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SWT issue with syncExec()


By : Sandeep
Date : October 16 2020, 11:12 AM
To fix this issue There are two methods in SWT Display class, syncExec and aSyncExec. They are both used when you have a thread that is not the UI thread that wants to update the UI in some way. Basically when you call them you are basically saying to the UI thread that you have something you want it to do when it gets a chance. So the UI thread will continue its current work and at some point it will do what you asked it to do. When it does it will always vary depending on what other work the UI thread has to do at that time.
The difference between aSyncExec and syncExec is whether or not the code that calls it waits for the execution to finish. If you call aSyncExec then the execution of the next statement in your calling thread will execute immediately. If you call syncExec then your calling thread will sit and wait until the UI Thread actually executes the code and returns. By timing how long it takes to execute syncExec you are therefore timing not just how long it takes the run method to execute, but also how long before the UI thread actaully starts running it.
code :


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What's the best way to return variables from a syncExec?


By : traderde
Date : March 29 2020, 07:55 AM
I hope this helps you . ArrayList is not thread-safe. You can obtain a thread-safe List with Collections.synchronizedList. However, it is much simpler to use an AtomicInteger in your case or AtomicReference in a more general case.
code :
final AtomicInteger resultAtomicInteger = new AtomicInteger();
Display.getCurrent().syncExec(new Runnable() { 
    public void run() {
        MessageBox mb = /* ... */;
            /* set up messagebox */
        resultAtomicInteger.set(mb.open());
}});
if (SWT.OK == resultAtomicInteger.get()) { /* ... */ }

Java SWT: wrapping syncExec and asyncExec to clean up code


By : Tom Potter
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I had a similar problem in my SWT code.
I wrote a base class that had nothing but asyncExec and syncExec methods. I had a method for every GUI method I wanted to call.

Is drawing new elements within (a)syncExec impossible?


By : Fredrick Roberts
Date : March 29 2020, 07:55 AM
it helps some times I don't know if that's the only problem but you have to at least relayout the composite and its children. Otherwise the label will just have a size of 0 and will therefore not be visible. You typically do this by calling composite.layout(). Unless the composite doesn't have a layout manager; then you would have to manually set its bounds.

Difference between syncExec() and asyncExec() of Display class


By : Gemini
Date : March 29 2020, 07:55 AM

Difference between invokeLater/invokeAndWait and asyncExec/syncExec


By : Maung Maung
Date : March 29 2020, 07:55 AM
it should still fix some issue Eclipse uses the SWT User Interface, this is a completely separate UI system from Swing. asyncExec()/syncExec() are part of the SWT system.
If you are writing an Eclipse RCP or plug-ins for Eclipse you should be writing SWT code.
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