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, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  *
  21  * Authors: Ryan Lortie <desrt@desrt.ca>
  22  *          Alexander Larsson <alexl@redhat.com>
  23  */
  24
  25 /**
  26  * SECTION:gthreadedsocketservice
  27  * @title: GThreadedSocketService
  28  * @short_description: A threaded GSocketService
  29  * @see_also: #GSocketService.
  30  *
  31  * A #GThreadedSocketService is a simple subclass of #GSocketService
  32  * that handles incoming connections by creating a worker thread and
  33  * dispatching the connection to it by emitting the
  34  * #GThreadedSocketService::run signal in the new thread.
  35  *
  36  * The signal handler may perform blocking IO and need not return
  37  * until the connection is closed.
  38  *
  39  * The service is implemented using a thread pool, so there is a
  40  * limited amount of threads available to serve incoming requests.
  41  * The service automatically stops the #GSocketService from accepting
  42  * new connections when all threads are busy.
  43  *
  44  * As with #GSocketService, you may connect to #GThreadedSocketService::run,
  45  * or subclass and override the default handler.
  46  */
  47
  48 #include "config.h"
  49 #include "gsocketconnection.h"
  50 #include "gthreadedsocketservice.h"
  51 #include "glibintl.h"
  52
  53 struct _GThreadedSocketServicePrivate
  54 {
  55   GThreadPool *thread_pool;
  56   int max_threads;
  57   gint job_count;
  58 };
  59
  60 static guint g_threaded_socket_service_run_signal;
  61
  62 G_DEFINE_TYPE_WITH_PRIVATE (GThreadedSocketService,
  63                             g_threaded_socket_service,
  64                             G_TYPE_SOCKET_SERVICE)
  65
  66 enum
  67 {
  68   PROP_0,
  69   PROP_MAX_THREADS
  70 };
  71
  72 G_LOCK_DEFINE_STATIC(job_count);
  73
  74 typedef struct
  75 {
  76   GThreadedSocketService *service;
  77   GSocketConnection *connection;
  78   GObject *source_object;
  79 } GThreadedSocketServiceData;
  80
  81 static void
  82 g_threaded_socket_service_func (gpointer _data,
  83                                 gpointer user_data)
  84 {
  85   GThreadedSocketService *threaded = user_data;
  86   GThreadedSocketServiceData *data = _data;
  87   gboolean result;
  88
  89   g_signal_emit (data->service, g_threaded_socket_service_run_signal,
  90                  0, data->connection, data->source_object, &result);
  91
  92   g_object_unref (data->service);
  93   g_object_unref (data->connection);
  94   if (data->source_object)
  95     g_object_unref (data->source_object);
  96   g_slice_free (GThreadedSocketServiceData, data);
  97
  98   G_LOCK (job_count);
  99   if (threaded->priv->job_count-- == threaded->priv->max_threads)
 100     g_socket_service_start (G_SOCKET_SERVICE (threaded));
 101   G_UNLOCK (job_count);
 102 }
 103
 104 static gboolean
 105 g_threaded_socket_service_incoming (GSocketService    *service,
 106                                     GSocketConnection *connection,
 107                                     GObject           *source_object)
 108 {
 109   GThreadedSocketService *threaded;
 110   GThreadedSocketServiceData *data;
 111
 112   threaded = G_THREADED_SOCKET_SERVICE (service);
 113
 114   data = g_slice_new (GThreadedSocketServiceData);
 115   data->service = g_object_ref (service);
 116   data->connection = g_object_ref (connection);
 117   if (source_object)
 118     data->source_object = g_object_ref (source_object);
 119   else
 120     data->source_object = NULL;
 121
 122   G_LOCK (job_count);
 123   if (++threaded->priv->job_count == threaded->priv->max_threads)
 124     g_socket_service_stop (service);
 125   G_UNLOCK (job_count);
 126
 127   g_thread_pool_push (threaded->priv->thread_pool, data, NULL);
 128
 129
 130
 131   return FALSE;
 132 }
 133
 134 static void
 135 g_threaded_socket_service_init (GThreadedSocketService *service)
 136 {
 137   service->priv = g_threaded_socket_service_get_instance_private (service);
 138   service->priv->max_threads = 10;
 139 }
 140
 141 static void
 142 g_threaded_socket_service_constructed (GObject *object)
 143 {
 144   GThreadedSocketService *service = G_THREADED_SOCKET_SERVICE (object);
 145
 146   service->priv->thread_pool =
 147     g_thread_pool_new  (g_threaded_socket_service_func,
 148                         service,
 149                         service->priv->max_threads,
 150                         FALSE,
 151                         NULL);
 152 }
 153
 154
