executeSync
@JvmStatic
@JvmOverloads
Enqueues the action, blocking the current thread until completion or cancellation/error.
NOTE: If Action is StartDaemon or RestartDaemon, the EnqueuedJob.ExecutionPolicy allows for handling of cancellation while the action is being executed (normally a non-cancellable state). In the event the cancellation callback returns CancellationException, TorRuntime will check for and cancel itself as soon as possible. If this is undesirable, omit the cancellation callback.
NOTE: This is a blocking call and should be invoked from a background thread.
Parameters
cancellation
optional callback which is invoked after every thread sleep (so, multiple times) in order to trigger job cancellation if a non-null exception value is returned.