Multithreading: simultaneous read/write?

[DrZoidberg]

I'm rewriting a console app to include a GUI. The original was single-threaded, so this inevitably introduces a bunch of data races. When an address is written to and read from concurrently, will the write operation complete normally?

I wouldn't mind having an incorrect value displayed every few billion iterations, but I'd rather not risk data getting corrupted.

[coder777]

To ensure that the pointer is valid across the threads make the pointer atomic:

http://www.cplusplus.com/reference/atomic/atomic/?kw=atomic

There might be even no time overhead if the processor instruction is alread atomic.

However you must ensure the any shared data is protected in case of simultaneous read a write.