[tlb]

std::shared_ptr doesn't use mutexes in any implementation I know of. They use atomic instructions for incrementing and decrementing the reference count, which are very fast.

[intelVISA]

Plus their thread-safety is limited to the pointer's control block not the actual object it's pointing to.

e: nvm reading hard brain mutex too slow

[another_another]

You're right, an atomic inc/dec would also do just fine. I stand corrected.