TOOK_LOCK_CHECK (connection); \
} while (0)
-#define CONNECTION_UNLOCK(connection) do { \
- if (TRACE_LOCKS) { _dbus_verbose ("UNLOCK\n"); } \
- RELEASING_LOCK_CHECK (connection); \
- _dbus_mutex_unlock ((connection)->mutex); \
- } while (0)
+#define CONNECTION_UNLOCK(connection) _dbus_connection_unlock (connection)
#define SLOTS_LOCK(connection) do { \
_dbus_mutex_lock ((connection)->slot_mutex); \
DBusList *outgoing_messages; /**< Queue of messages we need to send, send the end of the list first. */
DBusList *incoming_messages; /**< Queue of messages we have received, end of the list received most recently. */
+ DBusList *expired_messages; /**< Messages that will be released when we next unlock. */
DBusMessage *message_borrowed; /**< Filled in if the first incoming message has been borrowed;
* dispatch_acquired will be set by the borrower
DBusDispatchStatus last_dispatch_status; /**< The last dispatch status we reported to the application. */
- DBusList *link_cache; /**< A cache of linked list links to prevent contention
- * for the global linked list mempool lock
- */
DBusObjectTree *objects; /**< Object path handlers registered with this connection */
char *server_guid; /**< GUID of server if we are in shared_connections, #NULL if server GUID is unknown or connection is private */
void
_dbus_connection_unlock (DBusConnection *connection)
{
- CONNECTION_UNLOCK (connection);
+ DBusList *expired_messages;
+ DBusList *iter;
+
+ if (TRACE_LOCKS)
+ {
+ _dbus_verbose ("UNLOCK\n");
+ }
+
+ /* If we had messages that expired (fell off the incoming or outgoing
+ * queues) while we were locked, actually release them now */
+ expired_messages = connection->expired_messages;
+ connection->expired_messages = NULL;
+
+ RELEASING_LOCK_CHECK (connection);
+ _dbus_mutex_unlock (connection->mutex);
+
+ for (iter = _dbus_list_pop_first_link (&expired_messages);
+ iter != NULL;
+ iter = _dbus_list_pop_first_link (&expired_messages))
+ {
+ DBusMessage *message = iter->data;
+
+ dbus_message_unref (message);
+ _dbus_list_free_link (iter);
+ }
}
/**
* @param message the message that was sent.
*/
void
-_dbus_connection_message_sent (DBusConnection *connection,
- DBusMessage *message)
+_dbus_connection_message_sent_unlocked (DBusConnection *connection,
+ DBusMessage *message)
{
DBusList *link;
_dbus_assert (link != NULL);
_dbus_assert (link->data == message);
- /* Save this link in the link cache */
_dbus_list_unlink (&connection->outgoing_messages,
link);
- _dbus_list_prepend_link (&connection->link_cache, link);
-
+ _dbus_list_prepend_link (&connection->expired_messages, link);
+
connection->n_outgoing -= 1;
_dbus_verbose ("Message %p (%s %s %s %s '%s') removed from outgoing queue %p, %d left to send\n",
dbus_message_get_signature (message),
connection, connection->n_outgoing);
- /* Save this link in the link cache also */
- _dbus_message_remove_counter (message, connection->outgoing_counter,
- &link);
- _dbus_list_prepend_link (&connection->link_cache, link);
-
- dbus_message_unref (message);
+ /* It's OK that in principle we call the notify function, because for the
+ * outgoing limit, there isn't one */
+ _dbus_message_remove_counter (message, connection->outgoing_counter);
+
+ /* The message will actually be unreffed when we unlock */
}
/** Function to be called in protected_change_watch() with refcount held */
if (preallocated == NULL)
return NULL;
- if (connection->link_cache != NULL)
- {
- preallocated->queue_link =
- _dbus_list_pop_first_link (&connection->link_cache);
- preallocated->queue_link->data = NULL;
- }
- else
- {
- preallocated->queue_link = _dbus_list_alloc_link (NULL);
- if (preallocated->queue_link == NULL)
- goto failed_0;
- }
-
- if (connection->link_cache != NULL)
