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J. Nick Koston
9733c28c40
In yield_with_select_(), the fast select path iterated all monitored sockets and called esphome_lwip_socket_has_data(fd) for each one. That C function called lwip_socket_dbg_get_socket(fd) — a cross- compilation-unit call that can't be inlined because sockets[] is static in lwip's sockets.c. The actual rcvevent check is ~4 instructions, but the lookup adds entry/retw window overhead on Xtensa (~8-12 cycles per socket per loop iteration). Now lwip_sock* pointers are cached at socket registration time and stored directly in monitored_sockets_. The hot path iterates pointers and reads rcvevent with no fd lookup. esphome_lwip_hook_socket() also takes lwip_sock* directly, avoiding a redundant get_sock() call. API split for fast select vs fallback select: - register_socket(lwip_sock*) / unregister_socket(lwip_sock*) - register_socket_fd(int fd) / unregister_socket_fd(int fd) Chained on top of socket-devirtualize (#14398).
