On 12 January 2012 23:14, Brandon Allbery wrote:

On Thu, Jan 12, 2012 at 14:35, Bas van Dijk wrote:

...

2) If an asynchronous exception was thrown to the stdout/stderr-read-thread it did not execute the putMVar anymore resulting in a dead-lock when takeMVar was executed.

Hah.  I knew something like this was in there; xmonad is hanging instead of catching an exception or signal when the far end of a pipe (usually xmobar) goes away.

It's good to hear that these fixes can actually solve a real problem :-) BTW I updated the patch in the ticket because I forgot to 'restore' the masking state in the IO processing code. Cheers, Bas