pollevent.hh

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/*
 * Copyright (c) 2002-2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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#ifndef __BASE_POLLEVENT_HH__
#define __BASE_POLLEVENT_HH__
 
#include <poll.h>
 
#include <vector>
 
#include "sim/serialize.hh"
 
namespace gem5
{
 
class PollQueue;
 
class PollEvent : public Serializable
{
  private:
    friend class PollQueue;
 
  protected:
    pollfd pfd;
    PollQueue *queue;
    bool enabled;
 
  public:
    PollEvent(int fd, int event);
    virtual ~PollEvent();
 
    void disable();
    void enable();
    virtual void process(int revent) = 0; // end of api_poll_event
 
    bool queued() { return queue != 0; }
 
    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;
};
 
class PollQueue
{
  private:
    typedef std::vector<PollEvent *> eventvec_t;
    eventvec_t events;
 
    pollfd *poll_fds;
    int max_size;
    int num_fds;
 
  public:
    PollQueue();
    ~PollQueue();
 
    void copy();
    void remove(PollEvent *event);
    void schedule(PollEvent *event);
    void service(); // end of api_poll_queue
 
 
  public:
    static void setupAsyncIO(int fd, bool set);
};
 
extern PollQueue pollQueue;
 
} // namespace gem5
 
#endif // __BASE_POLLEVENT_HH__