diff options
Diffstat (limited to 'src/jogl/classes/javax/media')
| -rw-r--r-- | src/jogl/classes/javax/media/opengl/awt/GLCanvas.java | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java b/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java index 604dea057..bdfa11959 100644 --- a/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java +++ b/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java @@ -132,6 +132,20 @@ import jogamp.opengl.GLDrawableHelper; * <ul> * <li><pre>sun.awt.noerasebackground=true</pre></li> * </ul> + * <p> + * FIXME: If this instance runs in multithreading mode, see {@link Threading#isSingleThreaded()} (default: single-thread), + * proper recursive locking is required for drawable/context @ destroy and display. + * Recreation etc could pull those instances while animating! + * Simply locking before using drawable/context offthread + * would allow a deadlock situation! + * </p> + * <p> + * NOTE: [MT-0] Methods utilizing [volatile] drawable/context are not synchronized. + In case any of the methods are called outside of a locked state + extra care should be added. Maybe we shall expose locking facilities to the user. + However, since the user shall stick to the GLEventListener model while utilizing + GLAutoDrawable implementations, she is safe due to the implicit locked state. + * </p> */ @SuppressWarnings("serial") @@ -141,8 +155,8 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing private final GLDrawableHelper drawableHelper = new GLDrawableHelper(); private AWTGraphicsConfiguration awtConfig; - private volatile GLDrawable drawable; - private GLContextImpl context; + private volatile GLDrawable drawable; // volatile avoids locking all accessors. FIXME still need to sync destroy/display + private volatile GLContextImpl context; // volatile avoids locking all accessors. FIXME still need to sync destroy/display private boolean sendReshape = false; // copy of the cstr args, mainly for recreation @@ -388,10 +402,7 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing @Override public boolean isRealized() { - return ( null != drawable ) ? drawable.isRealized() : false; - } - protected final boolean isRealizedImpl() { - return ( null != drawable ) ? drawable.isRealized() : false; + return (null != drawable) ? drawable.isRealized() : false; } @Override |