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Posted to dev@xalan.apache.org by "Brian Minchau (JIRA)" <xa...@xml.apache.org> on 2006/10/17 18:14:35 UTC
[jira] Commented: (XALANJ-2321) Multi-threading problem with AVTs
[ http://issues.apache.org/jira/browse/XALANJ-2321?page=comments#action_12442958 ]
Brian Minchau commented on XALANJ-2321:
---------------------------------------
Per the JIRA triage meeting on Oct 16, 2005, Yash T. agreed to review the patch.
> Multi-threading problem with AVTs
> ---------------------------------
>
> Key: XALANJ-2321
> URL: http://issues.apache.org/jira/browse/XALANJ-2321
> Project: XalanJ2
> Issue Type: Bug
> Components: Xalan
> Environment: multi-processor systems
> Reporter: Erin Harris
> Attachments: AVT.patch
>
>
> The following code in AVT.java is causing problems for multi-threaded test cases:
> private final FastStringBuffer getBuffer(){
> if(USE_OBJECT_POOL){
> return StringBufferPool.get();
> }else if(m_cachedBuf == null){
> m_cachedBuf = new FastStringBuffer(INIT_BUFFER_CHUNK_BITS);
> return m_cachedBuf;
> }else if(m_cachedBuf.length() != 0){
> return new FastStringBuffer(INIT_BUFFER_CHUNK_BITS);
> }else{
> return m_cachedBuf;
> }
> }
> Because the same object node for the AVT is used by each thread, sometimes on one thread the buffer would be empty just as another thread is writing to it and thus both threads would write to the same buffer. This caused problems for a customer that used <xsl:element name="{local-name()}"> a lot and were running on a multi-processor machine.
> The suggested fix is to change the code to the following, and remove the m_cachedBuf field:
> private final FastStringBuffer getBuffer(){
> if(USE_OBJECT_POOL){
> return StringBufferPool.get();
> }else{
> return new FastStringBuffer(INIT_BUFFER_CHUNK_BITS);
> }
> }
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