Thread Safety of log4net

Question

There seems to be some discussion on whether log4net is thread-safe, the consensus is that the framework is thread-safe, but appenders are not and need to be used correctly to achieve thread-safety. can someone shine some light on this and possibly give example of lets say RollingFileAppender used in a thread-safe way? does it need to be pushed into context? somehow locked, or what?

Answer 1

According to this link, RollingFileAppender is thread safe (as far as logging is concerned). This is coming from one of the developers of log4net. He specifically says that locking like this is not required in your code:

lock(logger) {   logger.Info("Hello!"); }