Issue #22128 has been updated by ianks (Ian Ker-Seymer). I came to a similar conclusion when trying the send `Time` across Ractor ports: ``` c /* before: walk each moved object's refs under the VM lock, on every move */ for (size_t i = 0; i < obj->ref_count; i++) if (!rb_ractor_shareable_p(obj->refs[i])) return false; /* after: the type vouches for its refs once, at definition time */ if (RTYPEDDATA_TYPE(obj)->flags & RUBY_TYPED_ONLY_SHAREABLE_REFS) return true; ``` Which works in the happy path, but as John mentioned, falls apart with Time.zone and arbitrary ivar_set. ---------------------------------------- Feature #22128: C API: Expose RB_OBJ_SET_FROZEN_SHAREABLE https://bugs.ruby-lang.org/issues/22128#change-117758 * Author: byroot (Jean Boussier) * Status: Open ---------------------------------------- ### Context I'm trying to experiment with adapting Active Record for a Ractor architecture. Since database connections can't possibly be Ractor shareable, the idea is to warp each connection inside its own ractor, and then send SQL queries and responses through a port. But for this to perform well, I'd like to directly build the query response as a fully shareable object, so that it can be pushed into the port for free, instead of having Ruby need to recursively walk the potentially large response to mark objects as shareable. Here's an example of how it would work in trilogy: https://github.com/trilogy-libraries/trilogy/pull/299 ### Problem Unfortunately, the necessary API isn't currently exposed in the C API: - `RB_OBJ_SET_FROZEN_SHAREABLE` - `RB_OBJ_SET_SHAREABLE` / `rb_obj_set_shareable` I understand that this API could potentially be misused, but given it's a C API, I believe it's acceptable to require care from the caller. ### Benchmark ```ruby # frozen_string_literal: true require 'trilogy' require 'benchmark/ips' baseline = Trilogy.new(database: "test") shareable = Trilogy.new(database: "test", shareable: true) values = { null_test: "test", bit_test: "test", single_bit_test: 1, tiny_int_test: 2, bool_cast_test: true, small_int_test: 4, medium_int_test: 23434, int_test: 324234, big_int_test: 234234, unsigned_big_int_test: 23423423, float_test: 234234, float_zero_test: 213.23, double_test: 23123.12323, decimal_test: 123213.12312, decimal_zero_test: 213213.21323, date_test: "2026-01-30", date_time_test: "2026-01-30 14:03:56", date_time_with_precision_test: "2026-01-30 14:03:56.12", time_with_precision_test: "2026-01-30 14:03:56.12", timestamp_test: "2026-01-30 14:03:56.12", varchar_test: "VARCHAR" } baseline.query("DELETE FROM trilogy_test") insert = "INSERT INTO trilogy_test(#{values.keys.join(", ")}) VALUES (#{values.values.map(&:inspect).join(", ")})" 1000.times do baseline.query(insert) end p shareable.query("SELECT * FROM test.trilogy_test").to_a.size Benchmark.ips do |x| x.report("baseline") { Ractor.make_shareable(baseline.query("SELECT * FROM trilogy_test")) } x.report("shareable") { Ractor.make_shareable(shareable.query("SELECT * FROM trilogy_test")) } x.compare!(order: :baseline) end ``` ``` ruby 4.1.0dev (2026-06-24T13:17:28Z expose-ractor-set-.. f9d7dd50cd) +PRISM [arm64-darwin25] Warming up -------------------------------------- baseline 42.000 i/100ms shareable 66.000 i/100ms Calculating ------------------------------------- baseline 220.024 (±43.2%) i/s (4.54 ms/i) - 1.134k in 5.153976s shareable 677.487 (± 2.4%) i/s (1.48 ms/i) - 3.432k in 5.065782s Comparison: baseline: 220.0 i/s shareable: 677.5 i/s - 3.08x faster ``` -- https://bugs.ruby-lang.org/