Add support for tracking server-thread tasks too

This allows us to track how much work various peripherals are doing.
This will not work with all systems, such as Plethora, as that has its
own execution system.

src/main/java/dan200/computercraft/core/computer/ComputerThread.java

@@ -69,17 +69,17 @@ public class ComputerThread
             s_stopped = false;
             if( s_threads == null || s_threads.length != ComputerCraft.computer_threads )
             {
-                s_threads = new Thread[ ComputerCraft.computer_threads ];
+                s_threads = new Thread[ComputerCraft.computer_threads];
             }
 
             SecurityManager manager = System.getSecurityManager();
             final ThreadGroup group = manager == null ? Thread.currentThread().getThreadGroup() : manager.getThreadGroup();
             for( int i = 0; i < s_threads.length; i++ )
             {
-                Thread thread = s_threads[ i ];
+                Thread thread = s_threads[i];
                 if( thread == null || !thread.isAlive() )
                 {
-                    thread = s_threads[ i ] = new Thread( group, new TaskExecutor(), "ComputerCraft-Computer-Manager-" + s_ManagerCounter.getAndIncrement() );
+                    thread = s_threads[i] = new Thread( group, new TaskExecutor(), "ComputerCraft-Computer-Manager-" + s_ManagerCounter.getAndIncrement() );
                     thread.setDaemon( true );
                     thread.start();
                 }
@@ -251,8 +251,8 @@ public class ComputerThread
             {
                 long stop = System.nanoTime();
                 Computer computer = task.getOwner();
-                if( computer != null ) Tracking.addTiming( computer, stop - start );
-                
+                if( computer != null ) Tracking.addTaskTiming( computer, stop - start );
+
                 // Re-add it back onto the queue or remove it
                 synchronized( s_taskLock )
                 {

src/main/java/dan200/computercraft/core/computer/MainThread.java

@@ -6,14 +6,17 @@
 
 package dan200.computercraft.core.computer;
 
-import java.util.LinkedList;
+import dan200.computercraft.core.tracking.Tracking;
+
+import java.util.ArrayDeque;
+import java.util.Queue;
 
 public class MainThread
 {
     private static final int MAX_TASKS_PER_TICK = 1000;
     private static final int MAX_TASKS_TOTAL = 50000;
 
-    private static final LinkedList<ITask> m_outstandingTasks = new LinkedList<>();
+    private static final Queue<ITask> m_outstandingTasks = new ArrayDeque<>();
     private static final Object m_nextUnusedTaskIDLock = new Object();
     private static long m_nextUnusedTaskID = 0;
 
@@ -31,7 +34,7 @@ public class MainThread
         {
             if( m_outstandingTasks.size() < MAX_TASKS_TOTAL )
             {
-                m_outstandingTasks.addLast( task );
+                m_outstandingTasks.offer( task );
                 return true;
             }
         }
@@ -46,14 +49,17 @@ public class MainThread
             ITask task = null;
             synchronized( m_outstandingTasks )
             {
-                if( m_outstandingTasks.size() > 0 )
-                {
-                    task = m_outstandingTasks.removeFirst();
-                }
+                task = m_outstandingTasks.poll();
             }
             if( task != null )
             {
+                long start = System.nanoTime();
                 task.execute();
+
+                long stop = System.nanoTime();
+                Computer computer = task.getOwner();
+                if( computer != null ) Tracking.addServerTiming( computer, stop - start );
+
                 ++tasksThisTick;
             }
             else

src/main/java/dan200/computercraft/core/tracking/ComputerTracker.java

@@ -15,6 +15,9 @@ public class ComputerTracker
     private long totalTime;
     private long maxTime;
 
+    private long serverCount;
+    private long serverTime;
+
     private final TObjectLongHashMap<TrackingField> fields;
 
     public ComputerTracker( Computer computer )
@@ -32,10 +35,13 @@ public class ComputerTracker
         this.tasks = timings.tasks;
         this.totalTime = timings.totalTime;
         this.maxTime = timings.maxTime;
+
+        this.serverCount = timings.serverCount;
+        this.serverTime = timings.serverTime;
+
         this.fields = new TObjectLongHashMap<>( timings.fields );
     }
 
-
     @Nullable
     public Computer getComputer()
     {
@@ -67,13 +73,19 @@ public class ComputerTracker
         return totalTime / tasks;
     }
 
-    void addTiming( long time )
+    void addTaskTiming( long time )
     {
         tasks++;
         totalTime += time;
         if( time > maxTime ) maxTime = time;
     }
 
+    void addMainTiming( long time )
+    {
+        serverCount++;
+        serverTime += time;
+    }
+
     void addValue( TrackingField field, long change )
     {
         synchronized( fields )
@@ -89,6 +101,9 @@ public class ComputerTracker
         if( field == TrackingField.TOTAL_TIME ) return totalTime;
         if( field == TrackingField.AVERAGE_TIME ) return totalTime / tasks;
 
