Ben, Interesting.
In this case, I can duplicate the problem when not using USB (USB to i2c dongle) by using /dev/i2c_n, and when I do use USB, in some cases the USB is working (can see i2c on scope), but the GUI is hung. So I believe this is not causing the problem. Thanks, Mike On Jan 13, 2015, at 1:02 PM, Ben Gamari <bgamari.f...@gmail.com> wrote: > Michael Jones <m...@proclivis.com> writes: > >> Sorry I am reviving an old problem, but it has resurfaced, such that >> one system behaves different than another. >> > [snip] > >> 1) Does ghc 7.8.4 have any improvements that might pertain to these kinds of >> scheduling/thread problems? >> 2) Is there anything about the nature of a thread using USB, I2C, or >> wxHaskell IO that leads to problems that a pure calculation app would not >> have? > > Do you know about [1]? This is a regression due to an interface change > that arose from the new event manager. `usb` 1.3.0.0` has a workaround, > GHC 7.10 will have a fixed event manager [2]. > > Given that it sounds like your program works some of the time this may > not be relevant but I thought it would be negligent not to mention it. > > Cheers, > > - Ben > > > [1] https://github.com/basvandijk/usb/issues/7 > [2] https://phabricator.haskell.org/D347 _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
