Convenience function to connect to the cancelled
signal. Also handles the race condition that may happen
if the cancellable is cancelled right before connecting.
callback is called at most once, either directly at the
time of the connect if cancellable is already cancelled,
or when cancellable is cancelled in some thread.
data_destroy_func will be called when the handler is
disconnected, or immediately if the cancellable is already
cancelled.
Since GLib 2.40, the lock protecting cancellable is not held when
callback is invoked. This lifts a restriction in place for
earlier GLib versions which now makes it easier to write cleanup
code that unconditionally invokes e.g. Cancellable.cancel.
Convenience function to connect to the cancelled signal. Also handles the race condition that may happen if the cancellable is cancelled right before connecting.
callback is called at most once, either directly at the time of the connect if cancellable is already cancelled, or when cancellable is cancelled in some thread.
data_destroy_func will be called when the handler is disconnected, or immediately if the cancellable is already cancelled.
See cancelled for details on how to use this.
Since GLib 2.40, the lock protecting cancellable is not held when callback is invoked. This lifts a restriction in place for earlier GLib versions which now makes it easier to write cleanup code that unconditionally invokes e.g. Cancellable.cancel.