Enabling Glass thread checks
Hello, OpenJFX. FX is a single threaded UI toolkit. Glass (the underlying native window toolkit portability layer for FX) is being changed to ensure it is accessed from the UI thread. You can follow progress in https://javafx-jira.kenai.com/browse/RT-26891 We are reenabling the Glass thread checks ones again. Previous attempts failed, because we've been finding some threading issues, however now all the threading issues have been fixed and we are in a good state to switch on the checks again. The following exception would mean that you've hit a thread check: IllegalStateException(This operation is permitted on the event thread only). In that case please check your threading and if everything seems correct - please contact the Glass team. Thank you. With best regards. Petr.
RE: Enabling Glass thread checks
IllegalStateException(This operation is permitted on the event thread only) What is the event thread? Current warnings about thread rule violations appear to be something like below (from: http://stackoverflow.com/questions/12182592/javafx-2-x-swing-not-on-fx-application-thread): Exception in thread AWT-EventQueue-0 java.lang.IllegalStateException: Not on FX application thread; currentThread = AWT-EventQueue-0 It is very confusing if warnings about what thread you should be on might use different names for what is perhaps the same thing. If I do System.out.println(Thread.currentThread().getName()); in a start() method, I get: JavaFX Application Thread The JavaFX Architecture overview (http://docs.oracle.com/javafx/2/architecture/jfxpub-architecture.htm#A1107438) only mentions these threads: JavaFX application thread: This is the primary thread used by JavaFX application developers. Any live scene, which is a scene that is part of a window, must be accessed from this thread. A scene graph can be created and manipulated in a background thread, but when its root node is attached to any live object in the scene, that scene graph must be accessed from the JavaFX application thread. This enables developers to create complex scene graphs on a background thread while keeping animations on 'live' scenes smooth and fast. The JavaFX application thread is a different thread from the Swing and AWT Event Dispatch Thread (EDT), so care must be taken when embedding JavaFX code into Swing applications. Prism render thread: This thread handles the rendering separately from the event dispatcher. It allows frame N to be rendered while frame N +1 is being processed. This ability to perform concurrent processing is a big advantage, especially on modern systems that have multiple processors. The Prism render thread may also have multiple rasterization threads that help off-load work that needs to be done in rendering. Media thread: This thread runs in the background and synchronizes the latest frames through the scene graph by using the JavaFX application thread. -Original Message- From: openjfx-dev-boun...@openjdk.java.net [mailto:openjfx-dev-boun...@openjdk.java.net] On Behalf Of Petr Pchelko Sent: Friday, October 04, 2013 1:40 AM To: OpenJFX list Subject: Enabling Glass thread checks Hello, OpenJFX. FX is a single threaded UI toolkit. Glass (the underlying native window toolkit portability layer for FX) is being changed to ensure it is accessed from the UI thread. You can follow progress in https://javafx-jira.kenai.com/browse/RT-26891 We are reenabling the Glass thread checks ones again. Previous attempts failed, because we've been finding some threading issues, however now all the threading issues have been fixed and we are in a good state to switch on the checks again. The following exception would mean that you've hit a thread check: IllegalStateException(This operation is permitted on the event thread only). In that case please check your threading and if everything seems correct - please contact the Glass team. Thank you. With best regards. Petr.
