1 files changed, 188 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/awt/peer/gtk/GtkMainThread.java b/gcc-4.4.3/libjava/classpath/gnu/java/awt/peer/gtk/GtkMainThread.java
new file mode 100644
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+++ b/gcc-4.4.3/libjava/classpath/gnu/java/awt/peer/gtk/GtkMainThread.java
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+/* GtkMainThread.java -- Wrapper for the GTK main thread, and some utilities.
+   Copyright (C) 2006  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.awt.peer.gtk;
+
+import gnu.java.awt.peer.NativeEventLoopRunningEvent;
+
+/**
+ * The Java thread representing the native GTK main loop, that is,
+ * GtkMainThread.mainThread, terminates when GtkToolkit.gtkMain()
+ * returns.  That happens in response to the last window peer being
+ * disposed (see GtkWindowPeer.dispose).
+ *
+ * When GtkMainThread.destroyWindow is called for the last window, it
+ * in turn calls GtkMainThread.endMainThread, which calls gtk_quit.
+ * gtk_quit signals gtk_main to return, which causes GtkMainThread.run
+ * to return.
+ *
+ * There should only be one native GTK main loop running at any given
+ * time.  In order to safely start and stop the GTK main loop, we use
+ * a running flag and corresponding runningLock.  startMainThread will
+ * not return until the native GTK main loop has started, as confirmed
+ * by the native set_running_flag callback setting the running flag to
+ * true.  Without this protection, gtk_quit could be called before the
+ * main loop has actually started, which causes GTK assertion
+ * failures.  Likewise endMainThread will not return until the native
+ * GTK main loop has ended.
+ *
+ * post_running_flag_callback is called during gtk_main initialization
+ * and no window can be created before startMainThread returns.  This
+ * ensures that calling post_running_flag_callback is the first action
+ * taken by the native GTK main loop.
+ *
+ * GtkMainThread.mainThread is started when the window count goes from
+ * zero to one.
+ *
+ * GtkMainThread keeps the AWT event queue informed of its status by
+ * posting NativeEventLoopRunningEvents.  The AWT event queue uses
+ * this status to determine whether or not the AWT exit conditions
+ * have been met (see EventQueue.isShutdown).
+ */
+public class GtkMainThread extends Thread
+{
+  /** Count of the number of open windows */
+  private static int numberOfWindows = 0;
+
+  /** Lock for the above */
+  private static Object nWindowsLock = new Object();
+
+  /** Indicates whether or not the GTK main loop is running. */
+  private static boolean running = false;
+
+  /** Lock for the above. */
+  private static Object runningLock = new Object();
+
+  /** The main thread instance (singleton) */
+  public static GtkMainThread mainThread;
+
+  /** Constructs a main thread */
+  private GtkMainThread()
+  {
+    super("GTK main thread");
+  }
+
+  public void run ()
+  {
+    GtkToolkit.gtkMain ();
+  }
+
+  private static void setRunning(boolean running)
+  {
+    synchronized (runningLock)
+      {
+        GtkMainThread.running = running;
+        runningLock.notifyAll();
+      }
+  }
+
+  private static void startMainThread()
+  {
+    synchronized (runningLock)
+      {
+        if (!running)
+          {
+            mainThread = new GtkMainThread();
+            mainThread.start();
+
+            while (!running)
+              {
+                try
+                  {
+                    runningLock.wait();
+                  }
+                catch (InterruptedException e)
+                  {
+                    System.err.println ("GtkMainThread.startMainThread:"
+                                        + " interrupted while waiting "
+                                        + " for GTK main loop to start");
+                  }
+              }
+            GtkGenericPeer.q()
+              .postEvent(new NativeEventLoopRunningEvent(Boolean.TRUE));
+          }
+      }
+  }
+
+  private static void endMainThread()
+  {
+    synchronized (runningLock)
+      {
+        if (running)
+          {
+            GtkToolkit.gtkQuit();
+
+            while (running)
+              {
+                try
+                  {
+                    runningLock.wait();
+                  }
+                catch (InterruptedException e)
+                  {
+                    System.err.println ("GtkMainThread.endMainThread:"
+                                        + " interrupted while waiting "
+                                        + " for GTK main loop to stop");
+                  }
+              }
+            GtkGenericPeer.q()
+              .postEvent(new NativeEventLoopRunningEvent(Boolean.FALSE));
+            }
+      }
+  }
+
+  public static void createWindow()
+  {
+    synchronized (nWindowsLock)
+      {
+        if (numberOfWindows == 0)
+          startMainThread();
+        numberOfWindows++;
+      }
+  }
+
+  public static void destroyWindow()
+  {
+    synchronized (nWindowsLock)
+      {
+        numberOfWindows--;
+        if (numberOfWindows == 0)
+          endMainThread();
+      }
+  }
+}