On Mon, Mar 9, 2020 at 11:18 PM Kyle Stanley <aeros...@gmail.com> wrote:
> We're currently looking into adjusting the current Executor implementation > (for both TPE and PPE) to not use daemon threads at all for subinterpreter > compatibility, see https://bugs.python.org/issue39812. Instead of using > an atexit handler, there's some consideration for using a similar > threading-specific "exit handler". Instead of being upon program exit, > registered functions would be called just before all of the non-daemon > threads are joined in `threading._shutdown()`. > > As a result, I suspect that we are unlikely to implement something like > the above. But, as a convenient side effect, it should somewhat address the > current potentially surprising behavior. > There might still be some fun involved given that current implementation *might* lazy-spawn threads upon submit. This means that if a ThreadExecutor is called from both daemon and non-daemon threads (which is a very bad idea though), the kind of spawned threads might be unpredictable.
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