Problems with openFd and -threaded

wren ng thornton wren at
Sun Nov 28 00:05:39 EST 2010

So I've just started playing around with STM and -threaded programs and 
I've run into a bug. The bug is similar to [1] except that the file in 
question is a Posix FIFO instead of a Bluetooth device. Same behavior: 
always errors with -threaded, but expected behavior when not -threaded 
(i.e., blocks until another process opens the other end of the FIFO). 
GHC version is 6.12.1.

In the previous thread Simon confirmed that it's a bug and said he'd fix 
it, but I didn't see any ticket mentioned. Does anyone know if there's a 
ticket for it, or when it will be/has been fixed?


Live well,

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