pollevent.hh revision 251 
1/*
2 * Copyright (c) 2003 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/universe.hh"
35
36class PollEvent
37{
38  private:
39    friend class PollQueue;
40
41  protected:
42    pollfd pfd;
43    PollQueue *queue;
44    bool enabled;
45
46  public:
47    PollEvent(int fd, int event);
48    virtual ~PollEvent();
49
50    void disable();
51    void enable();
52    virtual void process(int revent) = 0;
53
54    bool queued() { return queue != 0; }
55};
56
57class PollQueue
58{
59  private:
60    typedef std::vector<PollEvent *> eventvec_t;
61    eventvec_t events;
62
63    pollfd *poll_fds;
64    int max_size;
65    int num_fds;
66
67  public:
68    PollQueue();
69    ~PollQueue();
70
71    void copy();
72    void remove(PollEvent *event);
73    void schedule(PollEvent *event);
74    void service();
75
76  protected:
77    static bool handler;
78    static struct sigaction oldio;
79    static struct sigaction oldalrm;
80
81  public:
82    static void setupAsyncIO(int fd, bool set);
83    static void handleIO(int);
84    static void handleALRM(int);
85    static void removeHandler();
86    static void setupHandler();
87};
88
89extern PollQueue pollQueue;
90
91#endif // __POLLEVENT_H__
92