.NET Core CoreFX Runtime Adaption Layer purpose

Question

I have been trying to find some more information on CoreFX part of .NET Core and mainly on the Runtime Adaption Layer. This adaption layer is mentioned on .NET Core diagrams (e.g. , but I did not found single description of purpose of this layer, so I would like to ask for explanation of this layer. Thank you.

Answer 1

If I get it right, Runtime Adaption Layer is known as Platform Adaptation (Abstraction) Layer (PAL).

According to .NET Core glossary

PAL provides an abstraction layer between the runtime and the operating system.

The implementation for BCL (CoreFX) apparently could be found here: https://github.com/dotnet/corefx/tree/master/src/Common/src/Interop

CoreCLR btw has its own PAL

https://github.com/dotnet/coreclr/tree/master/src/pal

https://github.com/dotnet/core-setup/blob/master/src/corehost/common/pal.h (corehost actually, not CLR)

Worth to mention (from here) that PAL has Win32 API syntax

The PAL exposes a collection of interfaces that are based on Win32