New submission from Lev Veshnyakov:
It's only in imap, in map it's ok. The following code explains the issue:
from multiprocessing.pool import ThreadPool
pool = ThreadPool(10)
def gen():
yield 1 + '1' # here is an error
try:
next((pool.imap(str, gen())))
except:
# Will be catched using pool.map normally, but using pool.imap will be not.
# Instead it hangs. This is the same for ThreadPool and Pool.
print('this will not be printed because thread is hanging')
----------
components: Library (Lib)
files: test.py
messages: 280833
nosy: lev-veshnyakov
priority: normal
severity: normal
status: open
title: imap from ThreadPool hangs by an exception in a generator function
type: behavior
versions: Python 3.4, Python 3.5
Added file: http://bugs.python.org/file45486/test.py
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<http://bugs.python.org/issue28696>
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