18 Jan
2012
18 Jan
'12
6:28 p.m.
Main.hs does not open fromA at all. (fromA_IO is dead code.) This causes fifo2.c to be hung whenever it opens fromA. From the man page of mkfifo(3) on Linux: "Opening a FIFO for reading normally blocks until some other process opens the same FIFO for writing, and vice versa. See fifo(7) for nonblocking handling of FIFO special files." In the sister thread in haskell-cafe, the addition of unsafePerformIO throws further disorder into these highly order-sensitive operations.