From be026bdcb2c71501dffab4a04dabef682661e664 Mon Sep 17 00:00:00 2001
From: Disservin <disservin.social@gmail.com>
Date: Wed, 1 May 2024 15:10:23 +0200
Subject: [PATCH] Clear Workers after changing the network

ensures internal state (e.g. accumulator cache) is consistent with network

closes https://github.com/official-stockfish/Stockfish/pull/5204

No functional change
---
 src/engine.cpp | 10 +++++++---
 src/thread.cpp |  3 +++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/engine.cpp b/src/engine.cpp
index 72a37ce9..e8da24aa 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -141,14 +141,18 @@ void Engine::verify_networks() const {
 }
 
 void Engine::load_networks() {
-    networks.big.load(binaryDirectory, options["EvalFile"]);
-    networks.small.load(binaryDirectory, options["EvalFileSmall"]);
+    load_big_network(options["EvalFile"]);
+    load_small_network(options["EvalFileSmall"]);
 }
 
-void Engine::load_big_network(const std::string& file) { networks.big.load(binaryDirectory, file); }
+void Engine::load_big_network(const std::string& file) {
+    networks.big.load(binaryDirectory, file);
+    threads.clear();
+}
 
 void Engine::load_small_network(const std::string& file) {
     networks.small.load(binaryDirectory, file);
+    threads.clear();
 }
 
 void Engine::save_network(const std::pair<std::optional<std::string>, std::string> files[2]) {
diff --git a/src/thread.cpp b/src/thread.cpp
index 1438c9f9..9052654b 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -161,6 +161,9 @@ void ThreadPool::clear() {
     for (Thread* th : threads)
         th->worker->clear();
 
+    if (threads.size() == 0)
+        return;
+
     main_manager()->callsCnt                 = 0;
     main_manager()->bestPreviousScore        = VALUE_INFINITE;
     main_manager()->bestPreviousAverageScore = VALUE_INFINITE;