Is there a way of calling exported 'dynamic export' functions in a thread-safe manner? I have this problem in JVM-Bridge... This is what the main thread does, from Haskell: 1. starts the Java VM, which starts a bunch of other threads, including the AWT thread; 2. creates a pointer to a some IO function 'paint', using a 'dynamic export' callback-maker; 3. creates a new Java Frame (i.e. a GUI window) with the function-pointer; 4. repeatedly calls the Java Thread.yield function for 20 seconds. (the program then ends) Now, once the Java Frame has been created, the AWT thread will occasionally call the 'paint' method, which ends up calling the function-pointer. However, it seems GHC 5.02 'dynamic export' calls are not thread-safe, and sooner or later it crashes, either with a seg violation or a complaint about unknown closure types. -- Ashley Yakeley, Seattle WA