forked from Qihoo360/Atlas
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathchassis-event-thread.c
More file actions
254 lines (204 loc) · 6.85 KB
/
chassis-event-thread.c
File metadata and controls
254 lines (204 loc) · 6.85 KB
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
/* $%BEGINLICENSE%$
Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; version 2 of the
License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
$%ENDLICENSE%$ */
#include <glib.h>
#include <errno.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* for write() */
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h> /* for SOCK_STREAM and AF_UNIX/AF_INET */
#endif
#ifdef WIN32
#include <winsock2.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <io.h> /* for write, read, _pipe etc */
#include <fcntl.h>
#undef WIN32_LEAN_AND_MEAN
#endif
#include <event.h>
#include "chassis-event-thread.h"
#define C(x) x, sizeof(x) - 1
#ifndef WIN32
#define closesocket(x) close(x)
#endif
/**
* add a event asynchronously
*
* the event is added to the global event-queue and a fd-notification is sent allowing any
* of the event-threads to handle it
*
* @see network_mysqld_con_handle()
*/
void chassis_event_add(network_mysqld_con* client_con) { //主线程执行，ping工作线程，使其初次进入状态机
chassis* chas = client_con->srv;
// choose a event thread
static guint last_thread = 1;
if (last_thread > chas->event_thread_count) last_thread = 1;
chassis_event_thread_t *thread = chas->threads->pdata[last_thread];
++last_thread;
g_async_queue_push(thread->event_queue, client_con);
if (write(thread->notify_send_fd, "", 1) != 1) g_error("pipes - write error: %s", g_strerror(errno));
}
static GPrivate tls_index;
void chassis_event_add_self(chassis* chas, struct event* ev, int timeout) { //工作线程执行，RETRY后将事件重新放入本线程的event_base中
guint index = GPOINTER_TO_UINT(g_private_get(&tls_index));
chassis_event_thread_t* thread = g_ptr_array_index(chas->threads, index);
struct event_base *event_base = thread->event_base;
event_base_set(event_base, ev);
if (timeout > 0) {
struct timeval tm = {timeout, 0};
event_add(ev, &tm);
} else {
event_add(ev, NULL);
}
}
/**
* add a event to the current thread
*
* needs event-base stored in the thread local storage
*
* @see network_connection_pool_lua_add_connection()
*/
void chassis_event_add_local(chassis *chas, struct event *ev) { //工作线程或回收线程执行，监听池中连接的超时事件EV_READ，用来销毁超时连接
guint index = GPOINTER_TO_UINT(g_private_get(&tls_index));
chassis_event_thread_t* thread = g_ptr_array_index(chas->threads, index);
struct event_base *event_base = thread->event_base;
g_assert(event_base); /* the thread-local event-base has to be initialized */
event_base_set(event_base, ev);
event_add(ev, NULL);
}
void chassis_event_handle(int G_GNUC_UNUSED event_fd, short G_GNUC_UNUSED events, void* user_data) {
chassis_event_thread_t* thread = user_data;
char ping[1];
if (read(thread->notify_receive_fd, ping, 1) != 1) g_error("pipes - read error");
network_mysqld_con* client_con = g_async_queue_try_pop(thread->event_queue);
if (client_con != NULL) network_mysqld_con_handle(-1, 0, client_con);
}
/**
* create the data structure for a new event-thread
*/
chassis_event_thread_t *chassis_event_thread_new(guint index) {
chassis_event_thread_t *thread = g_new0(chassis_event_thread_t, 1);
thread->index = index;
thread->event_queue = g_async_queue_new();
return thread;
}
/**
* free the data-structures for a event-thread
*
* joins the event-thread, closes notification-pipe and free's the event-base
*/
void chassis_event_thread_free(chassis_event_thread_t *thread) {
if (!thread) return;
if (thread->thr) g_thread_join(thread->thr);
if (thread->notify_receive_fd != -1) {
event_del(&(thread->notify_fd_event));
closesocket(thread->notify_receive_fd);
}
if (thread->notify_send_fd != -1) {
closesocket(thread->notify_send_fd);
}
/* we don't want to free the global event-base */
if (thread->thr != NULL && thread->event_base) event_base_free(thread->event_base);
network_mysqld_con* con;
while (con = g_async_queue_try_pop(thread->event_queue)) {
network_mysqld_con_free(con);
}
g_async_queue_unref(thread->event_queue);
g_free(thread);
}
/**
* setup the notification-fd of a event-thread
*
* all event-threads listen on the same notification pipe
*
* @see chassis_event_handle()
*/
int chassis_event_threads_init_thread(chassis_event_thread_t *thread, chassis *chas) {
thread->event_base = event_base_new();
thread->chas = chas;
int fds[2];
if (pipe(fds)) {
int err;
err = errno;
g_error("%s: evutil_socketpair() failed: %s (%d)",
G_STRLOC,
g_strerror(err),
err);
}
thread->notify_receive_fd = fds[0];
thread->notify_send_fd = fds[1];
event_set(&(thread->notify_fd_event), thread->notify_receive_fd, EV_READ | EV_PERSIST, chassis_event_handle, thread);
event_base_set(thread->event_base, &(thread->notify_fd_event));
event_add(&(thread->notify_fd_event), NULL);
return 0;
}
/**
* event-handler thread
*
*/
void *chassis_event_thread_loop(chassis_event_thread_t *thread) {
g_private_set(&tls_index, GUINT_TO_POINTER(thread->index));
/**
* check once a second if we shall shutdown the proxy
*/
while (!chassis_is_shutdown()) {
struct timeval timeout;
int r;
timeout.tv_sec = 1;
timeout.tv_usec = 0;
g_assert(event_base_loopexit(thread->event_base, &timeout) == 0);
r = event_base_dispatch(thread->event_base);
if (r == -1) {
#ifdef WIN32
errno = WSAGetLastError();
#endif
if (errno == EINTR) continue;
g_critical("%s: leaving chassis_event_thread_loop early, errno != EINTR was: %s (%d)", G_STRLOC, g_strerror(errno), errno);
break;
}
}
return NULL;
}
/**
* start all the event-threads
*
* starts all the event-threads that got added by chassis_event_threads_add()
*
* @see chassis_event_threads_add
*/
void chassis_event_threads_start(GPtrArray *threads) {
guint i;
g_message("%s: starting %d threads", G_STRLOC, threads->len - 1);
for (i = 1; i < threads->len; i++) { /* the 1st is the main-thread and already set up */
chassis_event_thread_t *thread = threads->pdata[i];
GError *gerr = NULL;
thread->thr = g_thread_create((GThreadFunc)chassis_event_thread_loop, thread, TRUE, &gerr);
if (gerr) {
g_critical("%s: %s", G_STRLOC, gerr->message);
g_error_free(gerr);
gerr = NULL;
}
}
}
network_connection_pool* chassis_event_thread_pool(network_backend_t* backend) {
guint index = GPOINTER_TO_UINT(g_private_get(&tls_index));
return g_ptr_array_index(backend->pools, index);
}