On Fri, Jul 27, 2012 at 9:52 AM, Marco Túlio Gontijo e Silva
I thought that the only thing I needed to take care while using unsafePerformIO was knowing that the time of execution is undetermined and that it could even run more than once. This is not a problem for my logging. Is there something else I should be aware while using unsafePerformIO?
Another thing to be aware of is that unsafePerformIO and STM don't interact well. In particular, STM will abort doomed transactions. If the transaction is IO that has exception handlers set up, those handlers won't be run. This is the case for unsafeIOToSTM, but I'm not sure if it's the case for unsafePerformIO as well. Are you using STM in your program? Also, what version of GHC are you using? -Joey