Add support for configuring process affinity

Author: levitation

ConfigParser.cs

@@ -67,6 +67,22 @@ public static string GetText(this IConfiguration config, params string[] section
             return null;
         }
 
+        public static List<long> GetLongList(this IConfiguration config, params string[] sectionKeyAlternateNames)
+        {
+            foreach (var sectionKeyAlternateName in sectionKeyAlternateNames)
+            {
+                var list = config.GetSection(sectionKeyAlternateName).GetList();
+                if (list.Count > 0)
+                { 
+                    return list
+                            .Select(text => long.Parse(text))   //NB! if the parameter exists then it must be in a proper numeric format
+                            .ToList();
+                }
+            }
+
+            return new List<long>();
+        }
+
         public static List<string> GetListUpperOnWindows(this IConfiguration config, bool? caseSensitiveFilenames, params string[] sectionKeyAlternateNames)
         {
             if (caseSensitiveFilenames == false || (caseSensitiveFilenames == null && !IsLinux))  //assume NTFS or FAT filesystem which are usually case-insensitive

Program.cs

@@ -38,6 +38,7 @@ internal static class Global
 
 
         public static bool UseIdlePriority = false;
+        public static List<long> Affinity = new List<long>();
 
         public static bool ShowErrorAlerts = true;
         public static bool LogInitialScan = false;
@@ -154,8 +155,9 @@ private static void Main()
 
 
             Global.UseIdlePriority = fileConfig.GetTextUpper("UseIdlePriority") == "TRUE";   //default is false
+            Global.Affinity = fileConfig.GetLongList("Affinity");
+
 
-            
             Global.ShowErrorAlerts = fileConfig.GetTextUpper("ShowErrorAlerts") != "FALSE";   //default is true
             Global.LogInitialScan = fileConfig.GetTextUpper("LogInitialScan") == "TRUE";   //default is false
             Global.LogToFile = fileConfig.GetTextUpper("LogToFile") == "TRUE";   //default is false
@@ -245,6 +247,29 @@ private static async Task MainTask()
                     }
                 }
 
+                if (Global.Affinity.Count > 0)
+                {
+                    try
+                    {
+                        var CurrentProcess = Process.GetCurrentProcess();
+
+                        long affinityMask = 0;
+                        foreach (var affinityEntry in Global.Affinity)
+                        {
+                            if (affinityEntry < 0 || affinityEntry > 63)
+                                throw new ArgumentException("Affinity");
+
+                            affinityMask |= (long)1 << (int)affinityEntry;
+                        }
+
+                        CurrentProcess.ProcessorAffinity = new IntPtr(affinityMask);
+                    }
+                    catch (Exception)
+                    {
+                        Console.WriteLine("Unable to set affinity.");
+                    }
+                }
+
 
                 ThreadPool.SetMaxThreads(16, 16);   //TODO: config
 

appsettings.example.json

@@ -2,6 +2,9 @@
     "Files": {
 
         "UseIdlePriority": false,
+        "Affinity": [0],
+
+
         "MaxFileSizeMB": 2048,
         "RetryCountOnSrcFileOpenError": 10,