change: raise minimal worker parallelism suggestion for threaded worl…

…d-gen to 4

Also prints a warning when that is being done

c2me-threading-worldgen/src/main/java/com/ishland/c2me/threading/worldgen/ModuleEntryPoint.java

@@ -1,19 +1,28 @@
 package com.ishland.c2me.threading.worldgen;
 
+import com.ishland.c2me.base.common.GlobalExecutors;
 import com.ishland.c2me.base.common.config.ConfigSystem;
 import com.ishland.c2me.threading.worldgen.common.Config;
-
-import static com.ishland.c2me.base.ModuleEntryPoint.defaultParallelism;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 class ModuleEntryPoint {
 
+    public static final Logger LOGGER = LoggerFactory.getLogger("C2ME Threaded WorldGen");
+
     public static final boolean enabled = new ConfigSystem.ConfigAccessor()
             .key("threadedWorldGen.enabled")
-            .comment("Whether to enable this feature")
-            .getBoolean(defaultParallelism >= 3, false);
+            .comment("""
+                    Whether to enable this feature\s
+                     This feature may cause regression when worker parallelism is lower than 4.
+                     """)
+            .getBoolean(GlobalExecutors.GLOBAL_EXECUTOR_PARALLELISM >= 4, false);
 
     static {
         Config.init();
+        if (enabled && GlobalExecutors.GLOBAL_EXECUTOR_PARALLELISM < 4) {
+            LOGGER.warn("WARNING: Global worker parallelism is lower than 4 and threaded worldgen is enabled. This may cause regression in worldgen performance");
+        }
     }
 
 }