[Haskell-cafe] Modifying Running Programs

Donald Bruce Stewart dons at cse.unsw.edu.au
Sun Aug 1 20:25:19 EDT 2004

> eBay modifies 30k lines of code per week while
> maintaining 99.92% uptime.
> Is there a way to force ghc (or some other Haskell
> implementation) to load new implementations of
> functions without restarting the program?
> Alternatively, is there a way of restarting a
> program with new code without having to
> reconstruct all its in memory state?

You could consider using hs-plugins:

the example at the bottom of 

shows how to load a new object into a running program, changing an
already existing function on the fly. This uses GHC's dynamic linker

-- Don

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