base/threading/post_task_and_reply_impl.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This file contains the implementation shared by
   6 // TaskRunner::PostTaskAndReply and WorkerPool::PostTaskAndReply.
   7
   8 #ifndef BASE_THREADING_POST_TASK_AND_REPLY_IMPL_H_
   9 #define BASE_THREADING_POST_TASK_AND_REPLY_IMPL_H_
  10
  11 #include "base/callback_forward.h"
  12 #include "base/location.h"
  13
  14 namespace base {
  15 namespace internal {
  16
  17 // Inherit from this in a class that implements PostTask appropriately
  18 // for sending to a destination thread.
  19 //
  20 // Note that 'reply' will always get posted back to your current
  21 // MessageLoop.
  22 //
  23 // If you're looking for a concrete implementation of
  24 // PostTaskAndReply, you probably want base::SingleThreadTaskRunner, or you
  25 // may want base::WorkerPool.
  26 class PostTaskAndReplyImpl {
  27  public:
  28   virtual ~PostTaskAndReplyImpl() = default;
  29
  30   // Implementation for TaskRunner::PostTaskAndReply and
  31   // WorkerPool::PostTaskAndReply.
  32   bool PostTaskAndReply(const tracked_objects::Location& from_here,
  33                         const Closure& task,
  34                         const Closure& reply);
  35
  36  private:
  37   virtual bool PostTask(const tracked_objects::Location& from_here,
  38                         const Closure& task) = 0;
  39 };
  40
  41 }  // namespace internal
  42 }  // namespace base
  43
  44 #endif  // BASE_THREADING_POST_TASK_AND_REPLY_IMPL_H_