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
|
/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "src/core/lib/iomgr/port.h"
#ifdef GRPC_WINSOCK_SOCKET
#include <grpc/support/log.h>
#include <grpc/support/thd.h>
#include "src/core/lib/iomgr/iocp_windows.h"
#include "src/core/lib/iomgr/iomgr_internal.h"
#include "src/core/lib/iomgr/pollset.h"
#include "src/core/lib/iomgr/pollset_windows.h"
gpr_mu grpc_polling_mu;
static grpc_pollset_worker *g_active_poller;
static grpc_pollset_worker g_global_root_worker;
void grpc_pollset_global_init(void) {
gpr_mu_init(&grpc_polling_mu);
g_active_poller = NULL;
g_global_root_worker.links[GRPC_POLLSET_WORKER_LINK_GLOBAL].next =
g_global_root_worker.links[GRPC_POLLSET_WORKER_LINK_GLOBAL].prev =
&g_global_root_worker;
}
void grpc_pollset_global_shutdown(void) { gpr_mu_destroy(&grpc_polling_mu); }
static void remove_worker(grpc_pollset_worker *worker,
grpc_pollset_worker_link_type type) {
worker->links[type].prev->links[type].next = worker->links[type].next;
worker->links[type].next->links[type].prev = worker->links[type].prev;
worker->links[type].next = worker->links[type].prev = worker;
}
static int has_workers(grpc_pollset_worker *root,
grpc_pollset_worker_link_type type) {
return root->links[type].next != root;
}
static grpc_pollset_worker *pop_front_worker(
grpc_pollset_worker *root, grpc_pollset_worker_link_type type) {
if (has_workers(root, type)) {
grpc_pollset_worker *w = root->links[type].next;
remove_worker(w, type);
return w;
} else {
return NULL;
}
}
static void push_front_worker(grpc_pollset_worker *root,
grpc_pollset_worker_link_type type,
grpc_pollset_worker *worker) {
worker->links[type].prev = root;
worker->links[type].next = worker->links[type].prev->links[type].next;
worker->links[type].prev->links[type].next =
worker->links[type].next->links[type].prev = worker;
}
size_t grpc_pollset_size(void) { return sizeof(grpc_pollset); }
/* There isn't really any such thing as a pollset under Windows, due to the
nature of the IO completion ports. We're still going to provide a minimal
set of features for the sake of the rest of grpc. But grpc_pollset_work
won't actually do any polling, and return as quickly as possible. */
void grpc_pollset_init(grpc_pollset *pollset, gpr_mu **mu) {
*mu = &grpc_polling_mu;
memset(pollset, 0, sizeof(*pollset));
pollset->root_worker.links[GRPC_POLLSET_WORKER_LINK_POLLSET].next =
pollset->root_worker.links[GRPC_POLLSET_WORKER_LINK_POLLSET].prev =
&pollset->root_worker;
}
void grpc_pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
grpc_closure *closure) {
pollset->shutting_down = 1;
grpc_pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST);
if (!pollset->is_iocp_worker) {
grpc_exec_ctx_sched(exec_ctx, closure, GRPC_ERROR_NONE, NULL);
} else {
pollset->on_shutdown = closure;
}
}
void grpc_pollset_destroy(grpc_pollset *pollset) {}
void grpc_pollset_reset(grpc_pollset *pollset) {
GPR_ASSERT(pollset->shutting_down);
GPR_ASSERT(
!has_workers(&pollset->root_worker, GRPC_POLLSET_WORKER_LINK_POLLSET));
pollset->shutting_down = 0;
pollset->is_iocp_worker = 0;
pollset->kicked_without_pollers = 0;
pollset->on_shutdown = NULL;
}
grpc_error *grpc_pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
