Core/World: Allow specifying minimum world updates diff in config

(cherry picked from commit 29a4153f00)

src/server/worldserver/Main.cpp

@@ -70,8 +70,6 @@ namespace fs = boost::filesystem;
     #define _TRINITY_CORE_CONFIG  "worldserver.conf"
 #endif
 
-#define WORLD_SLEEP_CONST 1
-
 #ifdef _WIN32
 #include "ServiceWin32.h"
 char serviceName[] = "worldserver";
@@ -489,6 +487,7 @@ void ShutdownCLIThread(std::thread* cliThread)
 
 void WorldUpdateLoop()
 {
+    uint32 minUpdateDiff = uint32(sConfigMgr->GetIntDefault("MinWorldUpdateTime", 1));
     uint32 realCurrTime = 0;
     uint32 realPrevTime = getMSTime();
 
@@ -504,10 +503,10 @@ void WorldUpdateLoop()
         realCurrTime = getMSTime();
 
         uint32 diff = getMSTimeDiff(realPrevTime, realCurrTime);
-        if (!diff)
+        if (diff < minUpdateDiff)
         {
             // sleep until enough time passes that we can update all timers
-            std::this_thread::sleep_for(std::chrono::milliseconds(1));
+            std::this_thread::sleep_for(Milliseconds(minUpdateDiff - diff));
             continue;
         }
 

src/server/worldserver/worldserver.conf.dist

@@ -361,6 +361,13 @@ SessionAddDelay = 10000
 
 GridCleanUpDelay = 300000
 
+#
+#    MinWorldUpdateTime
+#        Description: Minimum time (milliseconds) between world update ticks (for mostly idle servers).
+#        Default:     1 - (0.001 second)
+
+MinWorldUpdateTime = 1
+
 #
 #    MapUpdateInterval
 #        Description: Time (milliseconds) for map update interval.