C++11 STL containers and thread safety

Question

I have trouble finding any up-to-date information on this.

Do C++11 versions of STL containers have some level of thread safety guaranteed?

I do expect that

Answer 1

I think STL containers offer the following basic thread-safety guarantee:

• simultaneous reads of the same object are OK

• simultaneous read/writes of different objects are OK

But you have to use some form of custom synchronization (e.g. critical section) if you want to do something different, like e.g. simultaneous writes on the same object.