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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TASK_THREAD_POOL_POOLED_SEQUENCED_TASK_RUNNER_H_
#define BASE_TASK_THREAD_POOL_POOLED_SEQUENCED_TASK_RUNNER_H_
#include "base/base_export.h"
#include "base/functional/callback_forward.h"
#include "base/location.h"
#include "base/memory/raw_ptr.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool/pooled_task_runner_delegate.h"
#include "base/task/thread_pool/sequence.h"
#include "base/task/updateable_sequenced_task_runner.h"
#include "base/time/time.h"
namespace base {
namespace internal {
// A task runner that runs tasks in sequence.
class BASE_EXPORT PooledSequencedTaskRunner
: public UpdateableSequencedTaskRunner {
public:
// Constructs a PooledSequencedTaskRunner which can be used to post tasks.
PooledSequencedTaskRunner(
const TaskTraits& traits,
PooledTaskRunnerDelegate* pooled_task_runner_delegate);
PooledSequencedTaskRunner(const PooledSequencedTaskRunner&) = delete;
PooledSequencedTaskRunner& operator=(const PooledSequencedTaskRunner&) =
delete;
scoped_refptr<Sequence> sequence() { return sequence_; }
// UpdateableSequencedTaskRunner:
bool PostDelayedTask(const Location& from_here,
OnceClosure closure,
TimeDelta delay) override;
bool PostDelayedTaskAt(subtle::PostDelayedTaskPassKey,
const Location& from_here,
OnceClosure closure,
TimeTicks delayed_run_time,
subtle::DelayPolicy delay_policy) override;
bool PostNonNestableDelayedTask(const Location& from_here,
OnceClosure closure,
TimeDelta delay) override;
bool RunsTasksInCurrentSequence() const override;
void UpdatePriority(TaskPriority priority) override;
private:
~PooledSequencedTaskRunner() override;
// Dangling usage guarded by MatchesCurrentDelegate() checks.
const raw_ptr<PooledTaskRunnerDelegate, DisableDanglingPtrDetection>
pooled_task_runner_delegate_;
// Sequence for all Tasks posted through this TaskRunner.
const scoped_refptr<Sequence> sequence_;
};
} // namespace internal
} // namespace base
#endif // BASE_TASK_THREAD_POOL_POOLED_SEQUENCED_TASK_RUNNER_H_
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