I'm trying to write some racket code which interfaces with a foreign
library and provides a safe interface. Some of the functions I'm calling
allocate memory and need to have this explicitly freed by the caller. The
'allocator' binding from ffi/unsafe/alloc seems to solve this problem, but
I'm running into issues using it from places other than the main one. The
issue is that if a place gets shut down then the finalizer that was
registered don't seem to run, and I can observe the leaked memory at the
process level.

I took a look at ffi/unsafe/custodian and it seems that
register-custodian-shutdown would allow this to be implemented. Is there a
reason that such allocator doesn't do this by default?


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