Will you explain what this would do?
Basically this removes the volatile keyword from your code and replaces it with... nothing.
If a variable is declared volatile, it disables compiler optimizations and signals the compiler that this variable can be modified at any time (e.g. by hardware or other threads). Omitting volatile can lead to nasty concurrency bugs (e.g. if the optimizer optimizes spin locks away). In the worst case, such bugs are extremely hard to reproduce (and thus debug) but lead to deadlocks and/or crashes in case they do occur.
So what is that? It's any kind of input. Like memory mapped GPIO.
In C and C++, volatile is not intended and must not be used for synchronisation primitives, it is not a memory fence (so it does not force cache coherency and does not prevent operations reordering) and operations on volatile variables are not atomic. Its primary use case is memory-mapped IO (with a sub-use case of preventing eliding memory operations affected by inline assembly). If a lock is broken because `volatile` is disabled, it's probably incorrect in the first place.
All `volatile` does[0] is forbid elision of loads and stores.
[0] again in C or C++, Java and C# have completely different semantics
Of course at this same company a developer insisted that if you use the mongoDB client libraries in your software, your software can never have data consistency problems.