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// Copyright (c) 2011 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.
// This file contains the implementation for TaskRunner::PostTaskAndReply.
#ifndef BASE_THREADING_POST_TASK_AND_REPLY_IMPL_H_
#define BASE_THREADING_POST_TASK_AND_REPLY_IMPL_H_
#include "base/base_export.h"
#include "base/callback.h"
#include "base/location.h"
namespace base {
namespace internal {
// Inherit from this in a class that implements PostTask to send a task to a
// custom execution context.
//
// If you're looking for a concrete implementation of PostTaskAndReply, you
// probably want base::TaskRunner or base/task/post_task.h
class BASE_EXPORT PostTaskAndReplyImpl {
public:
virtual ~PostTaskAndReplyImpl() = default;
// Posts |task| by calling PostTask(). On completion, posts |reply| to the
// origin sequence. Can only be called when
// SequencedTaskRunnerHandle::IsSet(). Each callback is deleted synchronously
// after running, or scheduled for asynchronous deletion on the origin
// sequence if it can't run (e.g. if a TaskRunner skips it on shutdown). See
// SequencedTaskRunner::DeleteSoon() for when objects scheduled for
// asynchronous deletion can be leaked. Note: All //base task posting APIs
// require callbacks to support deletion on the posting sequence if they can't
// be scheduled.
bool PostTaskAndReply(const Location& from_here,
OnceClosure task,
OnceClosure reply);
private:
virtual bool PostTask(const Location& from_here, OnceClosure task) = 0;
};
} // namespace internal
} // namespace base
#endif // BASE_THREADING_POST_TASK_AND_REPLY_IMPL_H_
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