At Sun, 5 Aug 2012 15:02:10 -0600, Matthew Flatt wrote: > Beware that FFI callback memory management is slightly tricky with > scheme_add_managed():
I've added an `ffi/unsafe/custodian' library with a `register-custodian-shutdown' function to make this easier. The `register-custodian-shutdown' function also helps with a related problem: calling a shutdown callback when Racket exits. Most resources are released when the Racket process exits, but if an explicit release is needed, supply `#:at-exit? #t'. Of course, while `register-custodian-shutdown' makes custodian registration easier, there are still many low-level issues to consider --- such as the fact that the callback is invoked atomically in an unspecified Racket thread --- which is why it's under `ffi/unsafe'. ____________________ Racket Users list: http://lists.racket-lang.org/users
