[pypy-issue] [issue1289] multiprocessing Pool + maxtasksperchild + signal = ValueError

[bdk]

bdk <bdkearns at gmail.com> added the comment:

I applied a reduced version in 3b06320cf630 that only resets mainthreadident to at 
least allow signal() after fork from a thread (should fix the example bad.py). 
Leaving this open for discussion about the other ThreadLocal behaviors after fork 
(couldn't replicate these parts of the test on CPython).

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