1/*
2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Nathan Binkert
29 */
30
31#ifndef __POLLEVENT_H__
32#define __POLLEVENT_H__
33
34#include <poll.h>
35
36#include <vector>
37
38#include "sim/core.hh"
39
40class Checkpoint;
41class PollQueue;
42
43class PollEvent : public Serializable
44{
45  private:
46    friend class PollQueue;
47
48  protected:
49    pollfd pfd;
50    PollQueue *queue;
51    bool enabled;
52
53  public:
54    PollEvent(int fd, int event);
55    virtual ~PollEvent();
56
57    void disable();
58    void enable();
59    virtual void process(int revent) = 0;
60
61    bool queued() { return queue != 0; }
62
63    void serialize(CheckpointOut &cp) const override;
64    void unserialize(CheckpointIn &cp) override;
65};
66
67class PollQueue
68{
69  private:
70    typedef std::vector<PollEvent *> eventvec_t;
71    eventvec_t events;
72
73    pollfd *poll_fds;
74    int max_size;
75    int num_fds;
76
77  public:
78    PollQueue();
79    ~PollQueue();
80
81    void copy();
82    void remove(PollEvent *event);
83    void schedule(PollEvent *event);
84    void service();
85
86  public:
87    static void setupAsyncIO(int fd, bool set);
88};
89
90extern PollQueue pollQueue;
91
92#endif // __POLLEVENT_H__
93