Hi Everyone, 

First of all, thank you for Racket; it is a great tool, specially the 
documentation.

I'm trying to use racket's futures to evaluate a function from a c library that 
takes some time to evaluate but according to the future visualizer, there is a 
block and it never runs on its own thread. The block is marked as 
scheme_force_value_same_mark.

The c function takes a string argument, loads a file from disk and returns a 
pointer to the data.

Is it possible to use futures with FFI-defined functions? If so, what rules 
would the c functions need to follow?

thanks,
carlos.

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