Thread behavior in 7.8.3

[Michael Jones]

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.foss at gmail.com> wrote:

> Michael Jones <mike at 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