Use an isolated clone of the Session in workunit handlers to shield against cancellation#11721

Merged

stuhood merged 2 commits intopantsbuild:masterfrom stuhood:stuhood/shallow-session-clone

Mar 17, 2021

+136-63

Commits on Mar 17, 2021

Split InnerSession into SessionState and SessionHandle.
stuhood
committed
Add a isolated_shallow_clone for use when a background thread should be associated with a Session but not canceled by it.
stuhood
committed