blob: 285f85377d7028e7ea143424aaad724a296ef1aa [file] [log] [blame]
// Copyright 2018 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.
#include "base/optional.h"
#include "base/pending_task.h"
#include "base/task/sequence_manager/lazy_now.h"
namespace base {
namespace sequence_manager {
namespace internal {
// Interface to pass tasks to ThreadController.
class SequencedTaskSource {
// Returns the next task to run from this source or nullopt if
// there're no more tasks ready to run. If a task is returned,
// DidRunTask() must be invoked before the next call to TakeTask().
virtual Optional<PendingTask> TakeTask() = 0;
// Notifies this source that the task previously obtained
// from TakeTask() has been completed.
virtual void DidRunTask() = 0;
// Returns the delay till the next task or TimeDelta::Max()
// if there are no tasks left.
virtual TimeDelta DelayTillNextTask(LazyNow* lazy_now) = 0;
} // namespace internal
} // namespace sequence_manager
} // namespace base