> I later ran into another problem that may or may not be
> related with the
> first. This is the program I am running:
>
> module Main where
> import Posix
>
> main = do
> installHandler sigCONT (Catch (putStrLn "- resumed
> -")) Nothing
> forever $ do
> c <- getChar
> putChar c
>
> forever = sequence_ . repeat
>
> This is the output from a conversation with the shell:
>
> % ./program &
> [2] 8959
> [2] + Suspended (tty input) ./program
> % fg
> ./program
> a
> a
> b
> b
> c
> c
> d
> d
> e
> e- resumed -
Interesting! What's happening is the shell is putting stdin back into
blocking mode during the suspend/resume, which stops GHC's I/O subsystem
from letting other threads run when the process is restarted. I've
committed a fix, which catches SIGCONT in the RTS and put stdin back
into O_NONBLOCK mode.
Cheers,
Simon
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