pollevent.hh revision 2632:1bb2f91485ea 
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
29#ifndef __POLLEVENT_H__
30#define __POLLEVENT_H__
31
32#include <vector>
33#include <poll.h>
34#include "sim/root.hh"
35
36class Checkpoint;
37class PollQueue;
38
39class PollEvent
40{
41  private:
42    friend class PollQueue;
43
44  protected:
45    pollfd pfd;
46    PollQueue *queue;
47    bool enabled;
48
49  public:
50    PollEvent(int fd, int event);
51    virtual ~PollEvent();
52
53    void disable();
54    void enable();
55    virtual void process(int revent) = 0;
56
57    bool queued() { return queue != 0; }
58
59    virtual void serialize(std::ostream &os);
60    virtual void unserialize(Checkpoint *cp, const std::string &section);
61};
62
63class PollQueue
64{
65  private:
66    typedef std::vector<PollEvent *> eventvec_t;
67    eventvec_t events;
68
69    pollfd *poll_fds;
70    int max_size;
71    int num_fds;
72
73  public:
74    PollQueue();
75    ~PollQueue();
76
77    void copy();
78    void remove(PollEvent *event);
79    void schedule(PollEvent *event);
80    void service();
81
82  protected:
83    static bool handler;
84    static struct sigaction oldio;
85    static struct sigaction oldalrm;
86
87  public:
88    static void setupAsyncIO(int fd, bool set);
89    static void handleIO(int);
90    static void handleALRM(int);
91    static void removeHandler();
92    static void setupHandler();
93};
94
95extern PollQueue pollQueue;
96
97#endif // __POLLEVENT_H__
98