gecko/dom/indexedDB/test/test_writer_starvation.html

114 lines
3.4 KiB
HTML

<!--
Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/
-->
<html>
<head>
<title>Indexed Database Property Test</title>
<script type="text/javascript" src="/MochiKit/packed.js"></script>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<script type="text/javascript;version=1.7">
function testSteps()
{
const READ_ONLY = Components.interfaces.nsIIDBTransaction.READ_ONLY;
const READ_WRITE = Components.interfaces.nsIIDBTransaction.READ_WRITE;
const VERSION_CHANGE =
Components.interfaces.nsIIDBTransaction.VERSION_CHANGE;
const name = window.location.pathname;
const description = "My Test Database";
let request = moz_indexedDB.open(name, description);
request.onerror = errorHandler;
request.onsuccess = grabEventAndContinueHandler;
let event = yield;
let db = event.result;
request = db.setVersion("1");
request.onerror = errorHandler;
request.onsuccess = grabEventAndContinueHandler;
let event = yield;
is(event.transaction.mode, VERSION_CHANGE, "Correct mode");
let objectStore = db.createObjectStore("foo", "", true);
request = objectStore.add({});
request.onerror = errorHandler;
request.onsuccess = grabEventAndContinueHandler;
event = yield;
let key = event.result;
ok(key, "Got a key");
SimpleTest.executeSoon(function() { testGenerator.next(); });
yield;
let continueReading = true;
let readerCount = 0;
let callbackCount = 0;
let finalCallbackCount = 0;
// Generate a bunch of reads right away without returning to the event
// loop.
for (let i = 0; i < 20; i++) {
readerCount++;
request = db.transaction("foo").objectStore("foo").get(key);
request.onerror = errorHandler;
request.onsuccess = function(event) {
callbackCount++;
};
}
while (continueReading) {
readerCount++;
request = db.transaction("foo").objectStore("foo").get(key);
request.onerror = errorHandler;
request.onsuccess = function(event) {
is(event.transaction.mode, READ_ONLY, "Correct mode");
callbackCount++;
if (callbackCount == 100) {
request = db.transaction("foo", READ_WRITE)
.objectStore("foo")
.add({}, readerCount);
request.onerror = errorHandler;
request.onsuccess = function(event) {
continueReading = false;
finalCallbackCount = callbackCount;
is(event.result, callbackCount,
"write callback came before later reads");
}
}
};
SimpleTest.executeSoon(function() { testGenerator.next(); });
yield;
}
while (callbackCount < readerCount) {
SimpleTest.executeSoon(function() { testGenerator.next(); });
yield;
}
is(callbackCount, readerCount, "All requests accounted for");
ok(callbackCount > finalCallbackCount, "More readers after writer");
finishTest();
yield;
}
SimpleTest.requestLongerTimeout(5); // see bug 580875
</script>
<script type="text/javascript;version=1.7" src="helpers.js"></script>
</head>
<body onload="runTest();"></body>
</html>