wasip3: Finish nonblocking I/O implementation for TCP#782
Merged
alexcrichton merged 6 commits intoWebAssembly:mainfrom Apr 13, 2026
Merged
wasip3: Finish nonblocking I/O implementation for TCP#782alexcrichton merged 6 commits intoWebAssembly:mainfrom
alexcrichton merged 6 commits intoWebAssembly:mainfrom
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This commit fills out the final bits of nonblocking I/O for TCP sockets. This necessitates an implementation of nonblocking I/O for `stream<u8>` on both the reading and the writing side of things. Additionally things like TCP accepts now work, too. All tests are now passing on the WASIp3 target and the `FAILP3` directive is now removed since it's no longer necessary. The internals of the implementation here are pretty gnarly. This is due to the need to bridge the readiness-based-model of `poll` with the completion-based model of the component model. This implementation contains optimizations for 0-length reads/writes to use those to signal readiness if the host supports that, but this falls back to internally-buffered reads/writes if that is not supported. This should resolve all remaining TODOs for WASIp3 that I know of at least in wasi-libc, so after this it'd be switching to bug-finding mode and handling bug reports as projects are compiled with wasip3.
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cc @badeend, would you be willing to take a look at this? I realize that you may not be the most familiar with this code so it's totally fine if you'd rather not, too. |
dicej
approved these changes
Apr 9, 2026
dicej
reviewed
Apr 9, 2026
Co-authored-by: Joel Dice <joel.dice@akamai.com>
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I'm going to go ahead and merge this @badeend but I'd still value your input if you get a chance in the future to take a look, happy to have follow-ups! |
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This commit fills out the final bits of nonblocking I/O for TCP sockets. This necessitates an implementation of nonblocking I/O for
stream<u8>on both the reading and the writing side of things. Additionally things like TCP accepts now work, too. All tests are now passing on the WASIp3 target and theFAILP3directive is now removed since it's no longer necessary.The internals of the implementation here are pretty gnarly. This is due to the need to bridge the readiness-based-model of
pollwith the completion-based model of the component model. This implementation contains optimizations for 0-length reads/writes to use those to signal readiness if the host supports that, but this falls back to internally-buffered reads/writes if that is not supported.This should resolve all remaining TODOs for WASIp3 that I know of at least in wasi-libc, so after this it'd be switching to bug-finding mode and handling bug reports as projects are compiled with wasip3.