pollevent.hh revision 1872
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 §ion); 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