# Thread Safety

Unless otherwise stated, the thread safety rules for the library are as follows:

- Two threads can invoke a method or function concurrently on different objects, but not the same object.

- It is unsafe for two threads to invoke concurrently methods or functions on the same object.

Descriptions of the classes note departures from this convention. For example, the concurrent containers are more liberal. By their nature, they do permit some concurrent operations on the same container object.

Parent topic: General Conventions