setjmp/longjmp test

cmd

emcc main.c --js-library main.js -o hello.html -s "EXTRA_EXPORTED_RUNTIME_METHODS=['ccall']"

main.c

#include <stdio.h>
#include <setjmp.h>

void js_timer_start(void);

static jmp_buf mark;

void on_timer_finish() {
    longjmp(mark, -1);
}

int main()
{
    if (setjmp(mark) != 0) {
        printf("hello!\n");
        return 0;
    }
    js_timer_start();
    return 0;
}

main.js

mergeInto(LibraryManager.library, {
    js_timer_start: function() {
        setTimeout(() => {
            Module.ccall('on_timer_finish', 'void', [], []);
        }, 5000);
    },
});