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https://issues.apache.org/jira/browse/DIRMINA-183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Emmanuel Lecharny closed DIRMINA-183.
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> Use of "Double-Checked Locking" in ThreadPoolFilter
> ---------------------------------------------------
>
> Key: DIRMINA-183
> URL: https://issues.apache.org/jira/browse/DIRMINA-183
> Project: MINA
> Issue Type: Bug
> Reporter: peter royal
> Assignee: Trustin Lee
> Fix For: 0.9.3
>
>
> In ThreadPoolFilter, the Double-Checked Locking pattern is used:
> SessionBuffer buf = ( SessionBuffer ) buffers.get( session );
> if( buf == null )
> {
> synchronized( buffers )
> {
> buf = ( SessionBuffer ) buffers.get( session );
> if( buf == null )
> {
> buf = new SessionBuffer( session );
> buffers.put( session, buf );
> }
> }
> }
> .. this could lead to problems on multi-CPU systems
> (http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html)
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