On Sunday, 2011-09-11, Alex Schuster wrote: > Kevin Krammer writes: > > On Sunday, 2011-09-11, Alex Schuster wrote: > > > Tim Edwards writes: > > > > My theory is it looks like the Pyweather widget is hanging trying > > > > to get data sometimes, and this in turn hangs plasma-desktop. > > > > Which, if true, is IMHO a huge design fault in plasma-desktop. > > > > Anyway I'll see if this theory holds out, Pyweather's been removed > > > > and so far no freezes. > > > > > > Yes, that's the problem with plasma-desktoüp, it's single threaded, > > > and if one plasmoid hangs, whole plasma hangs. I often had such > > > trouble when using plasmoids I downloaded fron the net. > > > > > > I also believe it's a huge design fault, but there _are_ indeed > > > reasons for doing this, having to do with speed mainly I think. I > > > don't find the link right now where this was explained, but if you > > > are interested, I could search and find it. > > Here it is: > http://www.freehackers.org/thomas/2009/11/10/wonders-from-a-kde-fan-and-dev > eloper-about-some-kde-design-choices/comment-page-1/#comment-7507 > > > Retrieving data could still be done asynchronously, KDE's networking > > can do that even in a single threaded application. > > Sure, I didn't want to imply that was a problem. I didn't think you were, just explaining that there should be no blocking due to downloading data unless something is wrong. > > Looks like the respective applet or whatever it is using for > > downloading data is broken. > > And it's bad that this is able to make plasma hang. Unless proven otherwise I will assume that it is not. As in I really don't see how non-blocking downloading could block an application unless the application specifically blocks itself, which I would consider a bug. > In the days of > cooperative multitasking, every application could make your system hang - > these days are over. I've never had one application hang the system. Doesn't happen in this context either, the OP reports everything other than the hanging application working fine. > But for plasma, it's still like this. Highly unlikely. Since it did not happen for the OP, can you point to a report were hanging Plasma resulted in no other processes working either? > And it's > happened really often to me. Sounds like a serious kernel issue of your operating system to me. Modern operating system have pretty good isolation between processes. Cheers, Kevin -- Kevin Krammer, KDE developer, xdg-utils developer KDE user support, developer mentoring
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