From bea707a9df6cf026b495939ad94472197c6be4ba Mon Sep 17 00:00:00 2001
From: Matthias Koefferlein <matthias@klayout.de>
Date: Fri, 25 Oct 2024 00:40:42 +0200
Subject: [PATCH] Releasing the lock when the iterator is at end - otherwise a
 finished iterator could still block the layout (potential Ruby GC issue)

---
 src/db/db/dbRecursiveShapeIterator.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/db/db/dbRecursiveShapeIterator.cc b/src/db/db/dbRecursiveShapeIterator.cc
index feff72f32..e3872f485 100644
--- a/src/db/db/dbRecursiveShapeIterator.cc
+++ b/src/db/db/dbRecursiveShapeIterator.cc
@@ -695,6 +695,12 @@ RecursiveShapeIterator::next (RecursiveShapeReceiver *receiver)
       next_shape (receiver);
     }
 
+    if (at_end ()) {
+      //  release the layout lock if at end - this way, the shape iterator can be
+      //  held further, without blocking the layout.
+      m_locker = db::LayoutLocker ();
+    }
+
   }
 }