I use TEventLog component to debug my application, log all steps in order to fully verify that is working properly.
Is TEventLog thread safe, I am writing from multiple threads using the same instance of TEventLog. Is it wrong, should I use critical sections when writting ?
I don't think it is thread safe. I don't see anything done for it. Moreover it is a TComponent, and most tcomponents are for designtime use and not threadsafe.
So yes, probably you must serialize yousrself.