;
nni_pipe_t pipe = pp->pipe;
nni_msg_t msg;
int rv;
nni_mutex_enter(pair->mx);
if (!pp->good) {
nni_mutex_exit(pair->mx);
return;
}
nni_mutex_exit(pair->mx);
for (;;) {
rv = nni_pipe_recv(pipe, &msg);
if (rv != 0) {
break;
}
rv = nni_msgqueue_put_sig(urq, msg, -1, &pp->sigclose);
if (rv != 0) {
nni_msg_free(msg);
break;
}
}
nni_msgqueue_signal(uwq, &pp->sigclose);
nni_pipe_close(pipe);
nni_socket_remove_pipe(pair->sock, pipe);
}
static int
pair_setopt(void *arg, int opt, const void *buf, size_t sz)
{
return (NNG_ENOTSUP);
}
static int
pair_getopt(void *arg, int opt, void *buf, size_t *szp)
{
return (NNG_ENOTSUP);
}
/*
* Global inproc state - this contains the list of active endpoints
* which we use for coordinating rendezvous.
*/
struct nni_protocol nni_pair_protocol = {
NNG_PROTO_PAIR, /* proto_self */
NNG_PROTO_PAIR, /* proto_peer */
"pair",
pair_create,
pair_destroy,
pair_shutdown,
pair_add_pipe,
pair_remove_pipe,
pair_setopt,
pair_getopt,
NULL, /* proto_recvfilter */
NULL, /* proto_sendfilter */
};
|
