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roots: correctly track crawl dirty state

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If there's an error while writing the crawl state, the state should
remain dirty.  If the crawl state is successfully written, the state
is only clean if there were no changes to crawl state since the write
was committed.  We need to release the lock while writing the state but
correctly set the dirty flag when the state is written successfully.

Replace the bool with a version number counter.  Track the last version
successfully saved and the current version of the crawl state.  The state
is dirty if these counters disagree and clean if they agree.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2022-11-26 23:16:13 -05:00
parent a9c81e5531
commit be9321cdb3
2 changed files with 13 additions and 10 deletions
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src/bees.h
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@ -544,7 +544,8 @@ class BeesRoots : public enable_shared_from_this<BeesRoots> {
BeesStringFile m_crawl_state_file;
map<uint64_t, shared_ptr<BeesCrawl>> m_root_crawl_map;
mutex m_mutex;
bool m_crawl_dirty = false;
uint64_t m_crawl_dirty = 0;
uint64_t m_crawl_clean = 0;
Timer m_crawl_timer;
BeesThread m_crawl_thread;
BeesThread m_writeback_thread;