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Description
When I call a native C++ method with an asynchronous JS call outside of the main method, an incorrect result is returned (I expect HTTP status 200). Does anyone know what I'm doing wrong?
Chrome console output (without main function, with call from JS)
ASYNCIFY: handleSleep 0
ASYNCIFY: start unwind 5246952
ASYNCIFY: stop unwind
js_func: 0
ASYNCIFY: start rewind 5246952
ASYNCIFY: start: ƒ (){Asyncify.exportCallStack.push(x);try{return original.apply(null,arguments)}finally{if(ABORT)return;var y=Asyncify.exportCallStack.pop();assert(y===x);Asyncify.maybeStopUnwind()}}
ASYNCIFY: handleSleep 2
stop rewind
Chrome console output (with main function, without call from JS)
ASYNCIFY: handleSleep 0
ASYNCIFY: start unwind 5249000
ASYNCIFY: stop unwind
ASYNCIFY: start rewind 5249000
ASYNCIFY: start: ƒ (){Asyncify.exportCallStack.push(x);try{return original.apply(null,arguments)}finally{if(ABORT)return;var y=Asyncify.exportCallStack.pop();assert(y===x);Asyncify.maybeStopUnwind()}}
ASYNCIFY: handleSleep 2
ASYNCIFY: stop rewind
cpp_func: 200
func.cpp
#include <emscripten/val.h>
#include <emscripten/bind.h>
int func() {
return emscripten::val::global().call<emscripten::val>("fetch", std::string("index.html")).await()["status"].as<int>();
}
//int main() {
// printf("cpp_func: %d\n", func());
// return 0;
//}
EMSCRIPTEN_BINDINGS(Func) {
emscripten::function("func", &func);
}index.html
<!doctype html>
<html>
<script>
var Module = {
onRuntimeInitialized: function() {
console.log("js_func: " + Module.func());
}
};
</script>
<script src="func.js"></script>
</html>CMakeLists.txt
cmake_minimum_required(VERSION 3.10)
project(Func)
set(CMAKE_CXX_STANDARD 11)
add_library(Func STATIC
func.cpp
)compile.sh
emcmake cmake -B build
cd build
emmake make
emcc -O3 --bind -s ASYNCIFY -s ASYNCIFY_DEBUG -o ../func.js -Wl,--whole-archive libFunc.a
cd ..serve.sh
python3 -m http.server