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shared: add nm_utils_invoke_on_idle() helper

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This commit is contained in:
Thomas Haller 2018-10-11 18:02:08 +02:00
parent c5c7dc59c5
commit bd21a63e2f
2 changed files with 76 additions and 0 deletions
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67
shared/nm-utils/nm-shared-utils.c
View file

@ -2055,3 +2055,70 @@ _nm_utils_unescape_spaces (char *str)
}
#undef IS_SPACE
/*****************************************************************************/
typedef struct {
gpointer callback_user_data;
GCancellable *cancellable;
NMUtilsInvokeOnIdleCallback callback;
gulong cancelled_id;
guint idle_id;
} InvokeOnIdleData;
static gboolean
_nm_utils_invoke_on_idle_cb_idle (gpointer user_data)
{
InvokeOnIdleData *data = user_data;
data->idle_id = 0;
nm_clear_g_signal_handler (data->cancellable, &data->cancelled_id);
data->callback (data->callback_user_data, data->cancellable);
nm_g_object_unref (data->cancellable);
g_slice_free (InvokeOnIdleData, data);
return G_SOURCE_REMOVE;
}
static void
_nm_utils_invoke_on_idle_cb_cancelled (GCancellable *cancellable,
InvokeOnIdleData *data)
{
/* on cancellation, we invoke the callback synchronously. */
nm_clear_g_signal_handler (data->cancellable, &data->cancelled_id);
nm_clear_g_source (&data->idle_id);
data->callback (data->callback_user_data, data->cancellable);
nm_g_object_unref (data->cancellable);
g_slice_free (InvokeOnIdleData, data);
}
void
nm_utils_invoke_on_idle (NMUtilsInvokeOnIdleCallback callback,
gpointer callback_user_data,
GCancellable *cancellable)
{
InvokeOnIdleData *data;
g_return_if_fail (callback);
data = g_slice_new (InvokeOnIdleData);
data->callback = callback;
data->callback_user_data = callback_user_data;
data->cancellable = nm_g_object_ref (cancellable);
if ( cancellable
&& !g_cancellable_is_cancelled (cancellable)) {
/* if we are passed a non-cancelled cancellable, we register to the "cancelled"
* signal an invoke the callback synchronously (from the signal handler).
*
* We don't do that,
* - if the cancellable is already cancelled (because we don't want to invoke
* the callback synchronously from the caller).
* - if we have no cancellable at hand. */
data->cancelled_id = g_signal_connect (cancellable,
"cancelled",
G_CALLBACK (_nm_utils_invoke_on_idle_cb_cancelled),
data);
} else
data->cancelled_id = 0;
data->idle_id = g_idle_add (_nm_utils_invoke_on_idle_cb_idle, data);
}

9
shared/nm-utils/nm-shared-utils.h
View file

@ -909,4 +909,13 @@ void _nm_utils_user_data_unpack (gpointer user_data, int nargs, ...);
const char *_nm_utils_escape_spaces (const char *str, char **to_free);
char *_nm_utils_unescape_spaces (char *str);
/*****************************************************************************/
typedef void (*NMUtilsInvokeOnIdleCallback) (gpointer callback_user_data,
GCancellable *cancellable);
void nm_utils_invoke_on_idle (NMUtilsInvokeOnIdleCallback callback,
gpointer callback_user_data,
GCancellable *cancellable);
#endif /* __NM_SHARED_UTILS_H__ */