[issue39763] distutils.spawn should use subprocess (hang in parallel builds on QNX)

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

@Antoine: I can sort of see why you consider the small example a red herring, since it mixes threads and fork. Nevertheless, a simpler version (not using an executor) would probably work just fine? It's the edge cases where the mixture becomes explosive. So I still think there's something that could be improved in ThreadPoolExecutor.

@Elad: Your script contains a bug (there is no definition of 'exec_fn'). But anything that returns or raises from the child process does indeed hang.

Since I can repro this on macOS I do QNX is a red herring here.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39763>
_______________________________________