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<!DOCTYPE html>
<title>window.requestIdleCallback deals with timeouts correctly</title>
<meta name="timeout" content="long">
<link rel="author" title="Ross McIlroy" href="mailto:rmcilroy@chromium.org" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test(function() {
// Check whether requestIdleCallback with a timeout works when the event loop
// is busy.
var busy_loop_iterations_remaining = 10; // Should take 20 * 40 = 400ms
var idle_callback_scheduled;
var idle_callback = this.step_func_done(function(deadline) {
assert_false(deadline.didTimeout, "IdleDeadline.didTimeout MUST be false if requestIdleCallback wasn't scheduled due to a timeout");
assert_equals(busy_loop_iterations_remaining, 0, "Busy event loop should be finished by the time we get scheduled");
});
var busy_loop_iterations_remaining = 10; // Should take 20 * 40 = 400ms
step_timeout(this.step_func(function busyLoop() {
var start_time = performance.now();
if (!idle_callback_scheduled) {
idle_callback_scheduled = start_time;
requestIdleCallback(idle_callback);
}
// Use up more than a frames worth of budget.
while (performance.now() - start_time < 40) {
}
if (busy_loop_iterations_remaining > 0) {
busy_loop_iterations_remaining--;
step_timeout(busyLoop);
}
}));
}, 'requestIdleCallback not scheduled when event loop is busy.');
async_test(function() {
// Check whether requestIdleCallback with a timeout works when the event loop
// is busy.
var busy_loop_iterations_remaining = 10; // Should take 20 * 40 = 400ms
var timeout = 200;
var idle_callback_scheduled;
var idle_callback = this.step_func_done(function(deadline) {
var time_delta = performance.now() - idle_callback_scheduled;
assert_true(time_delta >= timeout, "Should only have been run after timeout");
assert_true(deadline.timeRemaining() == 0, "IdleDeadline.timeRemaining MUST be equal to zero if requestIdleCallback was scheduled due to a timeout");
assert_true(deadline.didTimeout, "IdleDeadline.didTimeout MUST be true if requestIdleCallback was scheduled due to a timeout");
assert_true(busy_loop_iterations_remaining > 0, "Busy event loop should still be going");
});
step_timeout(this.step_func(function busyLoop() {
var start_time = performance.now();
if (!idle_callback_scheduled) {
idle_callback_scheduled = start_time;
requestIdleCallback(idle_callback, { timeout: timeout });
}
// Use up more than a frames worth of budget.
while (performance.now() - start_time < 40) {
}
if (busy_loop_iterations_remaining > 0) {
busy_loop_iterations_remaining--;
step_timeout(busyLoop);
}
}));
}, 'requestIdleCallback scheduled with timeout when event loop is busy.');
</script>
<h1>Test of requestIdleCallback timeout behavior</h1>
<div id="log"></div>
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