 155 static void
 156 g_threaded_socket_service_finalize (GObject *object)
 157 {
 158   GThreadedSocketService *service = G_THREADED_SOCKET_SERVICE (object);
 159
 160   g_thread_pool_free (service->priv->thread_pool, FALSE, TRUE);
 161
 162   G_OBJECT_CLASS (g_threaded_socket_service_parent_class)
 163     ->finalize (object);
 164 }
 165
 166 static void
 167 g_threaded_socket_service_get_property (GObject    *object,
 168                                         guint       prop_id,
 169                                         GValue     *value,
 170                                         GParamSpec *pspec)
 171 {
 172   GThreadedSocketService *service = G_THREADED_SOCKET_SERVICE (object);
 173
 174   switch (prop_id)
 175     {
 176       case PROP_MAX_THREADS:
 177         g_value_set_int (value, service->priv->max_threads);
 178         break;
 179
 180       default:
 181         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 182     }
 183 }
 184
 185 static void
 186 g_threaded_socket_service_set_property (GObject      *object,
 187                                         guint         prop_id,
 188                                         const GValue *value,
 189                                         GParamSpec   *pspec)
 190 {
 191   GThreadedSocketService *service = G_THREADED_SOCKET_SERVICE (object);
 192
 193   switch (prop_id)
 194     {
 195       case PROP_MAX_THREADS:
 196         service->priv->max_threads = g_value_get_int (value);
 197         break;
 198
 199       default:
 200         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 201     }
 202 }
 203
 204
 205 static void
 206 g_threaded_socket_service_class_init (GThreadedSocketServiceClass *class)
 207 {
 208   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 209   GSocketServiceClass *ss_class = &class->parent_class;
 210
 211   gobject_class->constructed = g_threaded_socket_service_constructed;
 212   gobject_class->finalize = g_threaded_socket_service_finalize;
 213   gobject_class->set_property = g_threaded_socket_service_set_property;
 214   gobject_class->get_property = g_threaded_socket_service_get_property;
 215
 216   ss_class->incoming = g_threaded_socket_service_incoming;
 217
 218   /**
 219    * GThreadedSocketService::run:
 220    * @service: the #GThreadedSocketService.
 221    * @connection: a new #GSocketConnection object.
 222    * @source_object: the source_object passed to g_socket_listener_add_address().
 223    *
 224    * The ::run signal is emitted in a worker thread in response to an
 225    * incoming connection. This thread is dedicated to handling
 226    * @connection and may perform blocking IO. The signal handler need
 227    * not return until the connection is closed.
 228    *
 229    * Returns: %TRUE to stop further signal handlers from being called
 230    */
 231   g_threaded_socket_service_run_signal =
 232     g_signal_new ("run", G_TYPE_FROM_CLASS (class), G_SIGNAL_RUN_LAST,
 233                   G_STRUCT_OFFSET (GThreadedSocketServiceClass, run),
 234                   g_signal_accumulator_true_handled, NULL,
 235                   NULL, G_TYPE_BOOLEAN,
 236                   2, G_TYPE_SOCKET_CONNECTION, G_TYPE_OBJECT);
 237
 238   g_object_class_install_property (gobject_class, PROP_MAX_THREADS,
 239                                    g_param_spec_int ("max-threads",
 240                                                      P_("Max threads"),
 241                                                      P_("The max number of threads handling clients for this service"),
 242                                                      -1,
 243                                                      G_MAXINT,
 244                                                      10,
 245                                                      G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 246 }
 247
 248 /**
 249  * g_threaded_socket_service_new:
 250  * @max_threads: the maximal number of threads to execute concurrently
 251  *   handling incoming clients, -1 means no limit
 252  *
 253  * Creates a new #GThreadedSocketService with no listeners. Listeners
 254  * must be added with one of the #GSocketListener "add" methods.
 255  *
 256  * Returns: a new #GSocketService.
 257  *
 258  * Since: 2.22
 259  */
 260 GSocketService *
 261 g_threaded_socket_service_new (int max_threads)
 262 {
 263   return g_object_new (G_TYPE_THREADED_SOCKET_SERVICE,
 264                        "max-threads", max_threads,
 265                        NULL);
 266 }