1 files changed, 105 insertions, 0 deletions
diff --git a/testing/web-platform/tests/IndexedDB/writer-starvation.htm b/testing/web-platform/tests/IndexedDB/writer-starvation.htm
new file mode 100644
index 0000000000..df9c5dc757
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+++ b/testing/web-platform/tests/IndexedDB/writer-starvation.htm
@@ -0,0 +1,105 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Writer starvation</title>
+<link rel="author" href="mailto:odinho@opera.com" title="Odin Hørthe Omdal">
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=resources/support.js></script>
+
+<script>
+    var db, read_request_count = 0, read_success_count = 0;
+    var write_request_count = 0, write_success_count = 0;
+    var RQ_COUNT = 25;
+
+    var open_rq = createdb(async_test(undefined));
+    open_rq.onupgradeneeded = function(e) {
+        db = e.target.result;
+        db.createObjectStore("s")
+          .add("1", 1);
+    }
+
+    open_rq.onsuccess = function(e) {
+        var i = 0, continue_reading = true;
+
+        /* Pre-fill some read requests */
+        for (i = 0; i < RQ_COUNT; i++)
+        {
+            read_request_count++;
+
+            db.transaction("s", "readonly", {durability: 'relaxed'})
+              .objectStore("s")
+              .get(1)
+              .onsuccess = this.step_func(function(e) {
+                    read_success_count++;
+                    assert_equals(e.target.transaction.mode, "readonly");
+                });
+        }
+
+        this.step(loop);
+
+        function loop() {
+            read_request_count++;
+
+            db.transaction("s", "readonly", {durability: 'relaxed'})
+              .objectStore("s")
+              .get(1)
+              .onsuccess = this.step_func(function(e)
+            {
+                read_success_count++;
+                assert_equals(e.target.transaction.mode, "readonly");
+
+                if (read_success_count >= RQ_COUNT && write_request_count == 0)
+                {
+                    write_request_count++;
+
+                    db.transaction("s", "readwrite", {durability: 'relaxed'})
+                      .objectStore("s")
+                      .add("written", read_request_count)
+                      .onsuccess = this.step_func(function(e)
+                    {
+                        write_success_count++;
+                        assert_equals(e.target.transaction.mode, "readwrite");
+                        assert_equals(e.target.result, read_success_count,
+                                       "write cb came before later read cb's")
+                    });
+
+                    /* Reads done after the write */
+                    for (i = 0; i < 5; i++)
+                    {
+                        read_request_count++;
+
+                        db.transaction("s", "readonly", {durability: 'relaxed'})
+                          .objectStore("s")
+                          .get(1)
+                          .onsuccess = this.step_func(function(e)
+                        {
+                            read_success_count++;
+                        });
+                    }
+                }
+            });
+
+            if (read_success_count < RQ_COUNT + 5)
+                step_timeout(this.step_func(loop), write_request_count ? 1000 : 100);
+            else
+                // This is merely a "nice" hack to run finish after the last request is done
+                db.transaction("s", "readonly", {durability: 'relaxed'})
+                  .objectStore("s")
+                  .count()
+                  .onsuccess = this.step_func(function()
+                {
+                    step_timeout(this.step_func(finish), 100);
+                });
+        }
+    }
+
+
+function finish() {
+    assert_equals(read_request_count, read_success_count, "read counts");
+    assert_equals(write_request_count, write_success_count, "write counts");
+    this.done();
+}
+</script>
+
+<div id=log></div>