Aaron
what you are stating doesn't make sense. Javascript is known as a single
threaded...


Henrik,

Why are you stuck on JavaScript engines being "single-threaded"? What Aaron
has been saying makes total sense!

Browsers are MORE than a JavaScript engine. They are multi-threaded
environments. When a JavaScript routine requests async I/O, that request
isn't run in the JavaScript engine. The browser dispatches it to a
different thread in the browser. When that I/O thread completes, then the
browser evokes the callback routine (which is run by the JavaScript
engine).

Similarly when a JavaScript routine requests a callback by registering a
SetTimeout() event, that timeout event is handled by one or more other
browser threads, which are separate from the thread running the JavaScript
engine. After the timeout occurs, the thread which is handling the
event-loop evokes the callback routine in the thread which is running the
JavaScript engine.

This thread ...

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