Re: updating an ImageIcon's backing BufferedImage content from multiple
threads
Knute Johnson wrote:
For example, draw on a BufferedImage in a worker thread, and then
display that BufferedImage by calling repaint(). That would change
pixels in one thread and display in the EDT.
I worry that the change to the BI in one thread is not necessarily visible to
the other unless you synchronize the accesses to the BI.
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
That fuels my concern.
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.
Never having seen the bug is not proof that it is not lurking. Sun went for
many years thinking that one could construct GUIs off the EDT and then use
them on the EDT, but now admit that was wrong. Those bugs were not observed
for a long, long time.
--
Lew