From b9188901c07649c3af3a5f925ec0dead444a4134 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Mon, 27 Oct 2025 18:14:28 +0900
Subject: allow Ractor::Port shareable

---
 ractor_sync.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ractor_sync.c b/ractor_sync.c
index c208ee6b2d..57ae13e88d 100644
--- a/ractor_sync.c
+++ b/ractor_sync.c
@@ -49,7 +49,7 @@ static const rb_data_type_t ractor_port_data_type = {
         ractor_port_memsize,
         NULL, // update
     },
-    0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
+    0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_FROZEN_SHAREABLE,
 };
 
 static st_data_t
@@ -72,6 +72,7 @@ ractor_port_alloc(VALUE klass)
 {
     struct ractor_port *rp;
     VALUE rpv = TypedData_Make_Struct(klass, struct ractor_port, &ractor_port_data_type, rp);
+    rb_obj_freeze(rpv);
     return rpv;
 }
 
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