pollevent.hh revision 2665:a124942bacb8 
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 <vector>
35#include <poll.h>
36#include "sim/root.hh"
37
38class Checkpoint;
39class PollQueue;
40
41class PollEvent
42{
43  private:
44    friend class PollQueue;
45
46  protected:
47    pollfd pfd;
48    PollQueue *queue;
49    bool enabled;
50
51  public:
52    PollEvent(int fd, int event);
53    virtual ~PollEvent();
54
55    void disable();
56    void enable();
57    virtual void process(int revent) = 0;
58
59    bool queued() { return queue != 0; }
60
61    virtual void serialize(std::ostream &os);
62    virtual void unserialize(Checkpoint *cp, const std::string &section);
63};
64
65class PollQueue
66{
67  private:
68    typedef std::vector<PollEvent *> eventvec_t;
69    eventvec_t events;
70
71    pollfd *poll_fds;
72    int max_size;
73    int num_fds;
74
75  public:
76    PollQueue();
77    ~PollQueue();
78
79    void copy();
80    void remove(PollEvent *event);
81    void schedule(PollEvent *event);
82    void service();
83
84  protected:
85    static bool handler;
86    static struct sigaction oldio;
87    static struct sigaction oldalrm;
88
89  public:
90    static void setupAsyncIO(int fd, bool set);
91    static void handleIO(int);
92    static void handleALRM(int);
93    static void removeHandler();
94    static void setupHandler();
95};
96
97extern PollQueue pollQueue;
98
99#endif // __POLLEVENT_H__
100