Feature request: MAIN_THREAD_EM_ASYNC_JS · emscripten-core/emscripten#16694

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good first bughelp wanted

描述

EM_ASYNC_JS is really useful for writing async JS code with await, however it runs on the thread it was called on. It would be nice if there were a version that proxied the call to the main thread.

The alternative is to use MAIN_THREAD_ASYNC_EM_ASM (extra boilerplate with Asyncify.handleAsync and doesn't define a C function like EM_ASYNC_JS does):

MAIN_THREAD_ASYNC_EM_ASM({
    return Asyncify.handleAsync(async () => {
        // ....
    });
});

and then setting -s 'ASYNCIFY_IMPORTS=["emscripten_receive_on_main_thread_js"]'

貢獻者指南

技術棧: javascriptccppwasm
領域: toolingdeveloper experience
議題類型: feature
難度: 4
預計時間: over 1 week
活動狀態: stale
清晰度: clear
前置要求: Emscripten build systemAsyncify APIWebAssembly threadingJavaScript async/await
新手友善度: 15
研究方向: Understand the current EM ASYNC JS implementation, likely in src/emscripten settings.js or src/asyncify.js. Examine how MAIN THREAD ASYNC EM ASM uses Asyncify.handleAsync. Review the linked issue #8991 and comment for prior discussion. Propose a new macro that combines the EM ASYNC JS syntax with main thread proxying, possibly by leveraging the existing `emscripten receive on main thread js` import.