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      1 <html>
      2 <head>
      3 <script>
      4 
      5 function log(message)
      6 {
      7     document.body.innerHTML += message + "<br>";
      8 }
      9 
     10 function terminateTest()
     11 {
     12     if (window.layoutTestController)
     13         layoutTestController.notifyDone();
     14 }
     15 
     16 function openTestDatabase()
     17 {
     18     return openDatabase("ReadAndWriteTransactionsDontRunTogetherTest",
     19                         "1.0",
     20                         "Test to make sure that read and write transactions on different DB handles to the same DB don't run at the same time.",
     21                         32768);
     22 }
     23 
     24 var readTransactionsInProgress = 0;
     25 var writeTransactionsInProgress = 0;
     26 var totalTransactions = 0;
     27 var finishedTransactions = 0;
     28 
     29 function runTransaction(db, readOnly)
     30 {
     31     var transactionFunction = (readOnly ? db.readTransaction : db.transaction);
     32     transactionFunction.call(db, function(tx) {
     33             if (readOnly) {
     34                 if (writeTransactionsInProgress != 0) {
     35                     log("Read transaction starting while write transaction in progress.");
     36                     terminateTest();
     37                 }
     38                 readTransactionsInProgress++;
     39             } else {
     40                 if ((readTransactionsInProgress != 0) || (writeTransactionsInProgress != 0)) {
     41                     log("Write transaction starting while another transaction in progress.");
     42                     terminateTest();
     43                 }
     44                 writeTransactionsInProgress++;
     45             }
     46             tx.executeSql("SELECT * FROM Test;");
     47         }, function(error) {
     48             log((readOnly ? "Read" : "Write") + " transaction failed: " + error.message);
     49             terminateTest();
     50         }, function() {
     51              finishedTransactions++;
     52              if (readOnly)
     53                  readTransactionsInProgress--;
     54              else
     55                  writeTransactionsInProgress--;
     56              log("Transaction successful.");
     57              if ((finishedTransactions == totalTransactions) && (readTransactionsInProgress == 0) && (writeTransactionsInProgress == 0))
     58                  terminateTest();
     59         });
     60 }
     61 
     62 function runReadAndWriteTransactions(db1, db2, db3)
     63 {
     64     totalTransactions = 10;
     65     finishedTransactions = 0;
     66     runTransaction(db1, true);
     67     runTransaction(db2, true);
     68     runTransaction(db1, false);
     69     runTransaction(db1, true);
     70     runTransaction(db2, true);
     71     runTransaction(db3, true);
     72     runTransaction(db1, false);
     73     runTransaction(db2, false);
     74     runTransaction(db1, true);
     75     runTransaction(db3, true);
     76 }
     77 
     78 function runTest() {
     79     if (window.layoutTestController) {
     80         layoutTestController.dumpAsText();
     81         layoutTestController.waitUntilDone();
     82     }
     83 
     84     try {
     85         var db1 = openTestDatabase();
     86         var db2 = openTestDatabase();
     87         var db3 = openTestDatabase();
     88         db1.transaction(function(tx) {
     89                 tx.executeSql("CREATE TABLE IF NOT EXISTS Test (Foo int);");
     90             }, function(error) {
     91                 log("Cannot create the Test table: " + error.message);
     92                 terminateTest();
     93             }, function() {
     94                 runReadAndWriteTransactions(db1, db2, db3);
     95             });
     96      } catch(err) {}
     97 }
     98 </script>
     99 </head>
    100 <body onload="runTest();">
    101 This test tests that read and write transactions on different handles to the same database don't run together.<br>
    102 </body>
    103 </html>
    104