Class GtkMainThread

Implemented Interfaces:

public class GtkMainThread
extends Thread

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 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).

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

Thread.State, Thread.UncaughtExceptionHandler

Field Summary

static GtkMainThread
The main thread instance (singleton)

Fields inherited from class java.lang.Thread


Method Summary

static void
static void
The method of Thread that will be run if there is no Runnable object associated with the Thread.

Methods inherited from class java.lang.Thread

StackTraceElement[]> getAllStackTraces, activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, run, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details


public static GtkMainThread mainThread
The main thread instance (singleton)

Method Details


public static void createWindow()


public static void destroyWindow()


public void run()
The method of Thread that will be run if there is no Runnable object associated with the Thread. Thread's implementation does nothing at all.
Specified by:
run in interface Runnable
run in interface Thread -- 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.