A question about synchronization in Derby

[Raymond Raymond <ra...@hotmail.com>]

Today, when I read the source code of 
org.apache.derby.impl.store.raw.data.CachedPage.java,

I found some synchronized code like:



public boolean isDirty()    {

    synchronized (this)  {

        return isDirty || preDirty;

    }

}



public boolean isActuallyDirty() {

    synchronized (this) {

        return isDirty;

    }

}



I have two questions about them, hope someone can answer me:

1. Is it necessary to synchronize the code in these places?

2. I saw someone else commented on some code (in derby) said it's not

    good to return from inside of a synchronized block. What potential 
problem

    it will cause if return from inside of a synchronized block?





Raymond

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