gio/gthreadedsocketservice.c

   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 ("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 }