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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GPU_COMMAND_BUFFER_SERVICE_SCHEDULER_TASK_RUNNER_H_
#define GPU_COMMAND_BUFFER_SERVICE_SCHEDULER_TASK_RUNNER_H_
#include "base/memory/raw_ref.h"
#include "base/synchronization/lock.h"
#include "base/task/sequenced_task_runner.h"
#include "gpu/command_buffer/service/gpu_command_buffer_service_export.h"
#include "gpu/command_buffer/service/sequence_id.h"
namespace gpu {
class Scheduler;
// A SequencedTaskRunner implementation to abstract task execution for a
// specific SequenceId on the GPU Scheduler. This object does not support
// delayed tasks, because the underlying Scheduler implementation does not
// support scheduling delayed tasks. Also note that tasks run by this object do
// not support running nested RunLoops.
class GPU_COMMAND_BUFFER_SERVICE_EXPORT SchedulerTaskRunner
: public base::SequencedTaskRunner {
public:
// Constructs a SchedulerTaskRunner that runs tasks on `scheduler`, on the
// sequence identified by `sequence_id`. This instance must not outlive
// `scheduler`.
SchedulerTaskRunner(Scheduler& scheduler, SequenceId sequence_id);
// Once this is called, all subsequent tasks will be rejected.
void ShutDown();
// base::SequencedTaskRunner:
bool PostDelayedTask(const base::Location& from_here,
base::OnceClosure task,
base::TimeDelta delay) override;
bool PostNonNestableDelayedTask(const base::Location& from_here,
base::OnceClosure task,
base::TimeDelta delay) override;
bool RunsTasksInCurrentSequence() const override;
private:
~SchedulerTaskRunner() override;
void RunTask(base::OnceClosure task);
const raw_ref<Scheduler> scheduler_;
const SequenceId sequence_id_;
base::Lock lock_;
bool is_running_ GUARDED_BY(lock_) = true;
};
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_SCHEDULER_TASK_RUNNER_H_
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