Not working in macOSX

[rudaoshi]

trafficstars

cannot pass the test on macOSX 11.2.2

reporting: AttributeError: Can't pickle local object 'WhenMultipleProcessesLogRecords.test_then_records_should_not_be_garbled..worker'

[jruere]

I have no idea what's that error. Only Linux is supported.

[andrewdotcallahan]

Personally, I was able to get this working on OSX by changing the default multiprocessing behavior from spawn (OSX default as of Python 3.8 I think) to fork (Linux default). You can read more about it here.

The magic snippet is to make the first line of your program:

   multiprocessing.set_start_method('fork')  # Update default for OSX.

[andrewdotcallahan]

Do note that the linked python docs state:

Changed in version 3.8: On macOS, the spawn start method is now the default. The fork start method should be considered unsafe as it can lead to crashes of the subprocess. See bpo-33725

So, change the method at your own risk.

[jruere]

This approach seems problematic. Why not use the QueueHandler and corresponding listener directly?

[jruere]

The OS is not supported. The approach of this module only work with "fork".