Race condition when auto-sweep is started
-----------------------------------------
Key: CORE-4134
URL: http://tracker.firebirdsql.org/browse/CORE-4134
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 2.5.2, 3.0 Initial
Reporter: Vlad Khorsun
When concurrent transactions detects sweep condition and starts an asyncronous
sweep process there is race condition present which could lead to the unneeded
effects:
- a lot of sweep threads could be started (and perform attach\detach calls)
- in SS concurrent sweep threads could be serialized inside isc_attach_database
and then run sequentially few times a whole sweep process
- a lot of threads could lead to out of memory condition, especially at 32-bit
process
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