JS Threads

not_thread_safe.js

var foo_count = 0;
var bar_count = 0;
var foo = function() {
    ++foo_count;
    window.setTimeout(bar, 5);
};

var bar = function() {
    ++bar_count;
    alert("foo="+foo_count+", bar="+bar_count);
};

// triggers
window.setTimeout(foo, 10);
window.setTimeout(bar, 20);
// end triggers

pseudo_code

sub process
    lock = get lock
    if not lock owner
        retry sub process in N ms (sleep)
        return
    lock was obtained
    perform critical code
    release lock
    non critical segment here
end process