From c251767fbeacc95963a1c68feed976e8d492d3fc Mon Sep 17 00:00:00 2001
From: Matt Valentine-House <matt@eightbitraptor.com>
Date: Thu, 22 Jan 2026 23:01:41 +0000
Subject: [ruby/mmtk] Implement rb_gc_impl_during_gc_p

https://github.com/ruby/mmtk/commit/039fa648fe
---
 gc/mmtk/mmtk.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gc/mmtk/mmtk.c b/gc/mmtk/mmtk.c
index d5cfda1be9..4832916ce6 100644
--- a/gc/mmtk/mmtk.c
+++ b/gc/mmtk/mmtk.c
@@ -689,8 +689,8 @@ rb_gc_impl_start(void *objspace_ptr, bool full_mark, bool immediate_mark, bool i
 bool
 rb_gc_impl_during_gc_p(void *objspace_ptr)
 {
-    // TODO
-    return false;
+    struct objspace *objspace = objspace_ptr;
+    return objspace->world_stopped;
 }
 
 static void
-- 
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