Re: Enabling Glass thread checks
It's the JavaFX Application Thread. We tend to use the term event thread and UI thread to indicate that the thread is a distinguished UI thread that processes operating system events by running an event loop. Steve On 04/10/2013 2:45 PM, John Smith wrote: IllegalStateException(This operation is permitted on the event thread only) What is the event thread? Current warnings about thread rule violations appear to be something like below (from: http://stackoverflow.com/questions/12182592/javafx-2-x-swing-not-on-fx-application-thread): Exception in thread AWT-EventQueue-0 java.lang.IllegalStateException: Not on FX application thread; currentThread = AWT-EventQueue-0 It is very confusing if warnings about what thread you should be on might use different names for what is perhaps the same thing. If I do System.out.println(Thread.currentThread().getName()); in a start() method, I get: JavaFX Application Thread The JavaFX Architecture overview (http://docs.oracle.com/javafx/2/architecture/jfxpub-architecture.htm#A1107438) only mentions these threads: JavaFX application thread: This is the primary thread used by JavaFX application developers. Any live scene, which is a scene that is part of a window, must be accessed from this thread. A scene graph can be created and manipulated in a background thread, but when its root node is attached to any live object in the scene, that scene graph must be accessed from the JavaFX application thread. This enables developers to create complex scene graphs on a background thread while keeping animations on 'live' scenes smooth and fast. The JavaFX application thread is a different thread from the Swing and AWT Event Dispatch Thread (EDT), so care must be taken when embedding JavaFX code into Swing applications. Prism render thread: This thread handles the rendering separately from the event dispatcher. It allows frame N to be rendered while frame N +1 is being processed. This ability to perform concurrent processing is a big advantage, especially on modern systems that have multiple processors. The Prism render thread may also have multiple rasterization threads that help off-load work that needs to be done in rendering. Media thread: This thread runs in the background and synchronizes the latest frames through the scene graph by using the JavaFX application thread. -Original Message- From: openjfx-dev-boun...@openjdk.java.net [mailto:openjfx-dev-boun...@openjdk.java.net] On Behalf Of Petr Pchelko Sent: Friday, October 04, 2013 1:40 AM To: OpenJFX list Subject: Enabling Glass thread checks Hello, OpenJFX. FX is a single threaded UI toolkit. Glass (the underlying native window toolkit portability layer for FX) is being changed to ensure it is accessed from the UI thread. You can follow progress in https://javafx-jira.kenai.com/browse/RT-26891 We are reenabling the Glass thread checks ones again. Previous attempts failed, because we've been finding some threading issues, however now all the threading issues have been fixed and we are in a good state to switch on the checks again. The following exception would mean that you've hit a thread check: IllegalStateException(This operation is permitted on the event thread only). In that case please check your threading and if everything seems correct - please contact the Glass team. Thank you. With best regards. Petr.
Re: Enabling Glass thread checks
We are BAD. It should really be FX Application Thread but the GUI, event nature of the thread is critical to what it is. That's why the terms keep getting added. Steve On 04/10/2013 3:36 PM, Richard Bair wrote: Ya, event thread, fx thread, ui thread, app thread, FX Application thread --- they're all the same thing. It would be better if we settled on one name. Richard On Oct 4, 2013, at 12:00 PM, steve.x.northo...@oracle.com wrote: It's the JavaFX Application Thread. We tend to use the term event thread and UI thread to indicate that the thread is a distinguished UI thread that processes operating system events by running an event loop. Steve On 04/10/2013 2:45 PM, John Smith wrote: IllegalStateException(This operation is permitted on the event thread only) What is the event thread? Current warnings about thread rule violations appear to be something like below (from: http://stackoverflow.com/questions/12182592/javafx-2-x-swing-not-on-fx-application-thread): Exception in thread AWT-EventQueue-0 java.lang.IllegalStateException: Not on FX application thread; currentThread = AWT-EventQueue-0 It is very confusing if warnings about what thread you should be on might use different names for what is perhaps the same thing. If I do System.out.println(Thread.currentThread().getName()); in a start() method, I get: JavaFX Application Thread The JavaFX Architecture overview (http://docs.oracle.com/javafx/2/architecture/jfxpub-architecture.htm#A1107438) only mentions these threads: JavaFX application thread: This is the primary thread used by JavaFX application developers. Any live scene, which is a scene that is part of a window, must be accessed from this thread. A scene graph can be created and manipulated in a background thread, but when its root node is attached to any live object in the scene, that scene graph must be accessed from the JavaFX application thread. This enables developers to create complex scene graphs on a background thread while keeping animations on 'live' scenes smooth and fast. The JavaFX application thread is a different thread from the Swing and AWT Event Dispatch Thread (EDT), so care must be taken when embedding JavaFX code into Swing applications. Prism render thread: This thread handles the rendering separately from the event dispatcher. It allows frame N to be rendered while frame N +1 is being processed. This ability to perform concurrent processing is a big advantage, especially on modern systems that have multiple processors. The Prism render thread may also have multiple rasterization threads that help off-load work that needs to be done in rendering. Media thread: This thread runs in the background and synchronizes the latest frames through the scene graph by using the JavaFX application thread. -Original Message- From: openjfx-dev-boun...@openjdk.java.net [mailto:openjfx-dev-boun...@openjdk.java.net] On Behalf Of Petr Pchelko Sent: Friday, October 04, 2013 1:40 AM To: OpenJFX list Subject: Enabling Glass thread checks Hello, OpenJFX. FX is a single threaded UI toolkit. Glass (the underlying native window toolkit portability layer for FX) is being changed to ensure it is accessed from the UI thread. You can follow progress in https://javafx-jira.kenai.com/browse/RT-26891 We are reenabling the Glass thread checks ones again. Previous attempts failed, because we've been finding some threading issues, however now all the threading issues have been fixed and we are in a good state to switch on the checks again. The following exception would mean that you've hit a thread check: IllegalStateException(This operation is permitted on the event thread only). In that case please check your threading and if everything seems correct - please contact the Glass team. Thank you. With best regards. Petr.
