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LibWeb: Implement window.queueMicrotask(callback)

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This API allows authors to schedule a serialized JS callback that will
get invoked at the next spec-allowed opportunity.
This commit is contained in:
Andreas Kling 2021-09-26 14:36:20 +02:00
parent 831fdcaabc
commit a248ec63e3
10 changed files with 144 additions and 19 deletions
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11
Userland/Libraries/LibWeb/HTML/EventLoop/EventLoop.h
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@ -32,6 +32,9 @@ public:
TaskQueue& task_queue() { return m_task_queue; }
TaskQueue const& task_queue() const { return m_task_queue; }
TaskQueue& microtask_queue() { return m_microtask_queue; }
TaskQueue const& microtask_queue() const { return m_microtask_queue; }
void spin_until(Function<bool()> goal_condition);
void process();
@ -44,10 +47,13 @@ public:
void schedule();
void perform_a_microtask_checkpoint();
private:
Type m_type { Type::Window };
TaskQueue m_task_queue;
TaskQueue m_microtask_queue;
// https://html.spec.whatwg.org/multipage/webappapis.html#currently-running-task
Task* m_currently_running_task { nullptr };
@ -55,9 +61,14 @@ private:
JS::VM* m_vm { nullptr };
RefPtr<Core::Timer> m_system_event_loop_timer;
// https://html.spec.whatwg.org/#performing-a-microtask-checkpoint
bool m_performing_a_microtask_checkpoint { false };
};
EventLoop& main_thread_event_loop();
void queue_global_task(HTML::Task::Source, DOM::Document&, Function<void()> steps);
void queue_a_microtask(DOM::Document&, Function<void()> steps);
void perform_a_microtask_checkpoint();
}