ceph/src/msg/QueueStrategy.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2014 CohortFS, LLC
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15
  16 #ifndef QUEUE_STRATEGY_H
  17 #define QUEUE_STRATEGY_H
  18
  19 #include <vector>
  20 #include <memory>
  21 #include <boost/intrusive/list.hpp>
  22 #include "DispatchStrategy.h"
  23 #include "msg/Messenger.h"
  24
  25 namespace bi = boost::intrusive;
  26
  27 class QueueStrategy : public DispatchStrategy {
  28   Mutex lock;
  29   const int n_threads;
  30   bool stop;
  31
  32   Message::Queue mqueue;
  33
  34   class QSThread : public Thread {
  35   public:
  36     bi::list_member_hook<> thread_q;
  37     QueueStrategy *dq;
  38     Cond cond;
  39     explicit QSThread(QueueStrategy *dq) : thread_q(), dq(dq), cond() {}
  40     void* entry() {
  41       dq->entry(this);
  42       return NULL;
  43     }
  44
  45     typedef bi::list< QSThread,
  46                       bi::member_hook< QSThread,
  47                                        bi::list_member_hook<>,
  48                                        &QSThread::thread_q > > Queue;
  49   };
  50
  51   std::vector<std::unique_ptr<QSThread>> threads; //< all threads
  52   QSThread::Queue disp_threads; //< waiting threads
  53
  54 public:
  55   explicit QueueStrategy(int n_threads);
  56   void ds_dispatch(Message *m) override;
  57   void shutdown() override;
  58   void start() override;
  59   void wait() override;
  60   void entry(QSThread *thrd);
  61   virtual ~QueueStrategy() {}
  62 };
  63 #endif /* QUEUE_STRATEGY_H */