[jira] Resolved: (POOL-158) References to GenericKeyedObjectPool._minIdle are not always synchronized

["Phil Steitz (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/POOL-158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Phil Steitz resolved POOL-158.
------------------------------

    Resolution: Fixed

After looking carefully at the code, I concluded that making the field volatile is a better solution.  For the evict() read, there is no other reason to acquire a pool lock in the initial check. 

> References to GenericKeyedObjectPool._minIdle are not always synchronized
> -------------------------------------------------------------------------
>
>                 Key: POOL-158
>                 URL: https://issues.apache.org/jira/browse/POOL-158
>             Project: Commons Pool
>          Issue Type: Bug
>    Affects Versions: 1.2, 1.4, 1.5, 1.5.1, 1.5.2, 1.5.3, 1.5.4
>            Reporter: Sebb
>             Fix For: 1.5.5
>
>
> References to GenericKeyedObjectPool._minIdle are not always synchronized:
> The ensureMinIdle() and evict() methods both access the field outside the synch. block.
> This is particularly bad as they are called from the timer thread.
> The references could use getMinIdle(), which is synch., or it would probably be cheaper to move the references into the synch. blocks.
> Better yet, can the field be made final? setMinIdle() is currently only called from Test cases and setConfig() which is not referenced AFAICT.

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