CachePadded size and alignment about crossbeam

[arthurprs]

This looks like an easy fix. Any objections for making it 64 bytes ?

[jeehoonkang]

Actually we cannot make it 64 bytes -- Participant is used as an argument for CachePadded, but its size is bigger than 64. Only after generalizing CachePadded in such a way that it can serve types bigger than the cache line size, we can make it 64 bytes.

Note that we can make it 128 bytes.

[arthurprs]

Could we implement the methods for arrays of cache padding (multiples of 64 bytes but still holding a single T)?

[jeehoonkang]

@arthurprs currently we cannot. See #6 (comment) .

[arthurprs]

Providing implementations (using macros) for [CachePadding; $$$] up to 4 (256 bytes) should be more than enough. Am I missing something?

[mstewartgallus]

Why not something along the lines of https://sstewartgallus.com/git?p=uevents-rs.git;a=blob;f=src/cacheline.rs;h=4b726636b02bdc2fbba4e1e7bc3912232864d2b2;hb=HEAD ?