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/*
* Copyright (C) 2011 Google 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 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 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_PUBLIC_THREAD_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_PUBLIC_THREAD_H_
#include <stdint.h>
#include "base/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/task_observer.h"
#include "base/threading/thread.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/scheduler/public/thread_type.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace base {
class TimeTicks;
namespace sequence_manager {
class TaskTimeObserver;
}
} // namespace base
namespace blink {
class FrameOrWorkerScheduler;
class MainThread;
class NonMainThread;
class ThreadScheduler;
// Always an integer value.
typedef uintptr_t PlatformThreadId;
struct PLATFORM_EXPORT ThreadCreationParams {
explicit ThreadCreationParams(ThreadType);
ThreadCreationParams& SetThreadNameForTest(const char* name);
// Sets a scheduler for the context which was responsible for the creation
// of this thread.
ThreadCreationParams& SetFrameOrWorkerScheduler(FrameOrWorkerScheduler*);
ThreadCreationParams& SetSupportsGC(bool supports_gc);
ThreadType thread_type;
const char* name;
raw_ptr<FrameOrWorkerScheduler> frame_or_worker_scheduler; // NOT OWNED
// Do NOT set the thread priority for non-WebAudio usages. Please consult
// scheduler-dev@ first in order to use an elevated thread priority.
base::ThreadType base_thread_type = base::ThreadType::kDefault;
// The interval at which the thread expects to have work to do. Zero if
// unknown. Used when configuring a thread with `base_thread_type`
// base::ThreadType::kRealtimeAudio.
base::TimeDelta realtime_period;
bool supports_gc = false;
};
// The interface of a thread recognized by Blink.
//
// Deleting the thread blocks until all pending, non-delayed tasks have been
// run.
class PLATFORM_EXPORT Thread {
USING_FAST_MALLOC(Thread);
public:
// An IdleTask is expected to complete before the deadline it is passed.
using IdleTask = base::OnceCallback<void(base::TimeTicks deadline)>;
// TaskObserver is an observer fired before and after a task is executed.
using TaskObserver = base::TaskObserver;
// Create and save (as a global variable) the compositor thread. The thread
// will be accessible through CompositorThread().
static void CreateAndSetCompositorThread();
// Return an interface to the current thread.
static Thread* Current();
// Return an interface to the main thread.
static blink::MainThread* MainThread();
// Return an interface to the compositor thread (if initialized). This can be
// null if the renderer was created with threaded rendering disabled.
static NonMainThread* CompositorThread();
Thread();
Thread(const Thread&) = delete;
Thread& operator=(const Thread&) = delete;
virtual ~Thread();
// Must be called immediately after the construction.
virtual void Init() {}
bool IsCurrentThread() const;
// TaskObserver is an object that receives task notifications from the
// MessageLoop.
// NOTE: TaskObserver implementation should be extremely fast!
// This API is performance sensitive. Use only if you have a compelling
// reason.
void AddTaskObserver(TaskObserver*);
void RemoveTaskObserver(TaskObserver*);
// TaskTimeObserver is an object that receives notifications for
// CPU time spent in each top-level MessageLoop task.
// NOTE: TaskTimeObserver implementation should be extremely fast!
// This API is performance sensitive. Use only if you have a compelling
// reason.
virtual void AddTaskTimeObserver(base::sequence_manager::TaskTimeObserver*) {}
virtual void RemoveTaskTimeObserver(
base::sequence_manager::TaskTimeObserver*) {}
// Returns the start time for the current task. Can be used instead of
// TaskTimeObserver if only task start time is needed.
virtual base::TimeTicks CurrentTaskStartTime() const {
NOTIMPLEMENTED();
return base::TimeTicks();
}
// Returns the scheduler associated with the thread.
virtual ThreadScheduler* Scheduler() = 0;
// See WorkerThread::ShutdownOnThread().
virtual void ShutdownOnThread() {}
protected:
static void UpdateThreadTLS(Thread* thread);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_PUBLIC_THREAD_H_
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