web workers

html 5 web workers

   var worker = new Worker('worker.js');
   worker.onmessage = function (event) {
     document.getElementById('result').textContent = event.data;
   };

var n = 1;
search: while (true) {
  n += 1;
  for (var i = 2; i <= Math.sqrt(n); i += 1)
    if (n % i == 0)
     continue search;
  // found a prime!
  postMessage(n);
}

Using web workers - MDC

Workers provide a simple means for web content to run scripts in background threads. Once created, a worker can send messages to the spawning task by posting messages to an event handler specified by the creator.

http://www.0xdeadbeef.com/weblog/?p=1050

Worker Threads
* Spawn OS-threads to run JavaScript
* Avoids window freezing
* Simple communication methods with main thread
– postMessage(), onmessage and onerror
* Has XMLHttpRequest Access, timeouts

tag: javascript thread