grpc_pollset_worker **worker_hdl,
gpr_timespec now, gpr_timespec deadline) {
grpc_pollset_worker worker;
*worker_hdl = &worker;
int added_worker = 0;
worker.links[GRPC_POLLSET_WORKER_LINK_POLLSET].next =
worker.links[GRPC_POLLSET_WORKER_LINK_POLLSET].prev =
worker.links[GRPC_POLLSET_WORKER_LINK_GLOBAL].next =
worker.links[GRPC_POLLSET_WORKER_LINK_GLOBAL].prev = NULL;
worker.kicked = 0;
worker.pollset = pollset;
gpr_cv_init(&worker.cv);
if (!pollset->kicked_without_pollers && !pollset->shutting_down) {
if (g_active_poller == NULL) {
grpc_pollset_worker *next_worker;
/* become poller */
pollset->is_iocp_worker = 1;
g_active_poller = &worker;
gpr_mu_unlock(&grpc_polling_mu);
grpc_iocp_work(exec_ctx, deadline);
grpc_exec_ctx_flush(exec_ctx);
gpr_mu_lock(&grpc_polling_mu);
pollset->is_iocp_worker = 0;
g_active_poller = NULL;
/* try to get a worker from this pollsets worker list */
next_worker = pop_front_worker(&pollset->root_worker,
GRPC_POLLSET_WORKER_LINK_POLLSET);
if (next_worker == NULL) {
/* try to get a worker from the global list */
next_worker = pop_front_worker(&g_global_root_worker,
GRPC_POLLSET_WORKER_LINK_GLOBAL);
}
if (next_worker != NULL) {
next_worker->kicked = 1;
gpr_cv_signal(&next_worker->cv);
}
if (pollset->shutting_down && pollset->on_shutdown != NULL) {
grpc_exec_ctx_sched(exec_ctx, pollset->on_shutdown, GRPC_ERROR_NONE,
NULL);
pollset->on_shutdown = NULL;
}
goto done;
}
push_front_worker(&g_global_root_worker, GRPC_POLLSET_WORKER_LINK_GLOBAL,
&worker);
push_front_worker(&pollset->root_worker, GRPC_POLLSET_WORKER_LINK_POLLSET,
&worker);
added_worker = 1;
while (!worker.kicked) {
if (gpr_cv_wait(&worker.cv, &grpc_polling_mu, deadline)) {
break;
}
}
} else {
pollset->kicked_without_pollers = 0;
}
done:
if (!grpc_closure_list_empty(exec_ctx->closure_list)) {
gpr_mu_unlock(&grpc_polling_mu);
grpc_exec_ctx_flush(exec_ctx);
gpr_mu_lock(&grpc_polling_mu);
}
if (added_worker) {
remove_worker(&worker, GRPC_POLLSET_WORKER_LINK_GLOBAL);
remove_worker(&worker, GRPC_POLLSET_WORKER_LINK_POLLSET);
}
gpr_cv_destroy(&worker.cv);
*worker_hdl = NULL;
return GRPC_ERROR_NONE;
}
grpc_error *grpc_pollset_kick(grpc_pollset *p,
grpc_pollset_worker *specific_worker) {
if (specific_worker != NULL) {
if (specific_worker == GRPC_POLLSET_KICK_BROADCAST) {
for (specific_worker =
p->root_worker.links[GRPC_POLLSET_WORKER_LINK_POLLSET].next;
specific_worker != &p->root_worker;
specific_worker =
specific_worker->links[GRPC_POLLSET_WORKER_LINK_POLLSET].next) {
specific_worker->kicked = 1;
gpr_cv_signal(&specific_worker->cv);
}
p->kicked_without_pollers = 1;
if (p->is_iocp_worker) {
grpc_iocp_kick();
}
} else {
if (p->is_iocp_worker && g_active_poller == specific_worker) {
grpc_iocp_kick();
} else {
specific_worker->kicked = 1;
gpr_cv_signal(&specific_worker->cv);
}
}
} else {
specific_worker =
pop_front_worker(&p->root_worker, GRPC_POLLSET_WORKER_LINK_POLLSET);
if (specific_worker != NULL) {
grpc_pollset_kick(p, specific_worker);
} else if (p->is_iocp_worker) {
grpc_iocp_kick();
} else {
p->kicked_without_pollers = 1;
}
}
return GRPC_ERROR_NONE;
}
void grpc_kick_poller(void) { grpc_iocp_kick(); }
#endif /* GRPC_WINSOCK_SOCKET */
|
