How is the correct way of passing constant / uniform variables to a Compute Shader in Unity?

So, my question is pretty much what the title says: in the Compute Shaders in Unity, what is the correct way of having constant/uniform/global variables?

Compute shader do not accept the definition 'uniform' and in the official documentation (http://docs.unity3d.com/Manual/SL-BuiltinMacros.html), there is only a sparse mention of the format:

Code (CSharp):

1. CBUFFER_START(MyRarelyUpdatedVariables)
2. float4 _SomeGlobalValue;
3. CBUFFER_END

However, that gives me the error "unrecognized identifier "CBUFFER_STAR'". What is exactly the correct way of having variables that are passed by C# and behave as global constant variables in the Compute Shader?

PS: I did find a past question about that in the forum, but it didn't get any answers: http://forum.unity3d.com/threads/cbuffer-and-compute-shader.164968/

 

dx metal
cbuffer name{
}