[jira] Resolved: (HARMONY-2264) [drlvm] race condition in ClassLoader::LookupLoader

["Alexey Varlamov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-2264?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexey Varlamov resolved HARMONY-2264.
--------------------------------------

    Resolution: Fixed

Applied the fix at r504541

> [drlvm] race condition in ClassLoader::LookupLoader
> ---------------------------------------------------
>
>                 Key: HARMONY-2264
>                 URL: https://issues.apache.org/jira/browse/HARMONY-2264
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Alexey Varlamov
>         Assigned To: Alexey Varlamov
>            Priority: Minor
>         Attachments: H2264.patch
>
>
> The ClassLoader::LookupLoader() can potentially create duplicate native structures for the same Java classloader instance.
> ClassLoader* ClassLoader::LookupLoader( ManagedObject* loader )
> {
>     if( !loader ) return NULL;
>     ClassLoader *cl = FindByObject( loader );
>     if( cl )
>         return cl;
>     else
>         return AddClassLoader( loader );
> }
> It is possible that concurrent threads request this method simultaneously and AddClassLoader can be called several times for the same loader instance.
> BTW, It seems more logical and clean to declare this method (and a bunch of other static methods re Java-native loaders mapping) in UserDefinedClassLoader class, rather than in common ClassLoader.

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