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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
* Copyright (C) 2017-2021 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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.
*/
#pragma once
#include "ScriptExecutionContext.h"
#include <memory>
#include <wtf/MessageQueue.h>
#include <wtf/TZoneMalloc.h>
namespace WebCore {
class WorkerMainRunLoop;
}
namespace WTF {
template<typename T> struct IsDeprecatedWeakRefSmartPointerException;
template<> struct IsDeprecatedWeakRefSmartPointerException<WebCore::WorkerMainRunLoop> : std::true_type { };
}
namespace WebCore {
class WeakPtrImplWithEventTargetData;
class ModePredicate;
class WorkerOrWorkletGlobalScope;
class WorkerSharedTimer;
class WorkerRunLoop {
WTF_MAKE_TZONE_ALLOCATED(WorkerRunLoop);
public:
enum class Type : bool { WorkerDedicatedRunLoop, WorkerMainRunLoop };
virtual ~WorkerRunLoop() = default;
virtual bool runInMode(WorkerOrWorkletGlobalScope*, const String& mode, bool allowEventLoopTasks = false) = 0;
virtual void postTaskAndTerminate(ScriptExecutionContext::Task&&) = 0;
virtual void postTaskForMode(ScriptExecutionContext::Task&&, const String& mode) = 0;
virtual void terminate() = 0;
virtual bool terminated() const = 0;
virtual Type type() const = 0;
void postTask(ScriptExecutionContext::Task&&);
void postDebuggerTask(ScriptExecutionContext::Task&&);
WEBCORE_EXPORT static String defaultMode();
unsigned long createUniqueId() { return ++m_uniqueId; }
private:
unsigned long m_uniqueId { 0 };
};
class WorkerDedicatedRunLoop final : public WorkerRunLoop {
WTF_MAKE_TZONE_ALLOCATED(WorkerDedicatedRunLoop);
public:
WorkerDedicatedRunLoop();
~WorkerDedicatedRunLoop();
// Blocking call. Waits for tasks and timers, invokes the callbacks.
void run(WorkerOrWorkletGlobalScope*);
// Waits for a single task and returns.
bool runInMode(WorkerOrWorkletGlobalScope*, const String& mode, bool) final;
MessageQueueWaitResult runInDebuggerMode(WorkerOrWorkletGlobalScope&);
void terminate() final;
bool terminated() const final { return m_messageQueue.killed(); }
Type type() const final { return Type::WorkerDedicatedRunLoop; }
void postTaskAndTerminate(ScriptExecutionContext::Task&&) final;
WEBCORE_EXPORT void postTaskForMode(ScriptExecutionContext::Task&&, const String& mode) final;
class Task {
WTF_MAKE_TZONE_ALLOCATED(Task);
WTF_MAKE_NONCOPYABLE(Task);
public:
Task(ScriptExecutionContext::Task&&, const String& mode);
const String& mode() const { return m_mode; }
private:
void performTask(WorkerOrWorkletGlobalScope*);
ScriptExecutionContext::Task m_task;
String m_mode;
friend class WorkerDedicatedRunLoop;
};
private:
friend class RunLoopSetup;
MessageQueueWaitResult runInMode(WorkerOrWorkletGlobalScope*, const ModePredicate&);
// Runs any clean up tasks that are currently in the queue and returns.
// This should only be called when the context is closed or loop has been terminated.
void runCleanupTasks(WorkerOrWorkletGlobalScope*);
bool isBeingDebugged() const { return m_debugCount >= 1; }
MessageQueue<Task> m_messageQueue;
std::unique_ptr<WorkerSharedTimer> m_sharedTimer;
int m_nestedCount { 0 };
int m_debugCount { 0 };
};
class WorkerMainRunLoop final : public WorkerRunLoop, public CanMakeWeakPtr<WorkerMainRunLoop, WeakPtrFactoryInitialization::Eager> {
public:
WorkerMainRunLoop();
void setGlobalScope(WorkerOrWorkletGlobalScope&);
void terminate() final { m_terminated = true; }
bool terminated() const final { return m_terminated; }
bool runInMode(WorkerOrWorkletGlobalScope*, const String& mode, bool);
void postTaskAndTerminate(ScriptExecutionContext::Task&&) final;
void postTaskForMode(ScriptExecutionContext::Task&&, const String& mode) final;
Type type() const final { return Type::WorkerMainRunLoop; }
private:
WeakPtr<WorkerOrWorkletGlobalScope> m_workerOrWorkletGlobalScope;
bool m_terminated { false };
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::WorkerDedicatedRunLoop)
static bool isType(const WebCore::WorkerRunLoop& runLoop) { return runLoop.type() == WebCore::WorkerRunLoop::Type::WorkerDedicatedRunLoop; }
SPECIALIZE_TYPE_TRAITS_END()
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::WorkerMainRunLoop)
static bool isType(const WebCore::WorkerRunLoop& runLoop) { return runLoop.type() == WebCore::WorkerRunLoop::Type::WorkerMainRunLoop; }
SPECIALIZE_TYPE_TRAITS_END()
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