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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 a base::TaskRunner (typically obtained from
- // base/task/thread_pool.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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