| <!DOCTYPE html><!-- webkit-test-runner [ experimental:RequestIdleCallbackEnabled=true ] --> |
| <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> |
