From 4f85e05505b24a36cc5f254b1a9a5c42f04bd0e0 Mon Sep 17 00:00:00 2001
From: Jochen Topf <jochen@topf.org>
Date: Mon, 14 Aug 2023 11:42:56 +0200
Subject: [PATCH] Generalizer: Don't run more threads than there are tiles

---
 src/gen/osm2pgsql-gen.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/gen/osm2pgsql-gen.cpp b/src/gen/osm2pgsql-gen.cpp
index 41626287a..14ba2fd6d 100644
--- a/src/gen/osm2pgsql-gen.cpp
+++ b/src/gen/osm2pgsql-gen.cpp
@@ -472,7 +472,9 @@ class genproc_t
             log_debug("Running in multi-threaded mode.");
             std::mutex mut;
             std::vector<std::thread> threads;
-            for (unsigned int n = 1; n <= m_jobs; ++n) {
+            for (unsigned int n = 1;
+                 n <= std::min(m_jobs, static_cast<uint32_t>(tile_list.size()));
+                 ++n) {
                 threads.emplace_back(run_tile_gen, m_conninfo, generalizer,
                                      params, zoom, &tile_list, &mut, n);
             }