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Merge branch 'fix-cancellable-connect-race' into 'main'

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GCancellable: Ensure it is always cancelled on connect callback

See merge request GNOME/glib!2764
This commit is contained in:
Philip Withnall 2022-12-16 18:11:03 +00:00
commit a8826215b0
2 changed files with 92 additions and 6 deletions
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35
gio/gcancellable.c
View File

@ -50,6 +50,8 @@ struct _GCancellablePrivate
/* Access to fields below is protected by cancellable_mutex. */
guint cancelled_running : 1;
guint cancelled_running_waiting : 1;
unsigned cancelled_emissions;
unsigned cancelled_emissions_waiting : 1;
guint fd_refcount;
GWakeup *wakeup;
@ -267,9 +269,14 @@ g_cancellable_reset (GCancellable *cancellable)
priv = cancellable->priv;
while (priv->cancelled_running)
while (priv->cancelled_running || priv->cancelled_emissions > 0)
{
priv->cancelled_running_waiting = TRUE;
if (priv->cancelled_running)
priv->cancelled_running_waiting = TRUE;
if (priv->cancelled_emissions > 0)
priv->cancelled_emissions_waiting = TRUE;
g_cond_wait (&cancellable_cond, &cancellable_mutex);
}
@ -571,15 +578,26 @@ g_cancellable_connect (GCancellable *cancellable,
void (*_callback) (GCancellable *cancellable,
gpointer user_data);
g_mutex_unlock (&cancellable_mutex);
_callback = (void *)callback;
id = 0;
cancellable->priv->cancelled_emissions++;
g_mutex_unlock (&cancellable_mutex);
_callback (cancellable, data);
if (data_destroy_func)
data_destroy_func (data);
g_mutex_lock (&cancellable_mutex);
if (cancellable->priv->cancelled_emissions_waiting)
g_cond_broadcast (&cancellable_cond);
cancellable->priv->cancelled_emissions--;
g_mutex_unlock (&cancellable_mutex);
}
else
{
@ -630,9 +648,14 @@ g_cancellable_disconnect (GCancellable *cancellable,
priv = cancellable->priv;
while (priv->cancelled_running)
while (priv->cancelled_running || priv->cancelled_emissions)
{
priv->cancelled_running_waiting = TRUE;
if (priv->cancelled_running)
priv->cancelled_running_waiting = TRUE;
if (priv->cancelled_emissions)
priv->cancelled_emissions_waiting = TRUE;
g_cond_wait (&cancellable_cond, &cancellable_mutex);
}

63
gio/tests/cancellable.c
View File

@ -728,6 +728,68 @@ test_cancellable_cancel_reset_races (void)
g_object_unref (cancellable);
}
static gpointer
repeatedly_connecting_thread (gpointer data)
{
GCancellable *cancellable = data;
const guint iterations = 10000;
gboolean callback_ever_called = FALSE;
for (guint i = 0; i < iterations; ++i)
{
gboolean callback_called = FALSE;
gboolean called;
gulong id = g_cancellable_connect (cancellable,
G_CALLBACK (on_racy_cancellable_cancelled),
&callback_called, NULL);
called = g_atomic_int_get (&callback_called);
callback_ever_called |= called;
if (g_test_verbose () && called)
g_test_message ("Reconnecting cancellation callback called");
g_cancellable_disconnect (cancellable, id);
}
if (!callback_ever_called)
g_test_incomplete ("We didn't really checked if callbacks is called properly");
return NULL;
}
static void
test_cancellable_cancel_reset_connect_races (void)
{
GCancellable *cancellable;
GThread *resetting_thread = NULL;
GThread *cancelling_thread = NULL;
GThread *connecting_thread = NULL;
gboolean callback_called = FALSE;
g_test_summary ("Tests threads racing for cancelling, connecting and disconnecting "
" and resetting a GCancellable");
cancellable = g_cancellable_new ();
g_cancellable_connect (cancellable, G_CALLBACK (on_racy_cancellable_cancelled),
&callback_called, NULL);
g_assert_false (callback_called);
resetting_thread = g_thread_new ("/cancel-reset-connect-races/resetting",
repeatedly_resetting_thread,
cancellable);
cancelling_thread = g_thread_new ("/cancel-reset-connect-races/cancelling",
repeatedly_cancelling_thread, cancellable);
connecting_thread = g_thread_new ("/cancel-reset-connect-races/connecting",
repeatedly_connecting_thread, cancellable);
g_thread_join (g_steal_pointer (&cancelling_thread));
g_thread_join (g_steal_pointer (&resetting_thread));
g_thread_join (g_steal_pointer (&connecting_thread));
g_assert_true (callback_called);
g_object_unref (cancellable);
}
int
main (int argc, char *argv[])
{
@ -741,6 +803,7 @@ main (int argc, char *argv[])
g_test_add_func ("/cancellable/poll-fd-cancelled", test_cancellable_cancelled_poll_fd);
g_test_add_func ("/cancellable/poll-fd-cancelled-threaded", test_cancellable_cancelled_poll_fd_threaded);
g_test_add_func ("/cancellable/cancel-reset-races", test_cancellable_cancel_reset_races);
g_test_add_func ("/cancellable/cancel-reset-connect-races", test_cancellable_cancel_reset_connect_races);
g_test_add_func ("/cancellable-source/threaded-dispose", test_cancellable_source_threaded_dispose);
return g_test_run ();