Schedules the I/O job to run.
notify will be called on user_data after job_func has returned,
regardless whether the job was cancelled or has run to completion.
If cancellable is not NULL, it can be used to cancel the I/O job
by calling g_cancellable_cancel() or by calling
g_io_scheduler_cancel_all_jobs().
Schedules the I/O job to run. notify will be called on user_data after job_func has returned, regardless whether the job was cancelled or has run to completion. If cancellable is not NULL, it can be used to cancel the I/O job by calling g_cancellable_cancel() or by calling g_io_scheduler_cancel_all_jobs().