From db46e5bb58ed12dbff38ceea402140cfa57b32cc Mon Sep 17 00:00:00 2001
From: Carmen Fan <wind5320@hotmail.com>
Date: Tue, 26 Apr 2022 15:18:38 +0100
Subject: [PATCH] ISSUE #571 default to 4 threads, make num threads
 configurable through ENV var

---
 ifcUtils/repo_ifc_utils_geometry_handler.cpp | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/ifcUtils/repo_ifc_utils_geometry_handler.cpp b/ifcUtils/repo_ifc_utils_geometry_handler.cpp
index 4278447bd..c4e7e98e3 100644
--- a/ifcUtils/repo_ifc_utils_geometry_handler.cpp
+++ b/ifcUtils/repo_ifc_utils_geometry_handler.cpp
@@ -104,7 +104,23 @@ bool repo::ifcUtility::SCHEMA_NS::GeometryHandler::retrieveGeometry(
 	IfcParse::IfcFile ifcfile(file);
 	auto itSettings = createSettings();
 
-	IfcGeom::Iterator<double> contextIterator(itSettings, &ifcfile);
+	char* value = getenv("REPO_NUM_THREADS");
+
+	int nThreads = 0;
+	try {
+		if (value && strlen(value) > 0) {
+			nThreads = std::stoi(value);
+		}
+	}
+	catch (...) {
+		//do nothing.
+	}
+
+	nThreads = nThreads ? nThreads : 4;
+
+	repoInfo << "Initialising Geom iterator with " << nThreads << "...";
+
+	IfcGeom::Iterator<double> contextIterator(itSettings, &ifcfile, nThreads);
 
 	try {
 		if (!contextIterator.initialize()) {