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// Copyright 2022 The Chromium Authors
// 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_SCHEDULER_PUBLIC_MAIN_THREAD_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_PUBLIC_MAIN_THREAD_H_
#include "base/task/single_thread_task_runner.h"
#include "third_party/blink/renderer/platform/scheduler/public/thread.h"
namespace blink {
// This class restricts access to the `GetTaskRunner`. Only authorized callees
// are allowed. Before you add a restriction consider using a frame or worker
// based API instead.
class MainThreadTaskRunnerRestricted {
private:
// Permitted users of `MainThread::GetTaskRunner`.
friend class BlinkCategorizedWorkerPoolDelegate;
friend class BlinkInitializer;
friend class BlobBytesProvider;
friend class CachedStorageArea;
friend class DevToolsAgent;
friend class FontCache;
friend class InspectorNetworkAgent;
friend class MemoryCache;
friend class ParkableImageManager;
friend class ParkableStringManager;
friend class RendererResourceCoordinatorImpl;
friend class SharedGpuContext;
friend class SharedWorkerReportingProxy;
friend class ThreadedIconLoader;
friend class V8WorkerMemoryReporter;
friend class WebGLWebCodecsVideoFrame;
friend class WebRtcVideoFrameAdapter;
friend class WorkerGlobalScope;
friend class CanvasHibernationHandler;
friend class HibernatedCanvasMemoryDumpProvider;
friend class MainThreadTaskRunnerRestrictedForTesting;
friend MainThreadTaskRunnerRestricted AccessMainThreadForGpuFactories();
friend MainThreadTaskRunnerRestricted
AccessMainThreadForWebGraphicsContext3DProvider();
friend MainThreadTaskRunnerRestricted
AccessMainThreadForGpuMemoryBufferManager();
MainThreadTaskRunnerRestricted() = default;
};
class MainThreadTaskRunnerRestrictedForTesting
: public MainThreadTaskRunnerRestricted {};
// The interface of a main thread in Blink.
//
// This class will has a restricted GetTaskRunner method.
//
class PLATFORM_EXPORT MainThread : public Thread {
public:
friend class Platform; // For SetMainThread() and IsSimpleMainThread().
friend class ScopedMainThreadOverrider; // For SetMainThread().
// Task runner for the main thread. This should only be used in
// specific scenarios. Likely you want a frame or worker based task runner
// instead.
virtual scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner(
MainThreadTaskRunnerRestricted) const = 0;
private:
// For Platform and ScopedMainThreadOverrider. Return the thread object
// previously set (if any).
//
// This is done this way because we need to be able to "override" the main
// thread temporarily for ScopedTestingPlatformSupport.
static std::unique_ptr<MainThread> SetMainThread(std::unique_ptr<MainThread>);
// This is used to identify the actual Thread instance. This should be
// used only in Platform, and other users should ignore this.
virtual bool IsSimpleMainThread() const { return false; }
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_PUBLIC_MAIN_THREAD_H_
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