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2ef37c0b06
...and use HeapFunction instead of SafeFunction for task steps. Since there is only one EventLoop per process, it lives as a global handle in the VM custom data. This makes it much easier to reason about lifetimes of tasks, task steps, and random stuff captured by them.
73 lines
1.7 KiB
C++
73 lines
1.7 KiB
C++
/*
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* Copyright (c) 2021-2024, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/IDAllocator.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/HTML/EventLoop/Task.h>
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namespace Web::HTML {
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JS_DEFINE_ALLOCATOR(Task);
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static IDAllocator s_unique_task_source_allocator { static_cast<int>(Task::Source::UniqueTaskSourceStart) };
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static IDAllocator s_task_id_allocator;
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JS::NonnullGCPtr<Task> Task::create(JS::VM& vm, Source source, JS::GCPtr<DOM::Document const> document, JS::NonnullGCPtr<JS::HeapFunction<void()>> steps)
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{
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return vm.heap().allocate_without_realm<Task>(source, document, move(steps));
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}
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Task::Task(Source source, JS::GCPtr<DOM::Document const> document, JS::NonnullGCPtr<JS::HeapFunction<void()>> steps)
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: m_id(s_task_id_allocator.allocate())
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, m_source(source)
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, m_steps(steps)
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, m_document(document)
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{
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}
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Task::~Task() = default;
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void Task::finalize()
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{
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s_unique_task_source_allocator.deallocate(m_id);
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}
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void Task::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_steps);
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visitor.visit(m_document);
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}
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void Task::execute()
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{
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m_steps->function()();
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}
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// https://html.spec.whatwg.org/#concept-task-runnable
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bool Task::is_runnable() const
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{
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// A task is runnable if its document is either null or fully active.
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return !m_document.ptr() || m_document->is_fully_active();
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}
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DOM::Document const* Task::document() const
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{
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return m_document.ptr();
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}
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UniqueTaskSource::UniqueTaskSource()
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: source(static_cast<Task::Source>(s_unique_task_source_allocator.allocate()))
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{
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}
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UniqueTaskSource::~UniqueTaskSource()
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{
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s_unique_task_source_allocator.deallocate(static_cast<int>(source));
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}
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}
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