I'm trying to get a value returned from a C++ function, which calls a JS
function declared with EM_JS and wrapped with Asyncify.handlerAsync.
The code below reproduces the issue:
// asyncify_return.cpp
#include <string>
#include <iostream>
#include <emscripten.h>
#include <emscripten/bind.h>
EM_JS(void, bar, (), {
Asyncify.handleAsync(async () => {
const cache = await caches.open('test123');
console.log("BAR");
});
});
int foo()
{
std::cout << "FOO" << std::endl;
bar();
return 42;
}
EMSCRIPTEN_BINDINGS(File)
{
emscripten::function("foo", &foo);
}
Then I built it with:
emcc asyncify_return.cpp -o asyncify_return.html --bind -s ASYNCIFY=1 -s
ASYNCIFY_IMPORTS='["bar"]
Result (executed in Chrome 89.0.4389.82 developer console):
let foo = Module.foo()
FOO
BAR
console.log(foo) // yields 0 instead of 42
I'm wondering why I get 0 instead of 42 here. However, if I comment out
Asyncify.handleAsync in bar(), everything works fine.
My emcc version:
$ emcc --version
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld)
2.0.14 (8dd277d191daee9adfad03e5f0663df2db4b8bb1)
Any help and pointers will be appreciated. Thanks.
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