JavaScript virtual machine with QuickJS running in WASM under Go/JS (opens in new tab)

(github.com)

3 pointsaperturecjs2mo ago2 comments

2 comments

Hi all,

This uses a "reactor" mode I added to quickjs recently which exposes quickjs as a wasi library instead of a traditional main() loop. This allows the host environment to call loop_once() to step once through the JS event loop, and poll_io() to check for I/O. This way, if there's nothing available to do (VM is idle), the Go host environment (or js) can sleep until some I/O arrives. This is a lot more efficient than having Js poll for I/O.

Check it out: https://github.com/aperturerobotics/go-quickjs-wasi-reactor

nnx2mo ago

Really interesting, I’m currently using https://github.com/fastschema/qjs but would love a bit lower-level control like your reactor and Go library provide.

loop_once may have been called run_microtask if I understand the “loop” boundary correctly?

Is there a way to be more granular in execution? Like running a single “basic block” (until a jump) or until next function call?

j / k navigate · click thread line to collapse