Kotlin spike - #1
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… over Panama ioma_route_ffi registers a plain C function pointer with a flat, padding-free request (ten 8-byte fields) and reply (32 bytes) so any binding can lay them out. Such a handler must not run on a coroutine's 64 KB stack (a JVM bounds-checks and walks the thread's real stack), so the coroutine parks with await_call and the loop runs it on the worker's own thread stack, then resumes the coroutine with the reply. Every resume goes through run_coro, which services those calls. Middleware still wraps foreign endpoints. playground/kotlin: Server.kt loads libioma.so through java.lang.foreign, turns two Kotlin functions into upcall stubs, registers them and hands the main thread to ioma_run. Allocation-free on the hot path; reads the request and writes the reply straight in C memory. Verified: a C test asserts the handler lands on the 8 MB thread stack; sums, chunked bodies, 404 and the fragmentation sweep pass from Kotlin. On 4 pinned cores the Kotlin handler does ~1.18M req/s vs ~1.26M native (JDK 26.0.2.1). Claude-Session: https://claude.ai/code/session_013wYnJvEFUjKEpGLkyTLt9P
One upcall dispatcher serves every route (the route index rides in userdata), per-thread Request/Reply wrappers hide the offsets and reinterprets, and the app is just routes with lambdas. Same throughput as the hand-rolled version (~1.17M req/s on 4 cores, JDK 26); sums, chunked, 404 and the fragmentation sweep pass. Claude-Session: https://claude.ai/code/session_013wYnJvEFUjKEpGLkyTLt9P
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