From 99c97f75e2b93ea2cb36f126cd75b298bda5f5a9 Mon Sep 17 00:00:00 2001
From: Bjørn Lindeijer <bjorn@lindeijer.nl>
Date: Sun, 14 May 2006 16:47:52 +0000
Subject: Applied a patch by Guillaume that makes the server sleep between
 ticks instead of polling for the next one. Somebody will need to verify that
 this works for on Dev-C++ as well.

---
 src/main.cpp        | 12 ++++--------
 src/utils/timer.cpp | 12 ++++++++++++
 src/utils/timer.h   | 42 +++++++++++++++++++++++-------------------
 3 files changed, 39 insertions(+), 27 deletions(-)

(limited to 'src')

diff --git a/src/main.cpp b/src/main.cpp
index 22ac6a2a..db594c76 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -319,7 +319,7 @@ void parseOptions(int argc, char *argv[])
 int main(int argc, char *argv[])
 {
     int elapsedWorldTicks;
-    
+
     LOG_INFO("The Mana World Server v" << PACKAGE_VERSION, 0)
 
     // Parse Command Line Options
@@ -402,11 +402,7 @@ int main(int argc, char *argv[])
             // - Update all active objects/beings
             state.update(*connectionHandler);
         }
-        else {
-            // when there is nothing to do give away some processor time to 
-            // other tasks
-            sched_yield();
-        };
+        worldTimer.sleep();
 
         /*ENetEvent netEvent;
 
@@ -442,13 +438,13 @@ int main(int argc, char *argv[])
                     enet_packet_destroy(netEvent.packet);
                 }
                     break;
-                
+
                 case ENET_EVENT_TYPE_DISCONNECT:
                     printf("%s disconected.\n", netEvent.peer->data);
 
                     netEvent.peer->data = NULL;
                     break;
-                    
+
                 default:
                     printf("Unhandled enet event\n");
                     break;
diff --git a/src/utils/timer.cpp b/src/utils/timer.cpp
index 97965c75..0e9a6a7e 100644
--- a/src/utils/timer.cpp
+++ b/src/utils/timer.cpp
@@ -19,6 +19,7 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#include <time.h>
 #include "timer.h"
 
 namespace tmwserv
@@ -33,6 +34,17 @@ Timer::Timer(unsigned int ms, bool createActive)
     lastpulse = getTimeInMillisec();
 };
 
+void Timer::sleep()
+{
+    if (!active) return;
+    uint64_t now = getTimeInMillisec();
+    if (now - lastpulse >= interval) return;
+    struct timespec req;
+    req.tv_sec = 0;
+    req.tv_nsec = (interval - (now - lastpulse)) * (1000 * 1000);
+    nanosleep(&req, 0);
+}
+
 int Timer::poll()
 {
     int elapsed = 0;
diff --git a/src/utils/timer.h b/src/utils/timer.h
index a921a828..603d24cd 100644
--- a/src/utils/timer.h
+++ b/src/utils/timer.h
@@ -43,54 +43,58 @@ namespace utils
 /**
  * This class is for timing purpose as a replacement for SDL_TIMER
  */
-
 class Timer
 {
     public:
         /**
-        * Constructor.
-        */
+         * Constructor.
+         */
         Timer(unsigned int ms, bool createActive = true);
 
         /**
-        * returns the number of elapsed tics since last call
-        */
+         * Returns the number of elapsed ticks since last call.
+         */
         int poll();
 
         /**
-        * activates the timer
-        */
+         * Sleeps till the next tick occurs.
+         */
+        void sleep();
+
+        /**
+         * Activates the timer.
+         */
         void start();
 
         /**
-        * deactivates the timer
-        */
+         * Deactivates the timer.
+         */
         void stop();
 
         /**
-        * changes the interval between two pulses
-        */
+         * Changes the interval between two pulses.
+         */
         void changeInterval (unsigned int newinterval);
 
     private:
         /**
-        * calls gettimeofday() and converts it into milliseconds
-        */       
+         * Calls gettimeofday() and converts it into milliseconds.
+         */
         uint64_t getTimeInMillisec();
 
         /**
-        * interval between two pulses
-        */
+         * Interval between two pulses.
+         */
         unsigned int interval;
 
         /**
-        * the time the last pulse occured
-        */
+         * The time the last pulse occured.
+         */
         uint64_t lastpulse;
 
         /**
-        * activity status of the timer
-        */
+         * Activity status of the timer.
+         */
         bool active;
 };
 
-- 
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