New submission from STINNER Victor:
On old FreeBSD versions, concurrent.futures cannot be used. I don't remember
why, it's probably related to semaphores (something like a low hardcoded
limit). See for example first lines of Lib/test/test_concurrent_futures.py:
---
# Skip tests if _multiprocessing wasn't built.
test.support.import_module('_multiprocessing')
# Skip tests if sem_open implementation is broken.
test.support.import_module('multiprocessing.synchronize')
# import threading after _multiprocessing to raise a more revelant error
# message: "No module named _multiprocessing". _multiprocessing is not compiled
# without thread support.
test.support.import_module('threading')
---
The problem is that asyncio always try to import concurrent.futures. Example:
http://buildbot.python.org/all/builders/x86%20FreeBSD%206.4%203.x/builds/4213/steps/test/logs/stdio
test test_asyncio crashed -- Traceback (most recent call last):
File "/usr/home/db3l/buildarea/3.x.bolen-freebsd/build/Lib/test/regrtest.py",
line 1276, in runtest_inner
test_runner()
File
"/usr/home/db3l/buildarea/3.x.bolen-freebsd/build/Lib/test/test_asyncio/__init__.py",
line 31, in test_main
run_unittest(suite())
File
"/usr/home/db3l/buildarea/3.x.bolen-freebsd/build/Lib/test/test_asyncio/__init__.py",
line 21, in suite
__import__(mod_name)
File
"/usr/home/db3l/buildarea/3.x.bolen-freebsd/build/Lib/test/test_asyncio/test_base_events.py",
line 11, in <module>
from asyncio import base_events
File
"/usr/home/db3l/buildarea/3.x.bolen-freebsd/build/Lib/asyncio/__init__.py",
line 21, in <module>
from .futures import *
File
"/usr/home/db3l/buildarea/3.x.bolen-freebsd/build/Lib/asyncio/futures.py", line
21, in <module>
Error = concurrent.futures._base.Error
AttributeError: 'module' object has no attribute 'futures'
----------
messages: 203222
nosy: gvanrossum, haypo
priority: normal
severity: normal
status: open
title: asyncio should not depend on concurrent.futures, it is not always
available
versions: Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue19635>
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