threading

[Roy Smith]

In article <mailman.8969.1396839923.18130.python-list at python.org>,
 Ben Finney <ben+python at benfinney.id.au> wrote:

> The *whole point* of threading (AFAIK) is to share memory and other
> process-distinct resources.

There is (or at least, was) another reason.  Creating a new process used 
to be far more expensive than creating a new thread.  In modern  Unix 
kernels, however, the cost difference has become much less, so this is 
no longer a major issue.

I agree wholeheartedly with Ben when he says:

> Parallel processing is achieved much more reliably and deterministically
> with separate processes.

Threading makes it incredibly difficult to reason about program 
execution.  It's not just that things happen asynchronously, the control 
flow changes happen at arbitrary times.