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1 office 1 /* GIO - GLib Input, Output and Streaming Library
2 *
3 * Copyright © 2009 Codethink Limited
4 * Copyright © 2009 Red Hat, Inc
5 *
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License as published
8 * by the Free Software Foundation; either version 2 of the licence or (at
9 * your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General
17 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 *
19 * Authors: Ryan Lortie <desrt@desrt.ca>
20 * Alexander Larsson <alexl@redhat.com>
21 */
22  
23 /**
24 * SECTION:gthreadedsocketservice
25 * @title: GThreadedSocketService
26 * @short_description: A threaded GSocketService
27 * @include: gio/gio.h
28 * @see_also: #GSocketService.
29 *
30 * A #GThreadedSocketService is a simple subclass of #GSocketService
31 * that handles incoming connections by creating a worker thread and
32 * dispatching the connection to it by emitting the
33 * #GThreadedSocketService::run signal in the new thread.
34 *
35 * The signal handler may perform blocking IO and need not return
36 * until the connection is closed.
37 *
38 * The service is implemented using a thread pool, so there is a
39 * limited amount of threads available to serve incoming requests.
40 * The service automatically stops the #GSocketService from accepting
41 * new connections when all threads are busy.
42 *
43 * As with #GSocketService, you may connect to #GThreadedSocketService::run,
44 * or subclass and override the default handler.
45 */
46  
47 #include "config.h"
48 #include "gsocketconnection.h"
49 #include "gthreadedsocketservice.h"
50 #include "glibintl.h"
51  
52 struct _GThreadedSocketServicePrivate
53 {
54 GThreadPool *thread_pool;
55 int max_threads;
56 gint job_count;
57 };
58  
59 static guint g_threaded_socket_service_run_signal;
60  
61 G_DEFINE_TYPE_WITH_PRIVATE (GThreadedSocketService,
62 g_threaded_socket_service,
63 G_TYPE_SOCKET_SERVICE)
64  
65 enum
66 {
67 PROP_0,
68 PROP_MAX_THREADS
69 };
70  
71 G_LOCK_DEFINE_STATIC(job_count);
72  
73 typedef struct
74 {
75 GSocketConnection *connection;
76 GObject *source_object;
77 } GThreadedSocketServiceData;
78  
79 static void
80 g_threaded_socket_service_func (gpointer _data,
81 gpointer user_data)
82 {
83 GThreadedSocketService *threaded = user_data;
84 GThreadedSocketServiceData *data = _data;
85 gboolean result;
86  
87 g_signal_emit (threaded, g_threaded_socket_service_run_signal,
88 0, data->connection, data->source_object, &result);
89  
90 g_object_unref (data->connection);
91 if (data->source_object)
92 g_object_unref (data->source_object);
93 g_slice_free (GThreadedSocketServiceData, data);
94  
95 G_LOCK (job_count);
96 if (threaded->priv->job_count-- == threaded->priv->max_threads)
97 g_socket_service_start (G_SOCKET_SERVICE (threaded));
98 G_UNLOCK (job_count);
99  
100 g_object_unref (threaded);
101 }
102  
103 static gboolean
104 g_threaded_socket_service_incoming (GSocketService *service,
105 GSocketConnection *connection,
106 GObject *source_object)
107 {
108 GThreadedSocketService *threaded;
109 GThreadedSocketServiceData *data;
110  
111 threaded = G_THREADED_SOCKET_SERVICE (service);
112  
113 data = g_slice_new (GThreadedSocketServiceData);
114  
115 /* Ref the socket service for the thread */
116 g_object_ref (service);
117  
118 data->connection = g_object_ref (connection);
119 if (source_object)
120 data->source_object = g_object_ref (source_object);
121 else
122 data->source_object = NULL;
123  
124 G_LOCK (job_count);
125 if (++threaded->priv->job_count == threaded->priv->max_threads)
126 g_socket_service_stop (service);
127 G_UNLOCK (job_count);
128  
129 g_thread_pool_push (threaded->priv->thread_pool, data, NULL);
130  
131  
132  
133 return FALSE;
134 }
135  
136 static void
137 g_threaded_socket_service_init (GThreadedSocketService *service)
138 {
139 service->priv = g_threaded_socket_service_get_instance_private (service);
