9582b6e8fd
This change implements the spanSet data structure which is based off of the gcSweepBuf data structure. While the general idea is the same (one has two of these which one switches between every GC cycle; one to push to and one to pop from), there are some key differences. Firstly, we never have a need to iterate over this data structure so delete numBlocks and block. Secondly, we want to be able to pop from the front of the structure concurrently with pushes to the back. As a result we need to maintain both a head and a tail and this change introduces an atomic headTail structure similar to the one used by sync.Pool. It also implements popfirst in a similar way. As a result of this headTail, we need to be able to explicitly reset the length, head, and tail when it goes empty at the end of sweep termination, so add a reset method. Updates #37487. Change-Id: I5b8ad290ec32d591e3c8c05e496c5627018074f6 Reviewed-on: https://go-review.googlesource.com/c/go/+/221181 Run-TryBot: Michael Knyszek <mknyszek@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com> |
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