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Posted to issues@commons.apache.org by "Phil Steitz (JIRA)" <ji...@apache.org> on 2011/02/01 01:49:28 UTC

[jira] Commented: (MATH-505) TestUtils is thread-hostile

    [ https://issues.apache.org/jira/browse/MATH-505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988978#comment-12988978 ] 

Phil Steitz commented on MATH-505:
----------------------------------

What fields, exactly?

> TestUtils is thread-hostile
> ---------------------------
>
>                 Key: MATH-505
>                 URL: https://issues.apache.org/jira/browse/MATH-505
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 1.2, 2.1
>            Reporter: Sebb
>
> TestUtils has several mutable static fields which are not synchronised, or volatile.
> If one of the fields is updated by thread A, there is no guarantee that thread B will see the full update - it may see a partially updated object.
> Furthermore, at least some of the static fields reference a mutable object, which can be changed whilst another thread is using it.
> As far as I can tell, this class must only ever be used by a single thread otherwise the results will be unpredictable.

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