123     mutex_.Lock();  in SyncClosedLogs()
627   mutex_.Lock();  in NotifyOnFlushBegin()
668   mutex_.Lock();  in NotifyOnFlushCompleted()
705       mutex_.Lock();  in CompactRange()
1051   mutex_.Lock();  in CompactFilesImpl()
1208   mutex_.Lock();  in NotifyOnCompactionBegin()
1247   mutex_.Lock();  in NotifyOnCompactionCompleted()
2316       mutex_.Lock();  in BackgroundCallFlush()
2341       mutex_.Lock();  in BackgroundCallFlush()
2389       mutex_.Lock();  in BackgroundCallCompaction()
2407       mutex_.Lock();  in BackgroundCallCompaction()
2440       mutex_.Lock();  in BackgroundCallCompaction()
2837     mutex_.Lock();  in BackgroundCompaction()