Switch unix port to common select module, and add POSIX optimisations to that module#12138

Merged

dpgeorge merged 9 commits intomicropython:masterfrom

dpgeorge:unix-use-extmod-select

Aug 7, 2023

Commits on Aug 6, 2023

unix/modsocket: Add poll support for missing ERR,HUP,NVAL poll values.
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extmod/vfs_posix_file: Add poll support for missing ERR,HUP,NVAL values.
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Commits on Aug 7, 2023

unix/modselect: Remove unix-specific implementation of select module.
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extmod/modselect: Abstract out a poll_set_t struct and functions.
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extmod/modselect: Factor low-level polling code into common function.
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extmod/modselect: Add optimisation to use system poll when possible.
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extmod/modselect: Remove undocumented support for flags arg to poll.
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tests/extmod: Add coverage tests for select module.
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tests/extmod: Skip select/socket tests if they can't create UDP socket.
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