Comment #2 on issue 2906 by TruSktr: Is there some way to detect when a
function's asynchronous processes have finished with traditional callbacks
or events?
http://code.google.com/p/v8/issues/detail?id=2906
What I mean is this:
Suppose the function asyncFunction is defined as follows.
var asyncFunction = function() {
setTimeout(function() {
// do nothing
}, 5000);
};
Notice that asyncFunction does not accept a callback as an argument and it
also also does not emit any events.
Now, suppose I can only use asyncFunction and cannot modify it.
How then would I be able to execute another function (let's call it
someOtherFunction, for example) after all the stuff in asyncFunction is
done?
As far as I know, it's not possible. What I'm suggesting is a new function
(let's call it whenAbsolutelyDone, for example) that can execute a function
passed to it and (in some way still to be implemented in the mechanisms
beneath JavaScript) detect when the stuff in the said function is
completely done, be it synchronous or asynchronous (but obviously 100%
synchronous functions are easy to deal with so the asynchronous cases are
what matter here).
So, considering that asyncFunction accepts no callback function and does
not emit any events, the new function would allow you to run a callback
after asyncFunction finishes like in the following example.
whenAbsolutelyDone(asyncFunction, function() {
// this function runs after everything in asyncFunction is done;
// approximately 5 seconds from the call to whenAbsolutelyDone in this
example.
});
Does that make sense? I don't think a feature like this exists yet.
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