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mtklein authored
There's a small window where two threads can both see the gen ID is zero, both go get new distinct genIDs, but race to write them. This now uses compare_exchange to read and leave the winner's ID in place when there's a race. SkAtomics isn't public. TBR=reed@google.com BUG=skia: Review URL: https://codereview.chromium.org/956013002
59c92033