- {
- preallocated->counter_link =
- _dbus_list_pop_first_link (&connection->link_cache);
- preallocated->counter_link->data = connection->outgoing_counter;
- }
- else
- {
- preallocated->counter_link = _dbus_list_alloc_link (connection->outgoing_counter);
- if (preallocated->counter_link == NULL)
- goto failed_1;
- }
+ preallocated->queue_link = _dbus_list_alloc_link (NULL);
+ if (preallocated->queue_link == NULL)
+ goto failed_0;
+
+ preallocated->counter_link = _dbus_list_alloc_link (connection->outgoing_counter);
+ if (preallocated->counter_link == NULL)
+ goto failed_1;
_dbus_counter_ref (preallocated->counter_link->data);
_dbus_list_prepend_link (&connection->outgoing_messages,
preallocated->queue_link);
+ /* It's OK that we'll never call the notify function, because for the
+ * outgoing limit, there isn't one */
_dbus_message_add_counter_link (message,
preallocated->counter_link);
DBusMessage *message = element;
DBusConnection *connection = data;
- _dbus_message_remove_counter (message,
- connection->outgoing_counter,
- NULL);
+ _dbus_message_remove_counter (message, connection->outgoing_counter);
dbus_message_unref (message);
}
_dbus_list_free_link (connection->disconnect_message_link);
}
- _dbus_list_clear (&connection->link_cache);
-
_dbus_condvar_free_at_location (&connection->dispatch_cond);
_dbus_condvar_free_at_location (&connection->io_path_cond);
while ((link = _dbus_list_get_last_link (&connection->outgoing_messages)))
{
- _dbus_connection_message_sent (connection, link->data);
+ _dbus_connection_message_sent_unlocked (connection, link->data);
}
}
}
_dbus_connection_peer_filter_unlocked_no_update (DBusConnection *connection,
DBusMessage *message)
{
+ dbus_bool_t sent = FALSE;
+ DBusMessage *ret = NULL;
+ DBusList *expire_link;
+
if (connection->route_peer_messages && dbus_message_get_destination (message) != NULL)
{
/* This means we're letting the bus route this message */
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
- else if (dbus_message_is_method_call (message,
- DBUS_INTERFACE_PEER,
- "Ping"))
+
+ if (!dbus_message_has_interface (message, DBUS_INTERFACE_PEER))
+ {
+ return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+ }
+
+ /* Preallocate a linked-list link, so that if we need to dispose of a
+ * message, we can attach it to the expired list */
+ expire_link = _dbus_list_alloc_link (NULL);
+
+ if (!expire_link)
+ return DBUS_HANDLER_RESULT_NEED_MEMORY;
+
+ if (dbus_message_is_method_call (message,
+ DBUS_INTERFACE_PEER,
+ "Ping"))
{
- DBusMessage *ret;
- dbus_bool_t sent;
-
ret = dbus_message_new_method_return (message);
if (ret == NULL)
- return DBUS_HANDLER_RESULT_NEED_MEMORY;
-
- sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
-
- dbus_message_unref (ret);
+ goto out;
- if (!sent)
- return DBUS_HANDLER_RESULT_NEED_MEMORY;
-
- return DBUS_HANDLER_RESULT_HANDLED;
+ sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
}
else if (dbus_message_is_method_call (message,
DBUS_INTERFACE_PEER,
"GetMachineId"))
{
- DBusMessage *ret;
- dbus_bool_t sent;
DBusString uuid;
ret = dbus_message_new_method_return (message);
if (ret == NULL)
- return DBUS_HANDLER_RESULT_NEED_MEMORY;
+ goto out;
- sent = FALSE;
_dbus_string_init (&uuid);
if (_dbus_get_local_machine_uuid_encoded (&uuid))
{
}
}
_dbus_string_free (&uuid);
-
- dbus_message_unref (ret);
-
- if (!sent)
- return DBUS_HANDLER_RESULT_NEED_MEMORY;
-
- return DBUS_HANDLER_RESULT_HANDLED;
}
- else if (dbus_message_has_interface (message, DBUS_INTERFACE_PEER))
+ else
{
/* We need to bounce anything else with this interface, otherwise apps
* could start extending the interface and when we added extensions
* here to DBusConnection we'd break those apps.
