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