Message397246
The behaviour of select.poll() is inconsistent across MacOS versions, on MacOS Mojave (10.14.6) registering and polling the receiving channel of mp.Pipe(duplex=False) returns the event POLLOUT (ready to write to). This is verified by a colleagues setup.
Whereas on MacOS 11 the same scenario will not have poll() return that the receiving channel is ready for writing to (POLLOUT).
Example:
###
import select
import multiprocessing as mp
recv_end, send_end = mp.Pipe(duplex=False)
poll = select.poll()
poll.register(recv_end)
print(poll.poll(1000))
###
MacOS 10.14.6 Result:
> [(3,4)]
MacOS 11.0.1 Result:
> []
I am assuming that the MacOS 11 behaviour is should be the expected behaviour, and that the recv connection from a Pipe should never return that it is writable.
This was tested with Python 3.9.4, and 3.7.6. |
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Date |
User |
Action |
Args |
2021-07-10 11:02:27 | samh42 | set | recipients:
+ samh42, ronaldoussoren, ned.deily |
2021-07-10 11:02:27 | samh42 | set | messageid: <1625914947.01.0.465830160545.issue44597@roundup.psfhosted.org> |
2021-07-10 11:02:26 | samh42 | link | issue44597 messages |
2021-07-10 11:02:26 | samh42 | create | |
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