From 25edc91976c84cdb571c63e7f10df12a1f22fa04 Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Sat, 28 Jan 2023 14:19:55 +0100
Subject: [PATCH] #2704 retain kernel pool to free cache

---
 src/ifcgeom/IfcGeomIteratorImplementation.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/ifcgeom/IfcGeomIteratorImplementation.h b/src/ifcgeom/IfcGeomIteratorImplementation.h
index 88083d6643..4f7ab5ecba 100644
--- a/src/ifcgeom/IfcGeomIteratorImplementation.h
+++ b/src/ifcgeom/IfcGeomIteratorImplementation.h
@@ -132,8 +132,12 @@ namespace IfcGeom {
 		MAKE_TYPE_NAME(IteratorImplementation_)(const MAKE_TYPE_NAME(IteratorImplementation_)&); // N/I
 		MAKE_TYPE_NAME(IteratorImplementation_)& operator=(const MAKE_TYPE_NAME(IteratorImplementation_)&); // N/I
 
+		// When single-threaded
 		MAKE_TYPE_NAME(Kernel) kernel;
 
+		// When multi-threaded
+		std::vector<MAKE_TYPE_NAME(Kernel)*> kernel_pool;
+
 		IteratorSettings settings;
 		IfcParse::IfcFile* ifc_file;
 		std::vector<filter_t> filters_;
@@ -312,7 +316,6 @@ namespace IfcGeom {
 				conc_threads = tasks_.size();
 			}
 
-			std::vector<MAKE_TYPE_NAME(Kernel)*> kernel_pool;
 			kernel_pool.reserve(conc_threads);
 			for (unsigned i = 0; i < conc_threads; ++i) {
 				kernel_pool.push_back(new MAKE_TYPE_NAME(Kernel)(kernel));
@@ -1219,6 +1222,10 @@ namespace IfcGeom {
 				delete p;
 			}
 
+			for (auto& k : kernel_pool) {
+				delete k;
+			}
+
 			free_shapes();
 		}
 	};