Multithreading can be hard to do right. The most common point of failure is assuming some code is thread safe when it actually is not. And then the whole multithreading castle crumbles into ruins.

Multithreading can be hard to do right. The most common point of failure is assuming some code is thread safe when it actually is not. And then the whole multithreading castle crumbles into ruins.
http://dalijap.blogspot.com/2017/12/is-it-thread-safe-assume-not.html