Re: updating an ImageIcon's backing BufferedImage content from multiple
threads
Lew wrote:
Knute Johnson wrote:
However if you draw on a BufferedImage in one thread and display it in
the another (e.g. the EDT), I have never seen it fail to work even
without synchronization.
On a multi-processor machine?
So I think the answer to your question is that it will work fine but
I'm not exactly sure why.
Seems unsafe.
Lew:
Think of all the cases where you draw something to a BufferedImage in
one thread and then call repaint(). I've never seen a problem with
that. There may very well be some synchronization in the queue between
the call to repaint() and the calls to paintComponent() et al however.
On the other hand, I've never seen a case where a change was not visible
from one thread to another. I know that there is no guarantee that it
will be so but I have never seen a case of it with Sun's JVM. It is not
required to be invisible, it just may be. I would really like to be
able to create a program that could demonstrate a lack of visibility
across threads.
In any case the OPs problem is easily solved by synchronizing access to
the data.
--
Knute Johnson
email s/nospam/knute2009/
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