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c0013b3a8f
First increment of typed host callbacks (roadmap #1): the data-structure layer, independent of the FFI thread and the macro so it can be unit-tested in isolation. - FFIHostRegistry: wire-name -> (host fn ptr, userData). A missing entry is a normal outcome (the imported proc errors), never a crash — never-crash policy. nil fn unregisters. - FFIPendingTable: monotonic token -> the chronos Future an awaiting {.ffiHost.} proc is blocked on. completePending drops unknown/double completions; failAllPending errors every outstanding future on teardown so no awaiting handler is abandoned. Both lock-guarded so a host thread and the FFI thread can touch them concurrently; futures are only ever completed on the FFI thread. 6 unit tests pass under orc and refc. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
nim-ffi
Allows exposing Nim projects to other languages
Example
examples/timer is now a self-contained Nimble project that imports nim-ffi directly.
Use cd examples/timer && nimble install -y ../.. && nimble build to compile the example.