*/
-
- DBusMessage *ret;
- dbus_bool_t sent;
-
ret = dbus_message_new_error (message,
DBUS_ERROR_UNKNOWN_METHOD,
"Unknown method invoked on org.freedesktop.DBus.Peer interface");
if (ret == NULL)
- return DBUS_HANDLER_RESULT_NEED_MEMORY;
-
+ goto out;
+
sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
-
- dbus_message_unref (ret);
-
- if (!sent)
- return DBUS_HANDLER_RESULT_NEED_MEMORY;
-
- return DBUS_HANDLER_RESULT_HANDLED;
+ }
+
+out:
+ if (ret == NULL)
+ {
+ _dbus_list_free_link (expire_link);
}
else
{
- return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+ /* It'll be safe to unref the reply when we unlock */
+ expire_link->data = ret;
+ _dbus_list_prepend_link (&connection->expired_messages, expire_link);
}
+
+ if (!sent)
+ return DBUS_HANDLER_RESULT_NEED_MEMORY;
+
+ return DBUS_HANDLER_RESULT_HANDLED;
}
/**
DBusMessage *reply;
DBusString str;
DBusPreallocatedSend *preallocated;
+ DBusList *expire_link;
_dbus_verbose (" sending error %s\n",
DBUS_ERROR_UNKNOWN_METHOD);
-
+
if (!_dbus_string_init (&str))
{
result = DBUS_HANDLER_RESULT_NEED_MEMORY;
_dbus_verbose ("no memory for error reply in dispatch\n");
goto out;
}
-
+
+ expire_link = _dbus_list_alloc_link (reply);
+
+ if (expire_link == NULL)
+ {
+ dbus_message_unref (reply);
+ result = DBUS_HANDLER_RESULT_NEED_MEMORY;
+ _dbus_verbose ("no memory for error send in dispatch\n");
+ goto out;
+ }
+
preallocated = _dbus_connection_preallocate_send_unlocked (connection);
if (preallocated == NULL)
{
+ _dbus_list_free_link (expire_link);
+ /* It's OK that this is finalized, because it hasn't been seen by
+ * anything that could attach user callbacks */
dbus_message_unref (reply);
result = DBUS_HANDLER_RESULT_NEED_MEMORY;
_dbus_verbose ("no memory for error send in dispatch\n");
_dbus_connection_send_preallocated_unlocked_no_update (connection, preallocated,
reply, NULL);
+ /* reply will be freed when we release the lock */
+ _dbus_list_prepend_link (&connection->expired_messages, expire_link);
- dbus_message_unref (reply);
-
result = DBUS_HANDLER_RESULT_HANDLED;
}
*/
_dbus_connection_putback_message_link_unlocked (connection,
message_link);
+ /* now we don't want to free them */
+ message_link = NULL;
+ message = NULL;
}
else
{
_dbus_verbose (" ... done dispatching\n");
-
- _dbus_list_free_link (message_link);
- dbus_message_unref (message); /* don't want the message to count in max message limits
- * in computing dispatch status below
- */
}
-
+
_dbus_connection_release_dispatch (connection);
HAVE_LOCK_CHECK (connection);
+ if (message != NULL)
+ {
+ /* We don't want this message to count in maximum message limits when
+ * computing the dispatch status, below. We have to drop the lock
+ * temporarily, because finalizing a message can trigger callbacks.
+ *
+ * We have a reference to the connection, and we don't use any cached
+ * pointers to the connection's internals below this point, so it should
+ * be safe to drop the lock and take it back. */
+ CONNECTION_UNLOCK (connection);
+ dbus_message_unref (message);
+ CONNECTION_LOCK (connection);
+ }
+
+ if (message_link != NULL)
+ _dbus_list_free_link (message_link);
+
_dbus_verbose ("before final status update\n");
status = _dbus_connection_get_dispatch_status_unlocked (connection);
dbus_uint32_t *out_bytes,
dbus_uint32_t *out_fds,
dbus_uint32_t *out_peak_bytes,
- dbus_uint32_t *out_peak_fds,
- dbus_uint32_t *link_cache_size)
+ dbus_uint32_t *out_peak_fds)
{
CONNECTION_LOCK (connection);
if (out_peak_fds != NULL)
*out_peak_fds = _dbus_counter_get_peak_unix_fd_value (connection->outgoing_counter);
- if (link_cache_size != NULL)
- {
- *link_cache_size = _dbus_list_get_length (&connection->link_cache) * sizeof (DBusList);
- }
-
CONNECTION_UNLOCK (connection);
}
#endif /* DBUS_ENABLE_STATS */
projects / platform / upstream / dbus.git / blobdiff