Add Advanced Config parameter for thread count

Allows us to limit the threading state manually without recompiling

common/advanced_config.cpp

@@ -121,9 +121,9 @@ static const wxChar EnableExtensionSnaps[] = wxT( "EnableExtensionSnaps" );
 static const wxChar ExtensionSnapTimeoutMs[] = wxT( "ExtensionSnapTimeoutMs" );
 static const wxChar ExtensionSnapActivateOnHover[] = wxT( "ExtensionSnapActivateOnHover" );
 static const wxChar EnableSnapAnchorsDebug[] = wxT( "EnableSnapAnchorsDebug" );
-static const wxChar EnableJobset[] = wxT( "EnableJobset" );
 static const wxChar MinParallelAngle[] = wxT( "MinParallelAngle" );
 static const wxChar HoleWallPaintingMultiplier[] = wxT( "HoleWallPaintingMultiplier" );
+static const wxChar MaximumThreads[] = wxT( "MaximumThreads" );
 
 } // namespace KEYS
 
@@ -296,6 +296,8 @@ ADVANCED_CFG::ADVANCED_CFG()
     m_MinParallelAngle = 0.001;
     m_HoleWallPaintingMultiplier = 1.5;
 
+    m_MaximumThreads = 0;
+
     loadFromConfigFile();
 }
 
@@ -565,6 +567,10 @@ void ADVANCED_CFG::loadSettings( wxConfigBase& aCfg )
                                                   &m_HoleWallPaintingMultiplier, m_HoleWallPaintingMultiplier,
                                                   0.1, 100.0 ) );
 
+    configParams.push_back( new PARAM_CFG_INT( true, AC_KEYS::MaximumThreads,
+                                                  &m_MaximumThreads, m_MaximumThreads,
+                                                  0, 500 ) );
+
     // Special case for trace mask setting...we just grab them and set them immediately
     // Because we even use wxLogTrace inside of advanced config
     wxString traceMasks;

include/advanced_config.h

@@ -707,6 +707,15 @@ public:
      */
     double m_HoleWallPaintingMultiplier;
 
+    /**
+     * Default value for the maximum number of threads to use for parallel processing.
+     * Setting this value to 0 or less will mean that we use the number of cores available
+     *
+     * Setting name: "MaximumThreads"
+     * Default value: 0
+     */
+    int m_MaximumThreads;
+
 ///@}
 
 private:

include/singleton.h

@@ -21,6 +21,7 @@
 #define KICAD_SINGLETON_H
 
 #include <bs_thread_pool.hpp>
+#include <advanced_config.h>
 
 class KICAD_SINGLETON
 {
@@ -38,7 +39,8 @@ public:
 
     void Init()
     {
-        m_ThreadPool = new BS::thread_pool();
+        int num_threads = std::max( 0, ADVANCED_CFG::GetCfg().m_MaximumThreads );
+        m_ThreadPool = new BS::thread_pool( num_threads );
     }
 
     BS::thread_pool* m_ThreadPool;