DLL thread safety

Simon Marlow marlowsd at gmail.com
Mon Feb 16 08:42:54 EST 2009

Neil Mitchell wrote:
> Hi,
> I'm building a DLL using the instructions here:
> http://www.haskell.org/ghc/docs/latest/html/users_guide/win32-dlls.html
> I must call startupHaskell before I make any calls to Haskell
> functions. However, that page doesn't detail any thread safety rules.
> In particular:
> * If I call startupHaskell on Thread 1, can I make Haskell calls from Thread 2.

Yes - but of course you must wait for startupHaskell, aka hs_init, to 
finish first.  Also you must compile with -threaded.

> * Can I make Haskell calls from both Thread 1 and Thread 2 simultaneously.

Yes, with -threaded.


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