[Zodb-checkins] CVS: ZODB3 - NEWS.txt:1.33.6.23

[Tim Peters]

Update of /cvs-repository/ZODB3
In directory cvs.zope.org:/tmp/cvs-serv18521

Modified Files:
      Tag: Zope-2_7-branch
	NEWS.txt 
Log Message:
News about a bugfix that hasn't been checked in yet (waiting for the
Zope 2.7 tests to complete).


=== ZODB3/NEWS.txt 1.33.6.22 => 1.33.6.23 ===
--- ZODB3/NEWS.txt:1.33.6.22	Fri May 21 13:47:24 2004
+++ ZODB3/NEWS.txt	Fri May 21 18:09:43 2004
@@ -5,6 +5,14 @@
 ZODB
 ----
 
+Under exceedingly unlikely conditions, it was possible for DB.open()
+to block with as few as two threads active.  This was revealed by the
+intermittent failure of the checkConcurrentUpdates1Storage test on a
+hyper-threaded 3.2GHz P4 machine.  That test has never been reported
+to fail elsewhere, and didn't fail on that box either if hyper-threading
+was disabled in the BIOS.  It was a legitimate thread race, but without
+hyper-threading it was extremely unlikely to happen.
+
 Collector #1330:  repozo.py -R can create corrupt .fs.
 When looking for the backup files needed to recreate a Data.fs file,
 repozo could (unintentionally) include its meta .dat files in the list,