ceph/src/msg/async/EventSelect.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 UnitedStack <haomai@unitedstack.com>
   7  *
   8  * Author: Haomai Wang <haomaiwang@gmail.com>
   9  *
  10  * This is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License version 2.1, as published by the Free Software
  13  * Foundation.  See file COPYING.
  14  *
  15  */
  16
  17 #ifndef CEPH_MSG_EVENTSELECT_H
  18 #define CEPH_MSG_EVENTSELECT_H
  19
  20 #include "Event.h"
  21
  22 class SelectDriver : public EventDriver {
  23   fd_set rfds, wfds;
  24   /* We need to have a copy of the fd sets as it's not safe to reuse
  25    * FD sets after select(). */
  26   fd_set _rfds, _wfds;
  27   int max_fd;
  28   CephContext *cct;
  29
  30  public:
  31   explicit SelectDriver(CephContext *c): max_fd(0), cct(c) {}
  32   ~SelectDriver() override {}
  33
  34   int init(EventCenter *c, int nevent) override;
  35   int add_event(int fd, int cur_mask, int add_mask) override;
  36   int del_event(int fd, int cur_mask, int del_mask) override;
  37   int resize_events(int newsize) override;
  38   int event_wait(vector<FiredFileEvent> &fired_events,
  39                  struct timeval *tp) override;
  40 };
  41
  42 #endif