tc/hdb: add exclusive mode, lock disabling

The :exclusive mode behaves like TokyoTyrant and keeps the
database opened in read-write mode, preventing other processes
from accessing the database.  This will be useful on Rubies
without a GVL.

:readonly no longer disables locking by default
instead "rdlock=false" must be passed in the query
parameter.  Write locks may also be disabled with
the "wrlock=false" query parameter.

1 files changed, 0 insertions, 1 deletions

diff --git a/lib/metropolis/tc/hdb/ro.rb b/lib/metropolis/tc/hdb/ro.rb
index fddd73c..62ededc 100644
--- a/lib/metropolis/tc/hdb/ro.rb
+++ b/lib/metropolis/tc/hdb/ro.rb
@@ -6,7 +6,6 @@ module Metropolis::TC::HDB::RO
   def self.extended(obj)
    obj.instance_eval do
       @wr_flags = nil
-      @rd_flags |= TokyoCabinet::HDB::ONOLCK
       @dbv.each { |(hdb, path)|
         hdb.open(path, @rd_flags) or ex!(:open, hdb)
       }