Bug 258.
Obtain an access exclusive lock not an exclusive one.
A concurrent select statement does not seem to block
the exclusive lock (but does block the access exclusive one)
and will block the truncate.

Branch
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REL_2_1_STABLE

Details
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http://git.postgresql.org/gitweb?p=slony1-engine.git;a=commitdiff;h=22aa75fadbd462c99efd67043c8819760211b8f1

Modified Files
--------------
RELEASE                      |    1 +
src/backend/slony1_funcs.sql |    4 ++--
2 files changed, 3 insertions(+), 2 deletions(-)