Is it safe to do this volatile++ operation in WebSocketBuffer?

[omajid]

runtime/src/libraries/System.Net.HttpListener/src/System/Net/Windows/WebSockets/WebSocketBuffer.cs

Line 346 in 8d6e07d

_payloadOffset += bytesTransferred;

It looks like this class tries to stick to atomic operations, but this operation seems like it could store the wrong values in the presence of multiple threads.

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[stephentoub]

Looks fine to me. I'm not really sure why it's volatile in the first place.