diff -Nur activerecord-2.0.1.orig/lib/active_record/connection_adapters/sqlite_adapter.rb activerecord-2.0.1.sqlitethreads/lib/active_record/connection_adapters/sqlite_adapter.rb
--- activerecord-2.0.1.orig/lib/active_record/connection_adapters/sqlite_adapter.rb	2007-11-07 20:37:16.000000000 -0700
+++ activerecord-2.0.1.sqlitethreads/lib/active_record/connection_adapters/sqlite_adapter.rb	2008-08-14 17:25:04.000000000 -0600
@@ -72,6 +72,7 @@
     #
     # * <tt>:database</tt> -- Path to the database file.
     class SQLiteAdapter < AbstractAdapter
+			@@mutex = Mutex.new
       def adapter_name #:nodoc:
         'SQLite'
       end
@@ -129,7 +130,9 @@
       # DATABASE STATEMENTS ======================================
 
       def execute(sql, name = nil) #:nodoc:
-        catch_schema_changes { log(sql, name) { @connection.execute(sql) } }
+				@@mutex.synchronize do
+					catch_schema_changes { log(sql, name) { @connection.execute(sql) } }
+				end
       end
 
       def update_sql(sql, name = nil) #:nodoc: