callback-timeout-when-busy.html (2953B)
1 <!DOCTYPE html> 2 <title>window.requestIdleCallback deals with timeouts correctly</title> 3 <meta name="timeout" content="long"> 4 <link rel="author" title="Ross McIlroy" href="mailto:rmcilroy@chromium.org" /> 5 <script src="/resources/testharness.js"></script> 6 <script src="/resources/testharnessreport.js"></script> 7 <script> 8 9 async_test(function() { 10 // Check whether requestIdleCallback with a timeout works when the event loop 11 // is busy. 12 var busy_loop_iterations_remaining = 10; // Should take 20 * 40 = 400ms 13 var idle_callback_scheduled; 14 var idle_callback = this.step_func_done(function(deadline) { 15 assert_false(deadline.didTimeout, "IdleDeadline.didTimeout MUST be false if requestIdleCallback wasn't scheduled due to a timeout"); 16 assert_equals(busy_loop_iterations_remaining, 0, "Busy event loop should be finished by the time we get scheduled"); 17 }); 18 19 var busy_loop_iterations_remaining = 10; // Should take 20 * 40 = 400ms 20 step_timeout(this.step_func(function busyLoop() { 21 var start_time = performance.now(); 22 if (!idle_callback_scheduled) { 23 idle_callback_scheduled = start_time; 24 requestIdleCallback(idle_callback); 25 } 26 27 // Use up more than a frames worth of budget. 28 while (performance.now() - start_time < 40) { 29 } 30 if (busy_loop_iterations_remaining > 0) { 31 busy_loop_iterations_remaining--; 32 step_timeout(busyLoop); 33 } 34 })); 35 }, 'requestIdleCallback not scheduled when event loop is busy.'); 36 37 async_test(function() { 38 // Check whether requestIdleCallback with a timeout works when the event loop 39 // is busy. 40 var busy_loop_iterations_remaining = 10; // Should take 20 * 40 = 400ms 41 var timeout = 200; 42 var idle_callback_scheduled; 43 var idle_callback = this.step_func_done(function(deadline) { 44 var time_delta = performance.now() - idle_callback_scheduled; 45 assert_true(time_delta >= timeout, "Should only have been run after timeout"); 46 assert_true(deadline.timeRemaining() == 0, "IdleDeadline.timeRemaining MUST be equal to zero if requestIdleCallback was scheduled due to a timeout"); 47 assert_true(deadline.didTimeout, "IdleDeadline.didTimeout MUST be true if requestIdleCallback was scheduled due to a timeout"); 48 assert_true(busy_loop_iterations_remaining > 0, "Busy event loop should still be going"); 49 }); 50 51 step_timeout(this.step_func(function busyLoop() { 52 var start_time = performance.now(); 53 if (!idle_callback_scheduled) { 54 idle_callback_scheduled = start_time; 55 requestIdleCallback(idle_callback, { timeout: timeout }); 56 } 57 58 // Use up more than a frames worth of budget. 59 while (performance.now() - start_time < 40) { 60 } 61 if (busy_loop_iterations_remaining > 0) { 62 busy_loop_iterations_remaining--; 63 step_timeout(busyLoop); 64 } 65 })); 66 }, 'requestIdleCallback scheduled with timeout when event loop is busy.'); 67 68 </script> 69 <h1>Test of requestIdleCallback timeout behavior</h1> 70 <div id="log"></div>