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      1 function terminateTest()
      2 {
      3     if (window.layoutTestController)
      4         layoutTestController.notifyDone();
      5 }
      6 
      7 function openTestDatabase()
      8 {
      9     return openDatabaseWithSuffix("ReadAndWriteTransactionsDontRunTogetherTest",
     10                                   "1.0",
     11                                   "Test to make sure that read and write transactions on different DB handles to the same DB don't run at the same time.",
     12                                   32768);
     13 }
     14 
     15 var readTransactionsInProgress = 0;
     16 var writeTransactionsInProgress = 0;
     17 var totalTransactions = 0;
     18 var finishedTransactions = 0;
     19 
     20 function runTransaction(db, readOnly)
     21 {
     22     var transactionFunction = (readOnly ? db.readTransaction : db.transaction);
     23     transactionFunction.call(db, function(tx) {
     24             if (readOnly) {
     25                 if (writeTransactionsInProgress != 0) {
     26                     log("Read transaction starting while write transaction in progress.");
     27                     terminateTest();
     28                 }
     29                 readTransactionsInProgress++;
     30             } else {
     31                 if ((readTransactionsInProgress != 0) || (writeTransactionsInProgress != 0)) {
     32                     log("Write transaction starting while another transaction in progress.");
     33                     terminateTest();
     34                 }
     35                 writeTransactionsInProgress++;
     36             }
     37             tx.executeSql("SELECT * FROM Test;");
     38         }, function(error) {
     39             log((readOnly ? "Read" : "Write") + " transaction failed: " + error.message);
     40             terminateTest();
     41         }, function() {
     42              finishedTransactions++;
     43              if (readOnly)
     44                  readTransactionsInProgress--;
     45              else
     46                  writeTransactionsInProgress--;
     47              log("Transaction successful.");
     48              if ((finishedTransactions == totalTransactions) && (readTransactionsInProgress == 0) && (writeTransactionsInProgress == 0))
     49                  terminateTest();
     50         });
     51 }
     52 
     53 function runReadAndWriteTransactions(db1, db2, db3)
     54 {
     55     totalTransactions = 10;
     56     finishedTransactions = 0;
     57     runTransaction(db1, true);
     58     runTransaction(db2, true);
     59     runTransaction(db1, false);
     60     runTransaction(db1, true);
     61     runTransaction(db2, true);
     62     runTransaction(db3, true);
     63     runTransaction(db1, false);
     64     runTransaction(db2, false);
     65     runTransaction(db1, true);
     66     runTransaction(db3, true);
     67 }
     68 
     69 function runTest() {
     70     var db1 = openTestDatabase();
     71     var db2 = openTestDatabase();
     72     var db3 = openTestDatabase();
     73     db1.transaction(function(tx) {
     74             tx.executeSql("CREATE TABLE IF NOT EXISTS Test (Foo int);");
     75         }, function(error) {
     76             log("Cannot create the Test table: " + error.message);
     77             terminateTest();
     78         }, function() {
     79             runReadAndWriteTransactions(db1, db2, db3);
     80         });
     81 }
     82