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
|
/*
*
* 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/iomgr/iomgr.h"
#include <stdlib.h>
#include "src/core/iomgr/iomgr_internal.h"
#include "src/core/iomgr/alarm_internal.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/thd.h>
#include <grpc/support/sync.h>
typedef struct delayed_callback {
grpc_iomgr_cb_func cb;
void *cb_arg;
int success;
struct delayed_callback *next;
} delayed_callback;
static gpr_mu g_mu;
static gpr_cv g_cv;
static gpr_cv g_rcv;
static delayed_callback *g_cbs_head = NULL;
static delayed_callback *g_cbs_tail = NULL;
static int g_shutdown;
static int g_refs;
static gpr_event g_background_callback_executor_done;
/* Execute followup callbacks continuously.
Other threads may check in and help during pollset_work() */
static void background_callback_executor(void *ignored) {
gpr_mu_lock(&g_mu);
while (!g_shutdown) {
gpr_timespec deadline = gpr_inf_future;
if (g_cbs_head) {
delayed_callback *cb = g_cbs_head;
g_cbs_head = cb->next;
if (!g_cbs_head) g_cbs_tail = NULL;
gpr_mu_unlock(&g_mu);
cb->cb(cb->cb_arg, cb->success);
gpr_free(cb);
gpr_mu_lock(&g_mu);
} else if (grpc_alarm_check(&g_mu, gpr_now(), &deadline)) {
} else {
gpr_cv_wait(&g_cv, &g_mu, deadline);
}
}
gpr_mu_unlock(&g_mu);
gpr_event_set(&g_background_callback_executor_done, (void *)1);
}
void grpc_kick_poller(void) { gpr_cv_broadcast(&g_cv); }
void grpc_iomgr_init(void) {
gpr_thd_id id;
gpr_mu_init(&g_mu);
gpr_cv_init(&g_cv);
gpr_cv_init(&g_rcv);
grpc_alarm_list_init(gpr_now());
g_refs = 0;
grpc_iomgr_platform_init();
gpr_event_init(&g_background_callback_executor_done);
gpr_thd_new(&id, background_callback_executor, NULL, NULL);
}
void grpc_iomgr_shutdown(void) {
delayed_callback *cb;
gpr_timespec shutdown_deadline =
gpr_time_add(gpr_now(), gpr_time_from_seconds(10));
gpr_mu_lock(&g_mu);
g_shutdown = 1;
while (g_cbs_head || g_refs) {
gpr_log(GPR_DEBUG, "Waiting for %d iomgr objects to be destroyed%s", g_refs,
g_cbs_head ? " and executing final callbacks" : "");
while (g_cbs_head) {
cb = g_cbs_head;
g_cbs_head = cb->next;
if (!g_cbs_head) g_cbs_tail = NULL;
gpr_mu_unlock(&g_mu);
cb->cb(cb->cb_arg, 0);
gpr_free(cb);
gpr_mu_lock(&g_mu);
}
if (g_refs) {
if (gpr_cv_wait(&g_rcv, &g_mu, shutdown_deadline) && g_cbs_head == NULL) {
gpr_log(GPR_DEBUG,
"Failed to free %d iomgr objects before shutdown deadline: "
"memory leaks are likely",
g_refs);
break;
}
}
}
gpr_mu_unlock(&g_mu);
grpc_kick_poller();
gpr_event_wait(&g_background_callback_executor_done, gpr_inf_future);
grpc_iomgr_platform_shutdown();
grpc_alarm_list_shutdown();
gpr_mu_destroy(&g_mu);
gpr_cv_destroy(&g_cv);
gpr_cv_destroy(&g_rcv);
}
void grpc_iomgr_ref(void) {
gpr_mu_lock(&g_mu);
++g_refs;
gpr_mu_unlock(&g_mu);
}
void grpc_iomgr_unref(void) {
gpr_mu_lock(&g_mu);
if (0 == --g_refs) {
gpr_cv_signal(&g_rcv);
}
gpr_mu_unlock(&g_mu);
}
void grpc_iomgr_add_delayed_callback(grpc_iomgr_cb_func cb, void *cb_arg,
int success) {
delayed_callback *dcb = gpr_malloc(sizeof(delayed_callback));
dcb->cb = cb;
dcb->cb_arg = cb_arg;
dcb->success = success;
gpr_mu_lock(&g_mu);
dcb->next = NULL;
if (!g_cbs_tail) {
g_cbs_head = g_cbs_tail = dcb;
} else {
g_cbs_tail->next = dcb;
g_cbs_tail = dcb;
}
gpr_cv_signal(&g_cv);
gpr_mu_unlock(&g_mu);
}
void grpc_iomgr_add_callback(grpc_iomgr_cb_func cb, void *cb_arg) {
grpc_iomgr_add_delayed_callback(cb, cb_arg, 1);
}
int grpc_maybe_call_delayed_callbacks(gpr_mu *drop_mu, int success) {
int n = 0;
gpr_mu *retake_mu = NULL;
delayed_callback *cb;
for (;;) {
/* check for new work */
if (!gpr_mu_trylock(&g_mu)) {
break;
}
cb = g_cbs_head;
if (!cb) {
gpr_mu_unlock(&g_mu);
break;
}
g_cbs_head = cb->next;
if (!g_cbs_head) g_cbs_tail = NULL;
gpr_mu_unlock(&g_mu);
/* if we have a mutex to drop, do so before executing work */
if (drop_mu) {
gpr_mu_unlock(drop_mu);
retake_mu = drop_mu;
drop_mu = NULL;
}
cb->cb(cb->cb_arg, success && cb->success);
gpr_free(cb);
n++;
}
if (retake_mu) {
gpr_mu_lock(retake_mu);
}
return n;
}
|
