data sharing

[zhiqiang ren]

   How can multiple threads access the same wasm data source? For example, the main thread writes data (module.fs.readfile ('File ',' footer ')). I want to access it through the new wasm instance in the worker thread, module1 FS. readFile('file')。

I've seen the proxy mechanism, but it can only be in the same thread, with different new wasm instances

module2. FS. mkdir("/fs1");
module2. FS. mount(module2.PROXYFS, {
root: "/",
fs: module1. FS
}, "/fs1");

[Sam Clegg]

While the native filesystem API (fopen/fclose/fread) etc works from any thread, JS filesystem API (at least the current one, not the new wasmfs one) is designed to run only the main thread.     The native calls are automatically proxied back to the main thread where they execute the JS APIs.   If you are making direct calls to the JS API you need to do it from the main thread.

You can see how/why the syscalls get proxied back to the main thread here:

https://github.com/emscripten-core/emscripten/blob/86640bc46ce5aad96e86d941cdb81d5db984db7f/src/library_syscall.js#L1172-L1185

cheers,

sam

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