Interview 1: 1. virtual functions, inheritance, etc..easy to answer c++ questions. Conversation was for about 20-25 minutes 2. Can't exactly recall, but it was about Binary Search Tree, pretty easy to find on the web. I think it was to do with levels in BST, I used recursion in the solution. Interviewer was happy with the solution. Overall call lasted for about 1 hour and 5 minutes including some questions I asked him. Interview 2: 1. What is mutex, semaphore? 2. What is a singleton pattern and can you write one that is thread-safe 3. Write a consumer producer problem. Producer produces 1000 objects and there are five consumers that consume 10 objects at a time in round robin fashion until all of them are consumed. This means that if consumer 1 consumes 10 objects, it has to wait for consumer 2, 3, 4, 5 to consume 10 objects each before it can consume other 10.