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gdbusconnection: Factor out remove_signal_data_if_unused

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No functional change, just removing some nesting. The check for whether
signal_data->subscribers is empty changes from a conditional that tests
whether it is into an early-return if it isn't.

A subsequent commit will add additional conditions that make us consider
a SignalData to be still in use and therefore not eligible to be removed.

Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2024-03-14 19:51:59 +00:00
parent a8187079da
commit d31f0777d1
1 changed files with 48 additions and 35 deletions
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83
gio/gdbusconnection.c
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@ -3661,6 +3661,52 @@ g_dbus_connection_signal_subscribe (GDBusConnection *connection,
/* ---------------------------------------------------------------------------------------------------- */
/*
* Called in any thread.
* Must hold the connection lock when calling this, unless
* connection->finalizing is TRUE.
* May free signal_data, so do not dereference it after this.
*/
static void
remove_signal_data_if_unused (GDBusConnection *connection,
SignalData *signal_data)
{
GPtrArray *signal_data_array;
if (signal_data->subscribers->len != 0)
return;
g_warn_if_fail (g_hash_table_remove (connection->map_rule_to_signal_data, signal_data->rule));
signal_data_array = g_hash_table_lookup (connection->map_sender_unique_name_to_signal_data_array,
signal_data->sender_unique_name);
g_warn_if_fail (signal_data_array != NULL);
g_warn_if_fail (g_ptr_array_remove (signal_data_array, signal_data));
if (signal_data_array->len == 0)
{
g_warn_if_fail (g_hash_table_remove (connection->map_sender_unique_name_to_signal_data_array,
signal_data->sender_unique_name));
}
/* remove the match rule from the bus unless NameLost or NameAcquired (see subscribe()) */
if ((connection->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION) &&
!is_signal_data_for_name_lost_or_acquired (signal_data) &&
!g_dbus_connection_is_closed (connection) &&
!connection->finalizing)
{
/* The check for g_dbus_connection_is_closed() means that
* sending the RemoveMatch message can't fail with
* G_IO_ERROR_CLOSED, because we're holding the lock,
* so on_worker_closed() can't happen between the check we just
* did, and releasing the lock later.
*/
remove_match_rule (connection, signal_data->rule);
}
signal_data_free (signal_data);
}
/* called in any thread */
/* must hold lock when calling this (except if connection->finalizing is TRUE)
* returns the number of removed subscribers */
@ -3669,7 +3715,6 @@ unsubscribe_id_internal (GDBusConnection *connection,
guint subscription_id)
{
SignalData *signal_data;
GPtrArray *signal_data_array;
guint n;
guint n_removed = 0;
@ -3696,40 +3741,8 @@ unsubscribe_id_internal (GDBusConnection *connection,
GUINT_TO_POINTER (subscription_id)));
n_removed++;
g_ptr_array_remove_index_fast (signal_data->subscribers, n);
if (signal_data->subscribers->len == 0)
{
g_warn_if_fail (g_hash_table_remove (connection->map_rule_to_signal_data, signal_data->rule));
signal_data_array = g_hash_table_lookup (connection->map_sender_unique_name_to_signal_data_array,
signal_data->sender_unique_name);
g_warn_if_fail (signal_data_array != NULL);
g_warn_if_fail (g_ptr_array_remove (signal_data_array, signal_data));
if (signal_data_array->len == 0)
{
g_warn_if_fail (g_hash_table_remove (connection->map_sender_unique_name_to_signal_data_array,
signal_data->sender_unique_name));
}
/* remove the match rule from the bus unless NameLost or NameAcquired (see subscribe()) */
if ((connection->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION) &&
!is_signal_data_for_name_lost_or_acquired (signal_data) &&
!g_dbus_connection_is_closed (connection) &&
!connection->finalizing)
{
/* The check for g_dbus_connection_is_closed() means that
* sending the RemoveMatch message can't fail with
* G_IO_ERROR_CLOSED, because we're holding the lock,
* so on_worker_closed() can't happen between the check we just
* did, and releasing the lock later.
*/
remove_match_rule (connection, signal_data->rule);
}
signal_data_free (signal_data);
}
/* May free signal_data */
remove_signal_data_if_unused (connection, signal_data);
goto out;
}