Thread behavior in 7.8.3

Ben Gamari bgamari.foss at
Tue Jan 13 20:02:54 UTC 2015

Michael Jones <mike at> writes:

> Sorry I am reviving an old problem, but it has resurfaced, such that
> one system behaves different than another.

> 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`` 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.


- Ben

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