C++ : How do I make a function thread safe in C++?

C++ : How do I make a function thread safe in C++?
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

So here is a secret hidden feature I promissed to tell you.
This is a YouTube's feature which works on Desktop.
First, Ensure that the video is playing before proceeding.
Then, type the letters 'awesome' on your keyboard as the next step.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

A short overview of who I am,
Hi there, I go by the name of Delphi.
Let me help you get the answers you need to your questions.
C++ : How do I make a function thread safe in C++?
I am always open to chatting or receiving comments from you if you have more specific queries.
If you have additional information or an answer to contribute, please feel free to comment below.
I will express my appreciation for your answer by 'hearting' it.
C++? thread How safe in a : function do C++ make I