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ssm: Remove delayed action GCancellable integration

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Unfortunately, the implementation was not thread safe and was not
sticking to the thread local main context.

In addition to this, it is not entirely clear to me how this API should
behave. The current approach is to simply cancel the transition with the
state machine halting in its current state. Instead, it could also make
sense for cancellation to cause the state machine to return a
G_IO_ERROR_CANCELLED.

As such, simply remove the feature for now. If anyone actually has a
good use-case then we can add it again.
This commit is contained in:
Benjamin Berg
2021-04-22 18:09:14 +02:00
parent 94e86875ae
commit d683b271d4
11 changed files with 57 additions and 243 deletions
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89
libfprint/fpi-ssm.c
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@@ -82,8 +82,6 @@ struct _FpiSsm
int cur_state;
gboolean completed;
GSource *timeout;
GCancellable *cancellable;
gulong cancellable_id;
GError *error;
FpiSsmCompletedCallback callback;
FpiSsmHandlerCallback handler;
@@ -201,59 +199,13 @@ fpi_ssm_clear_delayed_action (FpiSsm *machine)
{
g_return_if_fail (machine);
if (machine->cancellable_id)
{
g_cancellable_disconnect (machine->cancellable, machine->cancellable_id);
machine->cancellable_id = 0;
}
g_clear_object (&machine->cancellable);
g_clear_pointer (&machine->timeout, g_source_destroy);
}
typedef struct _CancelledActionIdleData
{
gulong cancellable_id;
GCancellable *cancellable;
} CancelledActionIdleData;
static gboolean
on_delayed_action_cancelled_idle (gpointer user_data)
{
CancelledActionIdleData *data = user_data;
g_cancellable_disconnect (data->cancellable, data->cancellable_id);
g_object_unref (data->cancellable);
g_free (data);
return G_SOURCE_REMOVE;
}
static void
on_delayed_action_cancelled (GCancellable *cancellable,
FpiSsm *machine)
{
CancelledActionIdleData *data;
fp_dbg ("[%s] %s cancelled delayed state change",
fp_device_get_driver (machine->dev), machine->name);
g_clear_pointer (&machine->timeout, g_source_destroy);
data = g_new0 (CancelledActionIdleData, 1);
data->cancellable = g_steal_pointer (&machine->cancellable);
data->cancellable_id = machine->cancellable_id;
machine->cancellable_id = 0;
g_idle_add_full (G_PRIORITY_HIGH_IDLE, on_delayed_action_cancelled_idle,
data, NULL);
}
static void
fpi_ssm_set_delayed_action_timeout (FpiSsm *machine,
int delay,
FpTimeoutFunc callback,
GCancellable *cancellable,
gpointer user_data,
GDestroyNotify destroy_func)
{
@@ -264,16 +216,6 @@ fpi_ssm_set_delayed_action_timeout (FpiSsm *machine,
fpi_ssm_clear_delayed_action (machine);
if (cancellable != NULL)
{
g_set_object (&machine->cancellable, cancellable);
machine->cancellable_id =
g_cancellable_connect (machine->cancellable,
G_CALLBACK (on_delayed_action_cancelled),
machine, NULL);
}
machine->timeout = fpi_device_add_timeout (machine->dev, delay, callback,
user_data, destroy_func);
}
@@ -439,24 +381,21 @@ on_device_timeout_complete (FpDevice *dev,
* fpi_ssm_mark_completed_delayed:
* @machine: an #FpiSsm state machine
* @delay: the milliseconds to wait before switching to the next state
* @cancellable: (nullable): a #GCancellable to cancel the delayed operation
*
* Mark a ssm as completed successfully with a delay of @delay ms.
* The callback set when creating the state machine with fpi_ssm_new () will be
* called when the timeout is over.
* The request can be cancelled passing a #GCancellable as @cancellable.
*/
void
fpi_ssm_mark_completed_delayed (FpiSsm *machine,
int delay,
GCancellable *cancellable)
fpi_ssm_mark_completed_delayed (FpiSsm *machine,
int delay)
{
g_autofree char *source_name = NULL;
g_return_if_fail (machine != NULL);
fpi_ssm_set_delayed_action_timeout (machine, delay,
on_device_timeout_complete, cancellable,
on_device_timeout_complete,
machine, NULL);
source_name = g_strdup_printf ("[%s] ssm %s complete %d",
@@ -551,25 +490,21 @@ on_device_timeout_next_state (FpDevice *dev,
* fpi_ssm_next_state_delayed:
* @machine: an #FpiSsm state machine
* @delay: the milliseconds to wait before switching to the next state
* @cancellable: (nullable): a #GCancellable to cancel the delayed operation
*
* Iterate to next state of a state machine with a delay of @delay ms. If the
* current state is the last state, then the state machine will be marked as
* completed, as if calling fpi_ssm_mark_completed().
* Passing a valid #GCancellable will cause the action to be cancelled when
* @cancellable is.
*/
void
fpi_ssm_next_state_delayed (FpiSsm *machine,
int delay,
GCancellable *cancellable)
fpi_ssm_next_state_delayed (FpiSsm *machine,
int delay)
{
g_autofree char *source_name = NULL;
g_return_if_fail (machine != NULL);
fpi_ssm_set_delayed_action_timeout (machine, delay,
on_device_timeout_next_state, cancellable,
on_device_timeout_next_state,
machine, NULL);
source_name = g_strdup_printf ("[%s] ssm %s jump to next state %d",
@@ -626,18 +561,14 @@ on_device_timeout_jump_to_state (FpDevice *dev,
* @machine: an #FpiSsm state machine
* @state: the state to jump to
* @delay: the milliseconds to wait before switching to @state state
* @cancellable: (nullable): a #GCancellable to cancel the delayed operation
*
* Jump to the @state state with a delay of @delay milliseconds, bypassing
* intermediary states.
* Passing a valid #GCancellable will cause the action to be cancelled when
* @cancellable is.
*/
void
fpi_ssm_jump_to_state_delayed (FpiSsm *machine,
int state,
int delay,
GCancellable *cancellable)
fpi_ssm_jump_to_state_delayed (FpiSsm *machine,
int state,
int delay)
{
FpiSsmJumpToStateDelayedData *data;
g_autofree char *source_name = NULL;
@@ -651,7 +582,7 @@ fpi_ssm_jump_to_state_delayed (FpiSsm *machine,
fpi_ssm_set_delayed_action_timeout (machine, delay,
on_device_timeout_jump_to_state,
cancellable, data, g_free);
data, g_free);
source_name = g_strdup_printf ("[%s] ssm %s jump to state %d",
fp_device_get_device_id (machine->dev),