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A possibility to deadlock (on the hidden import lock) was created here
in 2.3, seemingly when tempfile.py started to call functions in
random.py. The cure is "the usual": don't spawn threads as a side
effect of importing, when the spawned threads themselves do imports
(directly or indirectly), and the code that spawned the threads is
waiting for the threads to finish (they can't finish, because they're
waiting for the import lock the spawner still holds). Worming around
this is why the "test_main" mechanism was introduced in regrest, so
it's a straightforward fix.
NOT a bugfix candidate; the problem was introduced in 2.3.
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imports e.g. test_support must do so using an absolute package name
such as "import test.test_support" or "from test import test_support".
This also updates the README in Lib/test, and gets rid of the
duplicate data dirctory in Lib/test/data (replaced by
Lib/email/test/data).
Now Tim and Jack can have at it. :)
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failing later when Python is compiled without threading but a failing
'threading' module can be imported due to an earlier (caught) attempt.
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pid across threads (but in that case, it's still the same process, and so
still sharing the "template" cache in tempfile.py). Repaired that, and
added a new std test.
On Linux, someone please run that standalone with more files and/or more
threads; e.g.,
python lib/test/test_threadedtempfile.py -f 1000 -t 10
to run with 10 threads each creating (and deleting) 1000 temp files.
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