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https://issues.apache.org/jira/browse/LOGCXX-394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13899258#comment-13899258
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Thorsten Schöning commented on LOGCXX-394:
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The better approach should be to use Level::equals for comparison.
> Levels are not thread safe
> --------------------------
>
> Key: LOGCXX-394
> URL: https://issues.apache.org/jira/browse/LOGCXX-394
> Project: Log4cxx
> Issue Type: Bug
> Components: Appender
> Environment: Windows 7, Visual Studio 2010 SP1
> Reporter: Petro Protsyk
> Assignee: Thorsten Schöning
> Priority: Minor
> Labels: thread-safety
>
> Level.cpp. All default level variables are function static. This is not
> thread safe, especially in Visual C++ compiler.
> Here is code to reproduce the issue in VC++ 2010:
> Concurrency::parallel_for (int(0), int(10), [&](int i)
> {
> if (::log4cxx::Level::getWarn() == NULL)
> {
> throw std::exception();
> }
> });
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