1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
3 * soup-message-queue.c: Message queue
5 * Copyright (C) 2003 Novell, Inc.
6 * Copyright (C) 2008 Red Hat, Inc.
13 #include "soup-message-queue.h"
16 /* This is an internal structure used by #SoupSession and its
17 * subclasses to keep track of the status of messages currently being
20 * The #SoupMessageQueue itself is mostly just a linked list of
21 * #SoupMessageQueueItem, with some added cleverness to allow the list
22 * to be walked safely while other threads / re-entrant loops are
23 * adding items to and removing items from it. In particular, this is
24 * handled by refcounting items and then keeping "removed" items in
25 * the list until their ref_count drops to 0, but skipping over the
26 * "removed" ones when walking the queue.
29 struct _SoupMessageQueue {
33 SoupMessageQueueItem *head, *tail;
37 soup_message_queue_new (SoupSession *session)
39 SoupMessageQueue *queue;
41 queue = g_slice_new0 (SoupMessageQueue);
42 queue->session = session;
43 g_mutex_init (&queue->mutex);
48 soup_message_queue_destroy (SoupMessageQueue *queue)
50 g_return_if_fail (queue->head == NULL);
52 g_mutex_clear (&queue->mutex);
53 g_slice_free (SoupMessageQueue, queue);
57 queue_message_restarted (SoupMessage *msg, gpointer user_data)
59 SoupMessageQueueItem *item = user_data;
61 if (item->proxy_addr) {
62 g_object_unref (item->proxy_addr);
63 item->proxy_addr = NULL;
65 if (item->proxy_uri) {
66 soup_uri_free (item->proxy_uri);
67 item->proxy_uri = NULL;
70 g_cancellable_reset (item->cancellable);
74 * soup_message_queue_append:
75 * @queue: a #SoupMessageQueue
76 * @msg: a #SoupMessage
77 * @callback: the callback for @msg
78 * @user_data: the data to pass to @callback
80 * Creates a new #SoupMessageQueueItem and appends it to @queue.
82 * Return value: the new item, which you must unref with
83 * soup_message_queue_unref_item() when you are done with.
85 SoupMessageQueueItem *
86 soup_message_queue_append (SoupMessageQueue *queue, SoupMessage *msg,
87 SoupSessionCallback callback, gpointer user_data)
89 SoupMessageQueueItem *item;
91 item = g_slice_new0 (SoupMessageQueueItem);
92 item->session = g_object_ref (queue->session);
93 item->async_context = soup_session_get_async_context (item->session);
95 item->msg = g_object_ref (msg);
96 item->callback = callback;
97 item->callback_data = user_data;
98 item->cancellable = g_cancellable_new ();
100 g_signal_connect (msg, "restarted",
101 G_CALLBACK (queue_message_restarted), item);
103 /* Note: the initial ref_count of 1 represents the caller's
104 * ref; the queue's own ref is indicated by the absence of the
109 g_mutex_lock (&queue->mutex);
111 queue->tail->next = item;
112 item->prev = queue->tail;
115 queue->head = queue->tail = item;
117 g_mutex_unlock (&queue->mutex);
122 * soup_message_queue_item_ref:
123 * @item: a #SoupMessageQueueItem
128 soup_message_queue_item_ref (SoupMessageQueueItem *item)
134 * soup_message_queue_item_unref:
135 * @item: a #SoupMessageQueueItem
137 * Unrefs @item; use this on a #SoupMessageQueueItem that you are done
138 * with (but that you aren't passing to
139 * soup_message_queue_item_next()).
142 soup_message_queue_item_unref (SoupMessageQueueItem *item)
144 g_mutex_lock (&item->queue->mutex);
146 /* Decrement the ref_count; if it's still non-zero OR if the
147 * item is still in the queue, then return.
149 if (--item->ref_count || !item->removed) {
150 g_mutex_unlock (&item->queue->mutex);
154 g_warn_if_fail (item->conn == NULL);
156 /* OK, @item is dead. Rewrite @queue around it */
158 item->prev->next = item->next;
160 item->queue->head = item->next;
162 item->next->prev = item->prev;
164 item->queue->tail = item->prev;
166 g_mutex_unlock (&item->queue->mutex);
169 g_signal_handlers_disconnect_by_func (item->msg,
170 queue_message_restarted, item);
171 g_object_unref (item->session);
172 g_object_unref (item->msg);
173 g_object_unref (item->cancellable);
174 g_clear_object (&item->proxy_addr);
175 g_clear_pointer (&item->proxy_uri, soup_uri_free);
176 g_clear_object (&item->task);
177 if (item->io_source) {
178 g_source_destroy (item->io_source);
179 g_source_unref (item->io_source);
181 g_slice_free (SoupMessageQueueItem, item);
185 * soup_message_queue_lookup:
186 * @queue: a #SoupMessageQueue
187 * @msg: a #SoupMessage
189 * Finds the #SoupMessageQueueItem for @msg in @queue. You must unref
190 * the item with soup_message_queue_unref_item() when you are done
193 * Return value: the queue item for @msg, or %NULL
195 SoupMessageQueueItem *
196 soup_message_queue_lookup (SoupMessageQueue *queue, SoupMessage *msg)
198 SoupMessageQueueItem *item;
200 g_mutex_lock (&queue->mutex);
203 while (item && (item->removed || item->msg != msg))
209 g_mutex_unlock (&queue->mutex);
214 * soup_message_queue_first:
215 * @queue: a #SoupMessageQueue
217 * Gets the first item in @queue. You must unref the item by calling
218 * soup_message_queue_unref_item() on it when you are done.
219 * (soup_message_queue_next() does this for you automatically, so you
220 * only need to unref the item yourself if you are not going to
221 * finishing walking the queue.)
223 * Return value: the first item in @queue.
225 SoupMessageQueueItem *
226 soup_message_queue_first (SoupMessageQueue *queue)
228 SoupMessageQueueItem *item;
230 g_mutex_lock (&queue->mutex);
233 while (item && item->removed)
239 g_mutex_unlock (&queue->mutex);
244 * soup_message_queue_next:
245 * @queue: a #SoupMessageQueue
246 * @item: a #SoupMessageQueueItem
248 * Unrefs @item and gets the next item after it in @queue. As with
249 * soup_message_queue_first(), you must unref the returned item
250 * yourself with soup_message_queue_unref_item() if you do not finish
253 * Return value: the next item in @queue.
255 SoupMessageQueueItem *
256 soup_message_queue_next (SoupMessageQueue *queue, SoupMessageQueueItem *item)
258 SoupMessageQueueItem *next;
260 g_mutex_lock (&queue->mutex);
263 while (next && next->removed)
268 g_mutex_unlock (&queue->mutex);
269 soup_message_queue_item_unref (item);
274 * soup_message_queue_remove:
275 * @queue: a #SoupMessageQueue
276 * @item: a #SoupMessageQueueItem
278 * Removes @item from @queue. Note that you probably also need to call
279 * soup_message_queue_unref_item() after this.
282 soup_message_queue_remove (SoupMessageQueue *queue, SoupMessageQueueItem *item)
284 g_return_if_fail (!item->removed);
286 g_mutex_lock (&queue->mutex);
287 item->removed = TRUE;
288 g_mutex_unlock (&queue->mutex);