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>>>>> "Shiro" == Shiro Kawai <shiro@xxxxxxxx> writes: Shiro> Regarding "Keeping C data structures in the Scheme heap". Shiro> Do we limit it to have simple structures that have no Shiro> pointers to outside resource? Otherwise we have some Shiro> issues: Shiro> - If we want to keep C structures that has pointers, Shiro> in Scheme heap, we need a hook to tell GC about it. The idea is that you either keep those pointers somewhere in the Scheme world or register them via SCHEME_GC_PROTECT_GLOBAL and manage them manually. We punted on this whole issue because (as you noticed) it requires bringing in a whole bunch of complex machinery. (See, say, the Objective Caml FFI for an idea just how complex.) Moreover, in my experience, keeping the references in Scheme usually makes a lot of things easier. Shiro> - Related to above; if we want to keep C structures that Shiro> has handles for extrenal resouces (externally allocated Shiro> memory, opened file descriptor, etc.), we need a kind of Shiro> finalization mechanism. That's also something meant to be done in Scheme. -- Cheers =8-} Mike Friede, Völkerverständigung und überhaupt blabla