Safely cancelling jobs

Hi,

Is there a way to safely cancelling jobs without needing to know if they have started, running or finished? I do multiple simulations in parallel, and many of them are finished around the same time. Some of the results become redundant after processing the others, but calling e.g. `async_res.abort()` on the redundant ones quite often freezes the execution (probably the assertion of the job not being finished passes but in the meanwhile the result arrives). So currently I can't abort them because of the chance of freezing the execution.