[LOGCXX-394] Levels are not thread safe - ASF JIRA

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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(); }

});

is duplicated by

LOGCXX-411 Crash when logging on multiple threads.

is related to

LOGCXX-322 Crashes on exit from multithreaded program using log4cxx

relates to

LOGCXX-430 LogManager::getRootLogger is not thread-safe

LOGCXX-485 Levels leak memory