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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/awt/peer/gtk/GtkMainThread.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/awt/peer/gtk/GtkMainThread.java')
-rw-r--r-- | libjava/classpath/gnu/java/awt/peer/gtk/GtkMainThread.java | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/peer/gtk/GtkMainThread.java b/libjava/classpath/gnu/java/awt/peer/gtk/GtkMainThread.java new file mode 100644 index 000000000..0ee61df84 --- /dev/null +++ b/libjava/classpath/gnu/java/awt/peer/gtk/GtkMainThread.java @@ -0,0 +1,188 @@ +/* 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(); + } + } +} |