changes made after tupshins reconstruction

[org.ibex.core.git] / src / org / xwt / Scheduler.java

diff --git a/src/org/xwt/Scheduler.java b/src/org/xwt/Scheduler.java
index 55be6df..9e939a3 100644 (file)
--- a/src/org/xwt/Scheduler.java
+++ b/src/org/xwt/Scheduler.java
@@ -1,4 +1,4 @@
-// Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
+// Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
 package org.xwt;
 
 import java.util.*;
@@ -8,23 +8,39 @@ import org.xwt.util.*;
 /** Implements cooperative multitasking */
 public class Scheduler {
 
-    // FIXME: prepending events messes with keysate -- make a "no re-ordering" invariant?
-
     // Public API Exposed to org.xwt /////////////////////////////////////////////////
 
     private static Scheduler singleton;
     public static interface Task { public abstract void perform() throws Exception; }
-
-    /** adds a task to the back of the queue */
     public static void add(Task t) { singleton.runnable.append(t); }
-
-    /** adds a task to the front of the queue (guaranteed to run next) */
-    public static void addAtFront(Task t) { singleton.runnable.prepend(t); }
-
     public static void init() { if (singleton == null) (singleton = Platform.getScheduler()).run(); }
 
     private static Task current = null;
-    public static Task current() { return current; }
+
+    private static volatile boolean rendering = false;
+    private static volatile boolean again = false;
+
+    /** synchronizd so that we can safely call it from an event-delivery thread, in-context */
+    public static void renderAll() {
+        if (rendering) { again = true; return; }
+        synchronized(Scheduler.class) {
+            try {
+                rendering = true;
+                do {
+                    // FEATURE: this could be cleaner
+                    again = false;
+                    for(int i=0; i<Surface.allSurfaces.size(); i++) {
+                        Surface s = ((Surface)Surface.allSurfaces.elementAt(i));
+                        do { s.render(); } while(s.abort);
+                    }
+                } while(again);
+            } finally {
+                rendering = false;
+            }
+        }
+    }
+
+    
 
     // API which must be supported by subclasses /////////////////////////////////////
 
@@ -45,24 +61,28 @@ public class Scheduler {
         while(true) {
             current = (Task)runnable.remove(true);
             try {
-                for(int i=0; i<Surface.allSurfaces.size(); i++) {
-                    Surface s = (Surface)Surface.allSurfaces.elementAt(i);
-                    if (current instanceof JSFunction) {
-                        s._mousex = Integer.MAX_VALUE;
-                        s._mousey = Integer.MAX_VALUE;
-                    } else {
-                        s._mousex = s.mousex;
-                        s._mousey = s.mousey;
+                // FIXME hideous
+                synchronized(this) {
+                    for(int i=0; i<Surface.allSurfaces.size(); i++) {
+                        Surface s = (Surface)Surface.allSurfaces.elementAt(i);
+                        if (current instanceof JS) {
+                            s._mousex = Integer.MAX_VALUE;
+                            s._mousey = Integer.MAX_VALUE;
+                        } else {
+                            s._mousex = s.mousex;
+                            s._mousey = s.mousey;
+                        }
                     }
+                    current.perform();
                 }
-                current.perform();
-                if (runnable.size() == 0 && Surface.needRender) Surface.renderAll.perform();
+                renderAll();
             } catch (JSExn e) {
-                Log.log(Scheduler.class, "a JavaScript thread spawned with xwt.thread() threw an exception:");
-                Log.log(Scheduler.class, e.toString());
+                Log.info(Scheduler.class, "a JavaScript thread spawned with xwt.thread() threw an exception:");
+                Log.info(Scheduler.class, "JS Exception: " + e.getObject() + "\n" + e.backtrace());
+                Log.info(Scheduler.class,e);
             } catch (Exception e) {
-                Log.log(Scheduler.class, "a Task threw an exception which was caught by the scheduler:");
-                Log.log(Scheduler.class, e);
+                Log.info(Scheduler.class, "a Task threw an exception which was caught by the scheduler:");
+                Log.info(Scheduler.class, e);
             }
             // if an Error is thrown it will cause the engine to quit
         }