Re: Enabling Glass thread checks
I always disliked FX Application thread, which is why I don't use it. The FXAT or FAT are acronyms we ought to avoid. EDT was great for Swing because it was super short, but we don't want to reuse EDT because that would be confusing. Personally I tend to use FX Thread because it is clear that this is the thread for JavaFX (and as far as users of the toolkit goes, the only thread that matters). Oh well. On Oct 4, 2013, at 12:38 PM, steve.x.northo...@oracle.com wrote: We are BAD. It should really be FX Application Thread but the GUI, event nature of the thread is critical to what it is. That's why the terms keep getting added. Steve On 04/10/2013 3:36 PM, Richard Bair wrote: Ya, event thread, fx thread, ui thread, app thread, FX Application thread --- they're all the same thing. It would be better if we settled on one name. Richard On Oct 4, 2013, at 12:00 PM, steve.x.northo...@oracle.com wrote: It's the JavaFX Application Thread. We tend to use the term event thread and UI thread to indicate that the thread is a distinguished UI thread that processes operating system events by running an event loop. Steve On 04/10/2013 2:45 PM, John Smith wrote: IllegalStateException(This operation is permitted on the event thread only) What is the event thread? Current warnings about thread rule violations appear to be something like below (from: http://stackoverflow.com/questions/12182592/javafx-2-x-swing-not-on-fx-application-thread): Exception in thread AWT-EventQueue-0 java.lang.IllegalStateException: Not on FX application thread; currentThread = AWT-EventQueue-0 It is very confusing if warnings about what thread you should be on might use different names for what is perhaps the same thing. If I do System.out.println(Thread.currentThread().getName()); in a start() method, I get: JavaFX Application Thread The JavaFX Architecture overview (http://docs.oracle.com/javafx/2/architecture/jfxpub-architecture.htm#A1107438) only mentions these threads: JavaFX application thread: This is the primary thread used by JavaFX application developers. Any live scene, which is a scene that is part of a window, must be accessed from this thread. A scene graph can be created and manipulated in a background thread, but when its root node is attached to any live object in the scene, that scene graph must be accessed from the JavaFX application thread. This enables developers to create complex scene graphs on a background thread while keeping animations on 'live' scenes smooth and fast. The JavaFX application thread is a different thread from the Swing and AWT Event Dispatch Thread (EDT), so care must be taken when embedding JavaFX code into Swing applications. Prism render thread: This thread handles the rendering separately from the event dispatcher. It allows frame N to be rendered while frame N +1 is being processed. This ability to perform concurrent processing is a big advantage, especially on modern systems that have multiple processors. The Prism render thread may also have multiple rasterization threads that help off-load work that needs to be done in rendering. Media thread: This thread runs in the background and synchronizes the latest frames through the scene graph by using the JavaFX application thread. -Original Message- From: openjfx-dev-boun...@openjdk.java.net [mailto:openjfx-dev-boun...@openjdk.java.net] On Behalf Of Petr Pchelko Sent: Friday, October 04, 2013 1:40 AM To: OpenJFX list Subject: Enabling Glass thread checks Hello, OpenJFX. FX is a single threaded UI toolkit. Glass (the underlying native window toolkit portability layer for FX) is being changed to ensure it is accessed from the UI thread. You can follow progress in https://javafx-jira.kenai.com/browse/RT-26891 We are reenabling the Glass thread checks ones again. Previous attempts failed, because we've been finding some threading issues, however now all the threading issues have been fixed and we are in a good state to switch on the checks again. The following exception would mean that you've hit a thread check: IllegalStateException(This operation is permitted on the event thread only). In that case please check your threading and if everything seems correct - please contact the Glass team. Thank you. With best regards. Petr.
