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af1b0b0f14
This commit reverses the order of the `send_pending_events` and `update_animation_timeline` calls in `ScriptThread::update_animations_ send_events` so that animation-related events pended by the latter are processed by the former. The new calling order is more compliant with the "update animations and send events" algorithm steps from [the Web Animations specification][1]. The old implementation was prone to blocking for an indefinite period while holding pending events. Due to complex interaction with other events and timing behavior, I was only able to reproduce the problem under the following conditions: - *The `maybe_observe_paint_time` call in `LayoutThread::compute_abs_ pos_and_build_display_list` is removed from the code*. While performance events may seem irrelevant to the issue, they would bombard the script thread with events. *Any* extra messages received would unblock the event loop and prevent the manifestation of the issue. (But, of course, we aren't supposed to count on that to avoid the issue.) - Servo is running in a headless mode, which somehow makes it less likely for the script thread to receive a `TickAllAnimations` event after sending `AnimationState::NoAnimationsPresent`. With the above conditions met and the stars aligned, you can reproduce the problem by running the WPT test `/css/css-transitions/events-001. html`. [1]: https://drafts.csswg.org/web-animations-1/#update-animations-and-send-events |
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| .. | ||
| allocator | ||
| atoms | ||
| background_hang_monitor | ||
| bluetooth | ||
| bluetooth_traits | ||
| canvas | ||
| canvas_traits | ||
| compositing | ||
| config | ||
| config_plugins | ||
| constellation | ||
| deny_public_fields | ||
| derive_common | ||
| devtools | ||
| devtools_traits | ||
| dom_struct | ||
| domobject_derive | ||
| embedder_traits | ||
| fallible | ||
| geometry | ||
| gfx | ||
| gfx_traits | ||
| hashglobe | ||
| jstraceable_derive | ||
| layout | ||
| layout_2020 | ||
| layout_thread | ||
| layout_thread_2020 | ||
| layout_traits | ||
| malloc_size_of | ||
| media | ||
| metrics | ||
| msg | ||
| net | ||
| net_traits | ||
| pixels | ||
| profile | ||
| profile_traits | ||
| rand | ||
| range | ||
| remutex | ||
| script | ||
| script_layout_interface | ||
| script_plugins | ||
| script_traits | ||
| selectors | ||
| servo | ||
| servo_arc | ||
| size_of_test | ||
| std_test_override | ||
| style | ||
| style_derive | ||
| style_traits | ||
| to_shmem | ||
| to_shmem_derive | ||
| url | ||
| webdriver_server | ||
| webgpu | ||
| webrender_surfman | ||
| webrender_traits | ||