tree a72a84591540a4a92889472a80f5029c9d9a07a1
parent b9b554e0f68726b19274209ea6ce910b7e9f5fbf
author Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1596475693 -0300
committer Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1596475693 -0300

Threads don't need to always go to 'grayagain'

In incremental mode, threads don't need to be visited again once
visited in the atomic phase. In generational mode (where all visits
are in the atomic phase), only old threads need to be kept in the
'grayagain' list for the next cycle.