the GObject that owns this task, or NULL. [allow-none][type GObject]
optional GCancellable object, NULL to ignore. [allow-none]
a GAsyncReadyCallback. [scope async]
user data passed to callback. closure
ConstructionException GTK+ fails to create the object.
Creates a GTask acting on source_object, which will eventually be used to invoke callback in the current thread-default main context. Call this in the "start" method of your asynchronous method, and pass the GTask around throughout the asynchronous operation. You can use g_task_set_task_data() to attach task-specific data to the object, which you can retrieve later via g_task_get_task_data(). By default, if cancellable is cancelled, then the return value of the task will always be G_IO_ERROR_CANCELLED, even if the task had already completed before the cancellation. This allows for simplified handling in cases where cancellation may imply that other objects that the task depends on have been destroyed. If you do not want this behavior, you can use g_task_set_check_cancellable() to change it. Since 2.36