WIPjarred/workers

1 files changed, 191 insertions, 0 deletions

diff --git a/src/javascript/jsc/bindings/webcore/EventLoop.cpp b/src/javascript/jsc/bindings/webcore/EventLoop.cpp
new file mode 100644
index 000000000..6782ffe42
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/EventLoop.cpp
@@ -0,0 +1,191 @@
+/*
+ * Copyright (C) 2019 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "EventLoop.h"
+
+#include "Microtasks.h"
+
+namespace WebCore {
+
+void EventLoop::queueTask(std::unique_ptr<EventLoopTask>&& task)
+{
+    ASSERT(task->taskSource() != TaskSource::Microtask);
+    ASSERT(task->group());
+    ASSERT(isContextThread());
+    scheduleToRunIfNeeded();
+    m_tasks.append(WTFMove(task));
+}
+
+void EventLoop::queueMicrotask(std::unique_ptr<EventLoopTask>&& microtask)
+{
+    ASSERT(microtask->taskSource() == TaskSource::Microtask);
+    microtaskQueue().append(WTFMove(microtask));
+    scheduleToRunIfNeeded(); // FIXME: Remove this once everything is integrated with the event loop.
+}
+
+void EventLoop::performMicrotaskCheckpoint()
+{
+    microtaskQueue().performMicrotaskCheckpoint();
+}
+
+void EventLoop::resumeGroup(EventLoopTaskGroup& group)
+{
+    ASSERT(isContextThread());
+    if (!m_groupsWithSuspendedTasks.contains(group))
+        return;
+    scheduleToRunIfNeeded();
+}
+
+void EventLoop::registerGroup(EventLoopTaskGroup& group)
+{
+    ASSERT(isContextThread());
+    m_associatedGroups.add(group);
+}
+
+void EventLoop::unregisterGroup(EventLoopTaskGroup& group)
+{
+    ASSERT(isContextThread());
+    if (m_associatedGroups.remove(group))
+        stopAssociatedGroupsIfNecessary();
+}
+
+void EventLoop::stopAssociatedGroupsIfNecessary()
+{
+    ASSERT(isContextThread());
+    for (auto& group : m_associatedGroups) {
+        if (!group.isReadyToStop())
+            return;
+    }
+    auto associatedGroups = std::exchange(m_associatedGroups, { });
+    for (auto& group : associatedGroups)
+        group.stopAndDiscardAllTasks();
+}
+
+void EventLoop::stopGroup(EventLoopTaskGroup& group)
+{
+    ASSERT(isContextThread());
+    m_tasks.removeAllMatching([&group] (auto& task) {
+        return group.matchesTask(*task);
+    });
+}
+
+void EventLoop::scheduleToRunIfNeeded()
+{
+    if (m_isScheduledToRun)
+        return;
+    m_isScheduledToRun = true;
+    scheduleToRun();
+}
+
+void EventLoop::run()
+{
+    m_isScheduledToRun = false;
+    bool didPerformMicrotaskCheckpoint = false;
+
+    if (!m_tasks.isEmpty()) {
+        auto tasks = std::exchange(m_tasks, { });
+        m_groupsWithSuspendedTasks.clear();
+        Vector<std::unique_ptr<EventLoopTask>> remainingTasks;
+        for (auto& task : tasks) {
+            auto* group = task->group();
+            if (!group || group->isStoppedPermanently())
+                continue;
+
+            if (group->isSuspended()) {
+                m_groupsWithSuspendedTasks.add(*group);
+                remainingTasks.append(WTFMove(task));
+                continue;
+            }
+
+            task->execute();
+            didPerformMicrotaskCheckpoint = true;
+            microtaskQueue().performMicrotaskCheckpoint();
+        }
+        for (auto& task : m_tasks)
+            remainingTasks.append(WTFMove(task));
+        m_tasks = WTFMove(remainingTasks);
+    }
+
+    // FIXME: Remove this once everything is integrated with the event loop.
+    if (!didPerformMicrotaskCheckpoint)
+        microtaskQueue().performMicrotaskCheckpoint();
+}
+
+void EventLoop::clearAllTasks()
+{
+    m_tasks.clear();
+    m_groupsWithSuspendedTasks.clear();
+}
+
+void EventLoopTaskGroup::queueTask(std::unique_ptr<EventLoopTask>&& task)
+{
+    if (m_state == State::Stopped || !m_eventLoop)
+        return;
+    ASSERT(task->group() == this);
+    m_eventLoop->queueTask(WTFMove(task));
+}
+
+class EventLoopFunctionDispatchTask : public EventLoopTask {
+public:
+    EventLoopFunctionDispatchTask(TaskSource source, EventLoopTaskGroup& group, EventLoop::TaskFunction&& function)
+        : EventLoopTask(source, group)
+        , m_function(WTFMove(function))
+    {
+    }
+
+    void execute() final { m_function(); }
+
+private:
+    EventLoop::TaskFunction m_function;
+};
+
+void EventLoopTaskGroup::queueTask(TaskSource source, EventLoop::TaskFunction&& function)
+{
+    return queueTask(makeUnique<EventLoopFunctionDispatchTask>(source, *this, WTFMove(function)));
+}
+
+void EventLoopTaskGroup::queueMicrotask(EventLoop::TaskFunction&& function)
+{
+    if (m_state == State::Stopped || !m_eventLoop)
+        return;
+    m_eventLoop->queueMicrotask(makeUnique<EventLoopFunctionDispatchTask>(TaskSource::Microtask, *this, WTFMove(function)));
+}
+
+void EventLoopTaskGroup::performMicrotaskCheckpoint()
+{
+    if (m_eventLoop)
+        m_eventLoop->performMicrotaskCheckpoint();
+}
+
+void EventLoopTaskGroup::runAtEndOfMicrotaskCheckpoint(EventLoop::TaskFunction&& function)
+{
+    if (m_state == State::Stopped || !m_eventLoop)
+        return;
+
+    microtaskQueue().addCheckpointTask(makeUnique<EventLoopFunctionDispatchTask>(TaskSource::IndexedDB, *this, WTFMove(function)));
+}
+
+} // namespace WebCore