Re: Enabling Glass thread checks
+1 for FX Thread. -Thor On Oct 4, 2013, at 12:53 PM, Richard Bair wrote: I always disliked FX Application thread, which is why I don't use it. The FXAT or FAT are acronyms we ought to avoid. EDT was great for Swing because it was super short, but we don't want to reuse EDT because that would be confusing. Personally I tend to use FX Thread because it is clear that this is the thread for JavaFX (and as far as users of the toolkit goes, the only thread that matters). Oh well. On Oct 4, 2013, at 12:38 PM, steve.x.northo...@oracle.com wrote: We are BAD. It should really be FX Application Thread but the GUI, event nature of the thread is critical to what it is. That's why the terms keep getting added. Steve On 04/10/2013 3:36 PM, Richard Bair wrote: Ya, event thread, fx thread, ui thread, app thread, FX Application thread --- they're all the same thing. It would be better if we settled on one name. Richard On Oct 4, 2013, at 12:00 PM, steve.x.northo...@oracle.com wrote: It's the JavaFX Application Thread. We tend to use the term event thread and UI thread to indicate that the thread is a distinguished UI thread that processes operating system events by running an event loop. Steve On 04/10/2013 2:45 PM, John Smith wrote: IllegalStateException(This operation is permitted on the event thread only) What is the event thread? Current warnings about thread rule violations appear to be something like below (from: http://stackoverflow.com/questions/12182592/javafx-2-x-swing-not-on-fx-application-thread): Exception in thread AWT-EventQueue-0 java.lang.IllegalStateException: Not on FX application thread; currentThread = AWT-EventQueue-0 It is very confusing if warnings about what thread you should be on might use different names for what is perhaps the same thing. If I do System.out.println(Thread.currentThread().getName()); in a start() method, I get: JavaFX Application Thread The JavaFX Architecture overview (http://docs.oracle.com/javafx/2/architecture/jfxpub-architecture.htm#A1107438) only mentions these threads: JavaFX application thread: This is the primary thread used by JavaFX application developers. Any live scene, which is a scene that is part of a window, must be accessed from this thread. A scene graph can be created and manipulated in a background thread, but when its root node is attached to any live object in the scene, that scene graph must be accessed from the JavaFX application thread. This enables developers to create complex scene graphs on a background thread while keeping animations on 'live' scenes smooth and fast. The JavaFX application thread is a different thread from the Swing and AWT Event Dispatch Thread (EDT), so care must be taken when embedding JavaFX code into Swing applications. Prism render thread: This thread handles the rendering separately from the event dispatcher. It allows frame N to be rendered while frame N +1 is being processed. This ability to perform concurrent processing is a big advantage, especially on modern systems that have multiple processors. The Prism render thread may also have multiple rasterization threads that help off-load work that needs to be done in rendering. Media thread: This thread runs in the background and synchronizes the latest frames through the scene graph by using the JavaFX application thread. -Original Message- From: openjfx-dev-boun...@openjdk.java.net [mailto:openjfx-dev-boun...@openjdk.java.net] On Behalf Of Petr Pchelko Sent: Friday, October 04, 2013 1:40 AM To: OpenJFX list Subject: Enabling Glass thread checks Hello, OpenJFX. FX is a single threaded UI toolkit. Glass (the underlying native window toolkit portability layer for FX) is being changed to ensure it is accessed from the UI thread. You can follow progress in https://javafx-jira.kenai.com/browse/RT-26891 We are reenabling the Glass thread checks ones again. Previous attempts failed, because we've been finding some threading issues, however now all the threading issues have been fixed and we are in a good state to switch on the checks again. The following exception would mean that you've hit a thread check: IllegalStateException(This operation is permitted on the event thread only). In that case please check your threading and if everything seems correct - please contact the Glass team. Thank you. With best regards. Petr.
