Sam Brannen
bb7ea37f1b
Prior to this commit, clear() polled the eviction queue to remove entries and only afterward drained the pending write operations queue. Consequently, a put() whose AddTask had not yet been linked into the eviction queue -- for example, because it lost the race to self-drain while clear() held the eviction lock -- would only be applied by that trailing drain, linking the entry into the eviction queue right after clear() had already finished removing everything it could see. The practical effect was that an entry already fully added to the cache could still be present immediately after clear() returned, with no further concurrent activity required at that point. To address that, this commit revises clear() so that it drains the pending write operations queue before polling the eviction queue, so any write that was already queued gets cleaned up along with everything else. However, a put() that is genuinely concurrent with an in-progress clear() call can still survive, which is consistent with the cache's weak-consistency design. Thanks to @guanchengang for raising gh-37286, which prompted this fix. Closes gh-37287
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