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<!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=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, {timeout: 20000}));
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")
.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")
.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")
.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")
.objectStore("s")
.get(1)
.onsuccess = this.step_func(function(e)
{
read_success_count++;
});
}
}
});
if (read_success_count < RQ_COUNT + 5)
setTimeout(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")
.objectStore("s")
.count()
.onsuccess = this.step_func(function()
{
setTimeout(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>
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