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gh-124621: Emscripten: Add support for async input devices - #136822
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hoodmane
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Jul 19, 2025
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!buildbot emscripten |
bedevere-bot
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Jul 19, 2025
🤖 New build scheduled with the buildbot fleet by @hoodmane for commit 3d573d5 🤖 Results will be shown at: https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F136822%2Fmerge The command will test the builders whose names match following regular expression: The builders matched are:
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This is useful for implementing proper `input()`. It requires the JavaScript engine to support the wasm JSPI spec which is now stage 4. It is supported on Chrome since version 137 and on Firefox and node behind a flag. We override the `__wasi_fd_read()` syscall with our own variant that checks for a readAsync operation. If it has it, we use our own async variant of `fd_read()`, otherwise we use the original `fd_read()`. We also add a variant of `FS.createDevice()` called `FS.createAsyncInputDevice()`. Finally, if JSPI is available, we wrap the `main()` symbol with `WebAssembly.promising()` so that we can stack switch from `fd_read()`. If JSPI is not available, attempting to read from an AsyncInputDevice will raise an `OSError`.
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hoodmane
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Jul 19, 2025
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Oops this caused some test failures. Fix incoming. |
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Jul 19, 2025
…handling Introduced in pythonGH-136822. If the fd is already closed, `SYSCALLS.getStreamFromFD()` throws an error. We need to catch it and discard it. The `__wasi_fd_read_orig()` fallback will use it to set errno.
hoodmane added a commit
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Jul 19, 2025
…handling Introduced in pythonGH-136822. If the fd is already closed, `SYSCALLS.getStreamFromFD()` throws an error. We need to catch it and discard it. The `__wasi_fd_read_orig()` fallback will use it to set errno.
hoodmane added a commit
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Jul 19, 2025
…handling Introduced in pythonGH-136822. If the fd is already closed, `SYSCALLS.getStreamFromFD()` throws an error. We need to catch it and discard it. The `__wasi_fd_read_orig()` fallback will use it to set errno.
hoodmane added a commit
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Jul 19, 2025
…handling Introduced in pythonGH-136822. If the fd is already closed, `SYSCALLS.getStreamFromFD()` throws an error. We need to catch it and discard it. The `__wasi_fd_read_orig()` fallback will use it to set errno.
miss-islington pushed a commit
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Jul 21, 2025
…honGH-136822) This is useful for implementing proper `input()`. It requires the JavaScript engine to support the wasm JSPI spec which is now stage 4. It is supported on Chrome since version 137 and on Firefox and node behind a flag. We override the `__wasi_fd_read()` syscall with our own variant that checks for a readAsync operation. If it has it, we use our own async variant of `fd_read()`, otherwise we use the original `fd_read()`. We also add a variant of `FS.createDevice()` called `FS.createAsyncInputDevice()`. Finally, if JSPI is available, we wrap the `main()` symbol with `WebAssembly.promising()` so that we can stack switch from `fd_read()`. If JSPI is not available, attempting to read from an AsyncInputDevice will raise an `OSError`. (cherry picked from commit 7ae4749) Co-authored-by: Hood Chatham <roberthoodchatham@gmail.com>
GH-136935 is a backport of this pull request to the 3.14 branch. |
ambv pushed a commit
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Jul 22, 2025
…-136822) (GH-136935) This is useful for implementing proper `input()`. It requires the JavaScript engine to support the wasm JSPI spec which is now stage 4. It is supported on Chrome since version 137 and on Firefox and node behind a flag. We override the `__wasi_fd_read()` syscall with our own variant that checks for a readAsync operation. If it has it, we use our own async variant of `fd_read()`, otherwise we use the original `fd_read()`. We also add a variant of `FS.createDevice()` called `FS.createAsyncInputDevice()`. Finally, if JSPI is available, we wrap the `main()` symbol with `WebAssembly.promising()` so that we can stack switch from `fd_read()`. If JSPI is not available, attempting to read from an AsyncInputDevice will raise an `OSError`. (cherry picked from commit 7ae4749) Co-authored-by: Hood Chatham <roberthoodchatham@gmail.com>
taegyunkim pushed a commit
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Aug 4, 2025
…honGH-136822) This is useful for implementing proper `input()`. It requires the JavaScript engine to support the wasm JSPI spec which is now stage 4. It is supported on Chrome since version 137 and on Firefox and node behind a flag. We override the `__wasi_fd_read()` syscall with our own variant that checks for a readAsync operation. If it has it, we use our own async variant of `fd_read()`, otherwise we use the original `fd_read()`. We also add a variant of `FS.createDevice()` called `FS.createAsyncInputDevice()`. Finally, if JSPI is available, we wrap the `main()` symbol with `WebAssembly.promising()` so that we can stack switch from `fd_read()`. If JSPI is not available, attempting to read from an AsyncInputDevice will raise an `OSError`.
Agent-Hellboy pushed a commit
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Aug 19, 2025
…honGH-136822) This is useful for implementing proper `input()`. It requires the JavaScript engine to support the wasm JSPI spec which is now stage 4. It is supported on Chrome since version 137 and on Firefox and node behind a flag. We override the `__wasi_fd_read()` syscall with our own variant that checks for a readAsync operation. If it has it, we use our own async variant of `fd_read()`, otherwise we use the original `fd_read()`. We also add a variant of `FS.createDevice()` called `FS.createAsyncInputDevice()`. Finally, if JSPI is available, we wrap the `main()` symbol with `WebAssembly.promising()` so that we can stack switch from `fd_read()`. If JSPI is not available, attempting to read from an AsyncInputDevice will raise an `OSError`.
kumaraditya303 pushed a commit
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that referenced
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Sep 9, 2025
…es (pythonGH-136822) (pythonGH-136935) This is useful for implementing proper `input()`. It requires the JavaScript engine to support the wasm JSPI spec which is now stage 4. It is supported on Chrome since version 137 and on Firefox and node behind a flag. We override the `__wasi_fd_read()` syscall with our own variant that checks for a readAsync operation. If it has it, we use our own async variant of `fd_read()`, otherwise we use the original `fd_read()`. We also add a variant of `FS.createDevice()` called `FS.createAsyncInputDevice()`. Finally, if JSPI is available, we wrap the `main()` symbol with `WebAssembly.promising()` so that we can stack switch from `fd_read()`. If JSPI is not available, attempting to read from an AsyncInputDevice will raise an `OSError`. (cherry picked from commit 7ae4749) Co-authored-by: Hood Chatham <roberthoodchatham@gmail.com>
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This is useful for implementing proper
input(). It requires the JavaScript engine to support the wasm JSPI spec which is now stage 4. It is supported on Chrome since version 137 and on Firefox and node behind a flag.We override the
__wasi_fd_read()syscall with our own variant that checks for a readAsync operation. If it has it, we use our own async variant offd_read(), otherwise we use the originalfd_read(). We also add a variant ofFS.createDevice()calledFS.createAsyncInputDevice().Finally, if JSPI is available, we wrap the
main()symbol withWebAssembly.promising()so that we can stack switch fromfd_read(). If JSPI is not available, attempting to read from an AsyncInputDevice will raise anOSError.