New submission from STINNER Victor:
multiprocess, telnetlib (and subprocess in a near future, see #18923) use the
following code to select the best selector:
# poll/select have the advantage of not requiring any extra file descriptor,
# contrarily to epoll/kqueue (also, they require a single syscall).
if hasattr(selectors, 'PollSelector'):
_TelnetSelector = selectors.PollSelector
else:
_TelnetSelector = selectors.SelectSelector
I don't like the principle of "a default selector", selectors.DefaultSelector
should be removed in my opinion.
I would prefer a function returning the best selector using constraints.
Example:
def get_selector(use_fd=True) -> BaseSelector:
...
By default, it would return the same than the current DefaultSelector. But if
you set use_fd=False, the choice would be restricted to select() or poll().
I don't want to duplicate code like telnetlib uses in each module, it's harder
to maintain. The selectors module may get new selectors in the future, see for
example #18931.
Except use_fd, I don't have other ideas of constraints. I read somewhere that
differenet selectors may have different limits on the number of file
descriptors. I don't know if it's useful to use such constraint?
----------
messages: 201855
nosy: gvanrossum, haypo, neologix
priority: normal
severity: normal
status: open
title: selectors: provide a helper to choose a selector using constraints
versions: Python 3.4
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<http://bugs.python.org/issue19465>
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