Hi Jim,
Jim Bell wrote:
On 2020-11-21 5:59 AM, Jim Bell wrote:
The standard python asyncio tests hang.
cd /usr/lib/python3.8/test
python3.8 test_asyncore.py -v
[...]
Using strace, stripping down this very repeatable test, and grabbing the
source-code snapshot, it looks like winsup/cygwin/select.cc socket_cleanup() is
waiting forever for the thread to go away.
strace:
121 6732185 [main] python3.8 13329 select_stuff::cleanup: calling cleanup
rout
ines
178 6732363 [main] python3.8 13329 socket_cleanup: si 0x800290E10 si->thread 0
x18023E758
-
But I don't see the select_printf("returning") at select.cc:1808, so the
si->thread->detach() call seems to be blocked forever. I don't see that we make
it here either:
select.cc:1685 select_printf ("leaving thread_socket");
I see a bool stop_thread field in select_info, inherited by select_socket_info
(select.h), used by other mechanisms. Seems that could be set by socket_cleanup()
and used by thread_socket() to break out of its event loops (select.cc lines 1660
and 1667)
https://cygwin.com/git/?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/select.cc;hb=HEAD#l1796
Thanks for the report and especially for the initial debugging you've done. I've
reproduced the issue on my test machine. No need to supply 'cygcheck -svr' at
this point. I'll investigate this further and keep you posted (on the Cygwin
mailing list).
..mark
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