The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/dom/indexedDB/test/unit/test_writer_starvation.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,104 @@
     1.4 +/**
     1.5 + * Any copyright is dedicated to the Public Domain.
     1.6 + * http://creativecommons.org/publicdomain/zero/1.0/
     1.7 + */
     1.8 +
     1.9 +if (!this.window) {
    1.10 +  this.runTest = function() {
    1.11 +    todo(false, "Test disabled in xpcshell test suite for now");
    1.12 +    finishTest();
    1.13 +  }
    1.14 +}
    1.15 +
    1.16 +var testGenerator = testSteps();
    1.17 +
    1.18 +function testSteps()
    1.19 +{
    1.20 +  const name = this.window ? window.location.pathname : "Splendid Test";
    1.21 +
    1.22 +  // Needs to be enough to saturate the thread pool.
    1.23 +  const SYNC_REQUEST_COUNT = 25;
    1.24 +
    1.25 +  let request = indexedDB.open(name, 1);
    1.26 +  request.onerror = errorHandler;
    1.27 +  request.onupgradeneeded = grabEventAndContinueHandler;
    1.28 +  request.onsuccess = grabEventAndContinueHandler;
    1.29 +  let event = yield undefined;
    1.30 +
    1.31 +  let db = event.target.result;
    1.32 +  db.onerror = errorHandler;
    1.33 +
    1.34 +  is(event.target.transaction.mode, "versionchange", "Correct mode");
    1.35 +
    1.36 +  let objectStore = db.createObjectStore("foo", { autoIncrement: true });
    1.37 +
    1.38 +  request = objectStore.add({});
    1.39 +  request.onerror = errorHandler;
    1.40 +  request.onsuccess = grabEventAndContinueHandler;
    1.41 +  event = yield undefined;
    1.42 +
    1.43 +  let key = event.target.result;
    1.44 +  ok(key, "Got a key");
    1.45 +
    1.46 +  yield undefined;
    1.47 +
    1.48 +  let continueReading = true;
    1.49 +  let readerCount = 0;
    1.50 +  let writerCount = 0;
    1.51 +  let callbackCount = 0;
    1.52 +
    1.53 +  // Generate a bunch of reads right away without returning to the event
    1.54 +  // loop.
    1.55 +  info("Generating " + SYNC_REQUEST_COUNT + " readonly requests");
    1.56 +
    1.57 +  for (let i = 0; i < SYNC_REQUEST_COUNT; i++) {
    1.58 +    readerCount++;
    1.59 +    let request = db.transaction("foo").objectStore("foo").get(key);
    1.60 +    request.onsuccess = function(event) {
    1.61 +      is(event.target.transaction.mode, "readonly", "Correct mode");
    1.62 +      callbackCount++;
    1.63 +    };
    1.64 +  }
    1.65 +
    1.66 +  while (continueReading) {
    1.67 +    readerCount++;
    1.68 +    info("Generating additional readonly request (" + readerCount + ")");
    1.69 +    let request = db.transaction("foo").objectStore("foo").get(key);
    1.70 +    request.onsuccess = function(event) {
    1.71 +      callbackCount++;
    1.72 +      info("Received readonly request callback (" + callbackCount + ")");
    1.73 +      is(event.target.transaction.mode, "readonly", "Correct mode");
    1.74 +      if (callbackCount == SYNC_REQUEST_COUNT) {
    1.75 +        writerCount++;
    1.76 +        info("Generating 1 readwrite request with " + readerCount +
    1.77 +             " previous readonly requests");
    1.78 +        let request = db.transaction("foo", "readwrite")
    1.79 +                        .objectStore("foo")
    1.80 +                        .add({}, readerCount);
    1.81 +        request.onsuccess = function(event) {
    1.82 +          callbackCount++;
    1.83 +          info("Received readwrite request callback (" + callbackCount + ")");
    1.84 +          is(event.target.transaction.mode, "readwrite", "Correct mode");
    1.85 +          is(event.target.result, callbackCount,
    1.86 +             "write callback came before later reads");
    1.87 +        }
    1.88 +      }
    1.89 +      else if (callbackCount == SYNC_REQUEST_COUNT + 5) {
    1.90 +        continueReading = false;
    1.91 +      }
    1.92 +    };
    1.93 +
    1.94 +    setTimeout(function() { testGenerator.next(); }, writerCount ? 1000 : 100);
    1.95 +    yield undefined;
    1.96 +  }
    1.97 +
    1.98 +  while (callbackCount < (readerCount + writerCount)) {
    1.99 +    executeSoon(function() { testGenerator.next(); });
   1.100 +    yield undefined;
   1.101 +  }
   1.102 +
   1.103 +  is(callbackCount, readerCount + writerCount, "All requests accounted for");
   1.104 +
   1.105 +  finishTest();
   1.106 +  yield undefined;
   1.107 +}