How to call a js function from C subThread?

[sleeplatelscn]

I defined a function in js:

function testSomething(){
    console.log("testSomething");
}

Now I need to call it from a C++ subThread thru callback:

void notifyJavaScript(void* arg) {
    emscripten_run_script("testSomething();");
}

void WwiseCallBackFuncCPP(AkCallbackType in_eType, AkCallbackInfo* in_pCallbackInfo)
{
	//EM_ASM(testSomething());   //testSomething not defined，only work in main thread
	//emscripten_run_script("testSomething();");  //testSomething not defined，only work in main thread
	emscripten_async_call(notifyJavaScript, nullptr, 0);  //nothing happened，only work in main thread
       EM_ASM({
        postMessage({ type: 'callJavaScriptFunction' });   //nothing happened，only work in main thread
        });
	std::cout<<"WwiseCallBackFuncCPP"<<std::endl;  //output all right in the console
}

How can I fix this? WwiseCallBackFuncCPP is called by subThread automaticlly.

[sbc100]

Only JS code which is part the emscripten output is available in threads. In you want testSomething to be callable from threads you would need to include it somehow, perhaps via a --pre-js or --post-js file?