Re: sync on local variable

From:

Roedy Green <see_website@mindprod.com.invalid>

Newsgroups:

comp.lang.java.programmer

Date:

Wed, 24 Mar 2010 17:42:02 -0700

Message-ID:

<52clq5ljso4ekn0v34ejmu0k1j7loe8a8l@4ax.com>

On Wed, 24 Mar 2010 15:55:30 -0700, markspace <nospam@nowhere.com>
wrote, quoted or indirectly quoted someone who said :

If you later export that local reference to another thread or object, it
should be fine. It's valid to synchronize on a object that some other
part of the system will see later.

I have a JTable. I get a row put it in a local variable and
synchronise on that. Does that not lock anyone else getting that
row, even if they have nothing to do with my local variable?

AppToWatch row;
synchronized ( ALL_ROWS )
                {
                row = ALL_ROWS.get( rowIndex );
                state = row.getState();
                }
....
  synchronized ( row )
                    {
                    url = row.getVersionURL();
                    marker = row.getMarker();
                    }
--
Roedy Green Canadian Mind Products
http://mindprod.com

Don?t worry about people stealing an idea; if it?s original, you?ll have to shove it down their throats.
~ Howard Aiken (born: 1900-03-08 died: 1973-03-14 at age: 73)