[Haskell-cafe] GHCi and threads, was Connecting to a running process (REPL)

Simon Marlow simonmar at microsoft.com
Mon Dec 12 10:02:42 EST 2005

On 10 December 2005 23:45, Rohan Drape wrote:

> On Tue Dec 6 15:01:45 EST 2005 Tomasz Zielonka wrote:
>> Unfortunately it seems that forkIO'ed threads are freezed when GHCi
>> is waiting for command-line input. I bet it would be possible to let
>> the threads work in the background. I think the current behaviour is
>> caused by using readline, which is a foreign library. Or it is by
>> design?
> I also think this is unfortunate, and would like to know if this can
> be worked around (ie. I could happily live without readline if that is
> the issue and it can be switched off).

The fix is trivial: we have to add -threaded when we link GHCi.  The
only reason I haven't done this yet is because I'm being cautious; the
threaded RTS is a fair bit more complex that the non-threaded RTS.  I
think we'll schedule this for 6.6 though.


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