single-threaded

rpc.call(mycallback); { //subsequent code block } How does the single threaded async callback work? When will the callback get called? Will the subsequent code block always finish executing before the callback is allowed to run (i.e. will the callback only run once all code has finished?)? #1 javascript is single-thread, but the browser is not, so the js-thread sends the xhr call to the browser to resolve it, and the browser returns the control to it inmediately. #2 when the browser gets the response from the server, it queues the callback into the js thread, so it will be executed when js

Even after reading http://krondo.com/?p=1209 or Does an asynchronous call always create/call a new thread? I am still confused about how to provide asynchronous calls on an inherently single-threaded system. I will explain my understanding so far and point out my doubts. One of the examples I read was describing a TCP server providing asynch processing of requests - a user would call a method e.g. get(Callback c) and the callback would be invoked some time later. Now, my first issue here - we have already two systems, one server and one client. This is not what I mean, cause in fact we have

I've been reading John Resig's "Secrets of a JavaScript Ninja" and it explains that JavaScript is single-threaded. However, I tried testing this and I'm not sure what to take away from here: // executing this in browser (function () { // throw something into event queue setTimeout(function () { alert("This will be called back after 1 second."); }, 1000); // arbitrary loop to take up some time for (var i = 0; i < 10000; i += 1) { console.log(i); } })(); Maybe I'm not understanding exactly what being single-threaded means, but I thought that the setTimeout callback wouldn't execute until all of

JavaScript is a single threaded language and therefore it executes one command at a time. Asynchronous programming is being implemented via Web APIs ( DOM for event handling, XMLHttpRequest for AJAX calls, WindowTimers for setTimeout ) and the Event queue which are managed by the browser. So far, so good! Consider now, the following very simple code: $('#mybox').hide(17000); console.log('Previous command has not yet terminated!'); ... Could someone please explain to me the underlying mechanism of the above? Since .hide() has not yet finished (the animation lasts 17 seconds) and JS engine is

The network lib I'm writing needs to send and receive messages through a TCP socket. Messages can be sent or received any time, i.e should work as a full duplex channel. I was able to implement such scenario using two threads: main thread calling send() and a dedicated thread mostly blocked at recv() call. My question is: is it possible to implement the same scenario with a single thread? I.e. by registering some callback function? As a side note: I need implement this scenario in C++, Java and Python. Yes, it possible. You need to use an API that allows multiplexed I/O. Under C/C++ and Python

I am trying to understanding basics of Redis. One that that keep coming everywhere is, Redis is single threaded that makes things atomic.But I am unable to imagine how this is working internally.I have below doubt. Don't we design a server Single thread if it is IO bound application(like Node.js),where thread got free for another request after initiating IO operation and return data to client once IO operation is finished(providing concurrency). But in case of redis all data are available in Main Memory,We are not going to do IO operation at all.So then why Redis is single threaded?What will

Can someone please explain if there's really any advantage to writing a multi-threaded piece of code that runs on a single processor with a single core? E.g., a method that processes document pages such that the pages are mutually exclusive w/r/t the aforementioned piece of code. At first glance, it doesn't seem like there'd be an advantage because true multi-threading is not possible. I.e., the OS would have to context switch the threads anyway. I'm wondering if just coding something in a single-threaded manner could actually be more efficient. Clearly, there are plenty of cases where writing