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Groups > comp.lang.java.gui > #5172

Re: a tight game loop in Swing

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On 6/6/12 11:58 PM, Lew wrote:
> Knute Johnson wrote:
>> Lew wrote:
>>> John B. Matthews wrote:
>>>> This reminds of an example adduced by Knute Johnson:
>>>>
>>>> <https://groups.google.com/d/msg/comp.lang.java.gui/aBy_DZFvg2M/-T9aWOwBM-QJ>
>>>>
>>>
>>> Ten points for using the word "adduced".
>>>
>>> There are some EDT violations in the cited code's 'main()' routine.
>>>
>>
>> Here's the updated code with that fixed.
>>
>> import java.awt.*;
>> import java.awt.event.*;
>> import java.awt.geom.*;
>> import java.awt.image.*;
>> import java.lang.reflect.*;
>> import javax.swing.*;
>>
>> public class test3 extends JPanel implements Runnable {
>> volatile BufferedImage bi;
>> volatile long then;
>
> I am curious what motivated the choice of 'volatile'.
>
> In my own case I will sometimes speculatively use 'volatile' to mark
> fields not essential to state despite that the class does not implement
> 'Serializable'. While this violates the rigid rule prohibiting
> superfluity, I aver that the marker aids reasoning about the state in
> such cases.
>
> This doesn't seem to be that.
>
Volatile has nothing to do with Serializable. Perhaps you're having a 
moment of confusing volatile with transient?  Volatile is necessary when 
you want to force a happens-before relationship to reads/writes to a 
field.  It also guarantees the you won't have a situation where writes 
aren't flushed to main memory before the next attempted read.

In other words, it is one safe way to publish a value across threads.

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Re: a tight game loop in Swing "John B. Matthews" <nospam@nospam.invalid> - 2012-06-04 11:01 -0400
  Re: a tight game loop in Swing Lew <lewbloch@gmail.com> - 2012-06-04 16:39 -0700
    Re: a tight game loop in Swing Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2012-06-05 21:51 -0700
      Re: a tight game loop in Swing Lew <noone@lewscanon.com> - 2012-06-06 23:58 -0700
        Re: a tight game loop in Swing Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-07 09:20 -0700
          Re: a tight game loop in Swing Lew <lewbloch@gmail.com> - 2012-06-08 12:28 -0700
      Re: a tight game loop in Swing Lew <noone@lewscanon.com> - 2012-06-07 00:36 -0700

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