We all know that it is not possible,...but... using timers along with path-through routines that don't block might sound like a cool alternative. I have tried it and it works - picture this:
function doLongTask(x,y,z, callback)
{
this.X = x;
this.Y = y;
this.Z = z;
this.doneCallback=callback;
}
doLongTask.prototype.threadSpin = _longtask_threadspin;
function _longtask_threadspin()
{
//instead of long loops save your intermediate state in this.{vars}
this.X++;
if (this.X%100==0) this.Z = this.Y - 100; //some logic that would have been in a tight loop
if (this.X>1000) this.doneCallback();
}
And now we can easily:
var task = new doLongTask(1,2,3,doneLongTask);
var tmr = setInterval(task.threadSpin, 10/*time slice!!!*/);
function doneLongTask()
{
task.Z // result of task
clearInterval(tmr);// kill 'thread'
}
17 comments:
COOL, this should be ok - no closures problems either
Yes, speaking of closures I am trying to avoid this pattern:
this.X = function(){.....}
as much as I can because
eventually this will crash IE
helped, thanks
such a waste
I heard Chrome v8 compiles js to bin maybe those guys give access to real thing threads _xeh_
I'm newbie here, I hope to get friends at this forum
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