140 service->priv->max_threads = 10;
141 }
142  
143 static void
144 g_threaded_socket_service_constructed (GObject *object)
145 {
146 GThreadedSocketService *service = G_THREADED_SOCKET_SERVICE (object);
147  
148 service->priv->thread_pool =
149 g_thread_pool_new (g_threaded_socket_service_func,
150 service,
151 service->priv->max_threads,
152 FALSE,
153 NULL);
154 }
155  
156  
157 static void
158 g_threaded_socket_service_finalize (GObject *object)
159 {
160 GThreadedSocketService *service = G_THREADED_SOCKET_SERVICE (object);
161  
162 g_thread_pool_free (service->priv->thread_pool, FALSE, FALSE);
163  
164 G_OBJECT_CLASS (g_threaded_socket_service_parent_class)
165 ->finalize (object);
166 }
167  
168 static void
169 g_threaded_socket_service_get_property (GObject *object,
170 guint prop_id,
171 GValue *value,
172 GParamSpec *pspec)
173 {
174 GThreadedSocketService *service = G_THREADED_SOCKET_SERVICE (object);
175  
176 switch (prop_id)
177 {
178 case PROP_MAX_THREADS:
179 g_value_set_int (value, service->priv->max_threads);
180 break;
181  
182 default:
183 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
184 }
185 }
186  
187 static void
188 g_threaded_socket_service_set_property (GObject *object,
189 guint prop_id,
190 const GValue *value,
191 GParamSpec *pspec)
192 {
193 GThreadedSocketService *service = G_THREADED_SOCKET_SERVICE (object);
194  
195 switch (prop_id)
196 {
197 case PROP_MAX_THREADS:
198 service->priv->max_threads = g_value_get_int (value);
199 break;
200  
201 default:
202 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
203 }
204 }
205  
206  
207 static void
208 g_threaded_socket_service_class_init (GThreadedSocketServiceClass *class)
209 {
210 GObjectClass *gobject_class = G_OBJECT_CLASS (class);
211 GSocketServiceClass *ss_class = &class->parent_class;
212  
213 gobject_class->constructed = g_threaded_socket_service_constructed;
214 gobject_class->finalize = g_threaded_socket_service_finalize;
215 gobject_class->set_property = g_threaded_socket_service_set_property;
216 gobject_class->get_property = g_threaded_socket_service_get_property;
217  
218 ss_class->incoming = g_threaded_socket_service_incoming;
219  
220 /**
221 * GThreadedSocketService::run:
222 * @service: the #GThreadedSocketService.
223 * @connection: a new #GSocketConnection object.
224 * @source_object: the source_object passed to g_socket_listener_add_address().
225 *
226 * The ::run signal is emitted in a worker thread in response to an
227 * incoming connection. This thread is dedicated to handling
228 * @connection and may perform blocking IO. The signal handler need
229 * not return until the connection is closed.
230 *
231 * Returns: %TRUE to stop further signal handlers from being called
232 */
233 g_threaded_socket_service_run_signal =
234 g_signal_new (I_("run"), G_TYPE_FROM_CLASS (class), G_SIGNAL_RUN_LAST,
235 G_STRUCT_OFFSET (GThreadedSocketServiceClass, run),
236 g_signal_accumulator_true_handled, NULL,
237 NULL, G_TYPE_BOOLEAN,
238 2, G_TYPE_SOCKET_CONNECTION, G_TYPE_OBJECT);
239  
240 g_object_class_install_property (gobject_class, PROP_MAX_THREADS,
241 g_param_spec_int ("max-threads",
242 P_("Max threads"),
243 P_("The max number of threads handling clients for this service"),
244 -1,
245 G_MAXINT,
246 10,
247 G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
248 }
249  
250 /**
251 * g_threaded_socket_service_new:
252 * @max_threads: the maximal number of threads to execute concurrently
253 * handling incoming clients, -1 means no limit
254 *
255 * Creates a new #GThreadedSocketService with no listeners. Listeners
256 * must be added with one of the #GSocketListener "add" methods.
257 *
258 * Returns: a new #GSocketService.
259 *
260 * Since: 2.22
261 */
262 GSocketService *
263 g_threaded_socket_service_new (int max_threads)
264 {
265 return g_object_new (G_TYPE_THREADED_SOCKET_SERVICE,
266 "max-threads", max_threads,
267 NULL);
268 }