+        if( field == TrackingField.SERVER_COUNT ) return serverCount;
+        if( field == TrackingField.SERVER_TIME ) return serverTime;
+
         synchronized( fields )
         {
             return fields.get( field );

src/main/java/dan200/computercraft/core/tracking/Tracker.java

@@ -4,7 +4,46 @@ import dan200.computercraft.core.computer.Computer;
 
 public interface Tracker
 {
-    void addTiming( Computer computer, long time );
+    @Deprecated
+    default void addTiming( Computer computer, long time )
+    {
+    }
 
-    void addValue( Computer computer, TrackingField field, long change );
+    /**
+     * Report how long a task executed on the computer thread took.
+     *
+     * Computer thread tasks include events or a computer being turned on/off.
+     *
+     * @param computer The computer processing this task
+     * @param time     The time taken for this task.
+     */
+    default void addTaskTiming( Computer computer, long time )
+    {
+        //noinspection deprecation
+        addTiming( computer, time );
+    }
+
+    /**
+     * Report how long a task executed on the server thread took.
+     *
+     * Server tasks include actions performed by peripherals.
+     *
+     * @param computer The computer processing this task
+     * @param time     The time taken for this task.
+     */
+    default void addServerTiming( Computer computer, long time )
+    {
+    }
+
+    /**
+     * Increment an arbitrary field by some value. Implementations may track how often this is called
+     * as well as the change, to compute some level of "average".
+     *
+     * @param computer The computer to increment
+     * @param field    The field to increment.
+     * @param change   The amount to increment said field by.
+     */
+    default void addValue( Computer computer, TrackingField field, long change )
+    {
+    }
 }

src/main/java/dan200/computercraft/core/tracking/Tracking.java

@@ -35,14 +35,25 @@ public class Tracking
         }
     }
 
-    public static void addTiming( Computer computer, long time )
+    public static void addTaskTiming( Computer computer, long time )
     {
         if( tracking.get() == 0 ) return;
 
         synchronized( contexts )
         {
-            for( TrackingContext context : contexts.values() ) context.addTiming( computer, time );
-            for( Tracker tracker : trackers ) tracker.addTiming( computer, time );
+            for( TrackingContext context : contexts.values() ) context.addTaskTiming( computer, time );
+            for( Tracker tracker : trackers ) tracker.addTaskTiming( computer, time );
+        }
+    }
+
+    public static void addServerTiming( Computer computer, long time )
+    {
+        if( tracking.get() == 0 ) return;
+
+        synchronized( contexts )
+        {
+            for( TrackingContext context : contexts.values() ) context.addServerTiming( computer, time );
+            for( Tracker tracker : trackers ) tracker.addServerTiming( computer, time );
         }
     }
 

src/main/java/dan200/computercraft/core/tracking/TrackingContext.java

@@ -14,7 +14,7 @@ import java.util.Map;
  * Note that this <em>will</em> track computers which have been deleted (hence
  * the presence of {@link #timingLookup} and {@link #timings}
  */
-public class TrackingContext
+public class TrackingContext implements Tracker
 {
     private boolean tracking = false;
 
@@ -52,7 +52,8 @@ public class TrackingContext
         return new ArrayList<>( timings );
     }
 
-    public void addTiming( Computer computer, long time )
+    @Override
+    public void addTaskTiming( Computer computer, long time )
     {
         if( !tracking ) return;
 
@@ -66,11 +67,31 @@ public class TrackingContext
                 timings.add( computerTimings );
             }
 
-            computerTimings.addTiming( time );
+            computerTimings.addTaskTiming( time );
         }
     }
 
-    public synchronized void addValue( Computer computer, TrackingField field, long change )
+    @Override
+    public void addServerTiming( Computer computer, long time )
+    {
+        if( !tracking ) return;
+
+        synchronized( this )
+        {
+            ComputerTracker computerTimings = timingLookup.get( computer );
+            if( computerTimings == null )
+            {
+                computerTimings = new ComputerTracker( computer );
+                timingLookup.put( computer, computerTimings );
+                timings.add( computerTimings );
+            }
+
+            computerTimings.addMainTiming( time );
+        }
+    }
+
+    @Override
+    public void addValue( Computer computer, TrackingField field, long change )
     {
         if( !tracking ) return;
 

src/main/java/dan200/computercraft/core/tracking/TrackingField.java

@@ -14,6 +14,9 @@ public class TrackingField
     public static final TrackingField AVERAGE_TIME = TrackingField.of( "average", "Average time", x -> String.format( "%4.1fms", x / 1e6 ) );
     public static final TrackingField MAX_TIME = TrackingField.of( "max", "Max time", x -> String.format( "%5.1fms", x / 1e6 ) );
 
+    public static final TrackingField SERVER_COUNT = TrackingField.of( "server_count", "Server task count", x -> String.format( "%4d", x ) );
+    public static final TrackingField SERVER_TIME = TrackingField.of( "server_time", "Server task time", x -> String.format( "%7.1fms", x / 1e6 ) );
+
     public static final TrackingField PERIPHERAL_OPS = TrackingField.of( "peripheral", "Peripheral calls", x -> String.format( "%6d", x ) );
     public static final TrackingField FS_OPS = TrackingField.of( "fs", "Filesystem operations", x -> String.format( "%6d", x ) );
     public static final TrackingField TURTLE_OPS = TrackingField.of( "turtle", "Turtle operations", x -> String.format( "%6d", x ) );