Linked by Hadrien Grasland on Fri 27th May 2011 11:34 UTC
General Development After having an interesting discussion with Brendan on the topic of deadlocks in threaded and asynchronous event handling systems (see the comments on this blog post), I just had something to ask to the developers on OSnews: could you live without blocking API calls? Could you work with APIs where lengthy tasks like writing to a file, sending a signal, doing network I/O, etc is done in a nonblocking fashion, with only callbacks as a mechanism to return results and notify your software when an operation is done?
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RE: Callback fragmentation
by Neolander on Sat 28th May 2011 09:48 UTC in reply to "Callback fragmentation"
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I don't understand: why would the code require a notification each time a data structure changes after having started a big operation on it, instead of asking for a notification once the big operation is over? More important, why would they put a very intensive callback function on something as fine-grained as changing a data structure ?

If you can prove that this is a valid use case and not poor programming practices at work, a feature that gives notifications a "cooldown time" could indeed be the right answer.

Edited 2011-05-28 09:52 UTC

Reply Parent Score: 1

RE[2]: Callback fragmentation
by ndrw on Sun 29th May 2011 04:36 in reply to "RE: Callback fragmentation"
ndrw Member since:

Well, that's a simple MVC pattern at work, which is also a kind of an asynchronous framework. I wouldn't call it a bad programming practice, quite the opposite. It does what it is designed for - separating concerns. The idea is that you do what you want to do on the Model and leave the task of updating the View to the framework.

And it works well too, if only you remember not to use the naive implementation for anything but the simplest models.

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RE[3]: Callback fragmentation
by Neolander on Sun 29th May 2011 07:38 in reply to "RE[2]: Callback fragmentation"
Neolander Member since:

Point taken ;)

(Partly because of your explanation, and partly because I've also thought that preventing a notification to be fired at fast rates prevents local DoS attacks on things which don't need extreme reactivity)

Reply Parent Score: 1