with huge learning curves, that produce complicated, hard to maintain code.

Can't agree with this statement, I had to work with some projects with POE and AnyEvent and it wasn't especially hard to learn and maintain. On the other hand I will not call threads simple, as most people (I'm judging by code I had to work with) either had no idea that they need to lock shared variable before accessing it at all, or are not able to implement it properly.

In reply to Re^2: threads and their alternatives by zwon
in thread Alternatives to threads for maintaining GUI app responsiveness by metaperl

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