Why does FGenericPlatformMisc::MemoryBarrier() just have a empty implementation?

Development Programming & Scripting
1

I’ve just started reading UE4’s source code (for fun:)). and when I came across the FPlatformMisc::MemoryBarrier() and tried to trace into the implementations for each platform, I found this:

void FGenericPlatformMisc::MemoryBarrier()
{
}

Why? Am I missing any things? or MemoryBarrier is just not needed on Windows platform?

I also find this , but I think it’s not the case.

2

Each platform implementations have their version of these function, see e.g. Engine\Source\Runtime\Core\Public\Linux\LinuxPlatformMisc.h

As to why windows doesn’t have implementation of this. Hard to say, maybe it’s not needed on this platform due to some guarantees of windows platform that make this redundant.

3

Thank you very much for answering. Yes, I did find those implementations for OSX, Linux, etc.
I think I’ll try to figure out the answer about empty implementation for Windows by searching the MSDN.