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