STL queue - thread-safe for push/pop?

Question

C++ / C#

If push() of a new element is executed in one thread, and in another

if (!queue.empty()){
  element = queue.first();
  queue.pop();
}

do i need to use mutex or can push/pop be done without mutex?

Answer 1

All STL containers are not thread safe unless otherwise noted. The reason is simple - the inevitable loss of performance in cases where thread safety is not needed.
Remember C++ is made for the developer's freedom of choice. Take a break from this.

Answer 2

No, of course, if necessary, you can look at boost::lockfree or Intel TBB. Well, either close it yourself.