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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WEB_THREAD_SUPPORTING_GC_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WEB_THREAD_SUPPORTING_GC_H_
#include <memory>
#include "base/threading/thread_checker.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/web_thread.h"
#include "third_party/blink/renderer/platform/heap/gc_task_runner.h"
#include "third_party/blink/renderer/platform/web_task_runner.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/noncopyable.h"
#include "third_party/blink/renderer/platform/wtf/time.h"
namespace blink {
// WebThreadSupportingGC wraps a WebThread and adds support for attaching
// to and detaching from the Blink GC infrastructure.
//
// The initialize method must be called during initialization on the WebThread
// and before the thread allocates any objects managed by the Blink GC. The
// shutdown method must be called on the WebThread during shutdown when the
// thread no longer needs to access objects managed by the Blink GC.
//
// WebThreadSupportingGC usually internally creates and owns WebThread unless
// an existing WebThread is given via createForThread.
class PLATFORM_EXPORT WebThreadSupportingGC final {
USING_FAST_MALLOC(WebThreadSupportingGC);
WTF_MAKE_NONCOPYABLE(WebThreadSupportingGC);
public:
static std::unique_ptr<WebThreadSupportingGC> Create(
const WebThreadCreationParams&);
static std::unique_ptr<WebThreadSupportingGC> CreateForThread(WebThread*);
~WebThreadSupportingGC();
void PostTask(const base::Location& location, base::OnceClosure task) {
thread_->GetTaskRunner()->PostTask(location, std::move(task));
}
void PostDelayedTask(const base::Location& location,
base::OnceClosure task,
TimeDelta delay) {
thread_->GetTaskRunner()->PostDelayedTask(location, std::move(task), delay);
}
void PostTask(const base::Location& location, CrossThreadClosure task) {
PostCrossThreadTask(*thread_->GetTaskRunner(), location, std::move(task));
}
void PostDelayedTask(const base::Location& location,
CrossThreadClosure task,
TimeDelta delay) {
PostDelayedCrossThreadTask(*thread_->GetTaskRunner(), location,
std::move(task), delay);
}
bool IsCurrentThread() const { return thread_->IsCurrentThread(); }
void AddTaskObserver(WebThread::TaskObserver* observer) {
thread_->AddTaskObserver(observer);
}
void RemoveTaskObserver(WebThread::TaskObserver* observer) {
thread_->RemoveTaskObserver(observer);
}
// Must be called on the WebThread.
void InitializeOnThread();
void ShutdownOnThread();
WebThread& PlatformThread() const {
DCHECK(thread_);
return *thread_;
}
private:
WebThreadSupportingGC(const WebThreadCreationParams*, WebThread*);
std::unique_ptr<GCTaskRunner> gc_task_runner_;
// m_thread is guaranteed to be non-null after this instance is constructed.
// m_owningThread is non-null unless this instance is constructed for an
// existing thread via createForThread().
WebThread* thread_ = nullptr;
std::unique_ptr<WebThread> owning_thread_;
THREAD_CHECKER(thread_checker_);
};
} // namespace blink
#endif
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