             // >
             let s5 = DispatchSemaphore(value: 0)
             //                              SELECT COUNT(*) FROM items -> 1
-            //                              COMMIT
+            //                              }
             
             let block1 = { () in
                 do {

            let s2 = DispatchSemaphore(value: 0)
            // step                         step
            // step                         end
            // end                          COMMIT
            // COMMIT
            
            let block1 = { () in
                try! dbPool.read { db in

            }
            
            // Block 1                      Block 2
            // dbPool.read {
            // SELECT * FROM items
            // step
            // >
