pollevent.hh revision 252
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 Checkpoint; 37 38class PollEvent 39{ 40 private: 41 friend class PollQueue; 42 43 protected: 44 pollfd pfd; 45 PollQueue *queue; 46 bool enabled; 47 48 public: 49 PollEvent(int fd, int event); 50 virtual ~PollEvent(); 51 52 void disable(); 53 void enable(); 54 virtual void process(int revent) = 0; 55 56 bool queued() { return queue != 0; } 57 58 virtual void serialize(std::ostream &os); 59 virtual void unserialize(Checkpoint *cp, const std::string §ion); 60}; 61 62class PollQueue 63{ 64 private: 65 typedef std::vector<PollEvent *> eventvec_t; 66 eventvec_t events; 67 68 pollfd *poll_fds; 69 int max_size; 70 int num_fds; 71 72 public: 73 PollQueue(); 74 ~PollQueue(); 75 76 void copy(); 77 void remove(PollEvent *event); 78 void schedule(PollEvent *event); 79 void service(); 80 81 protected: 82 static bool handler; 83 static struct sigaction oldio; 84 static struct sigaction oldalrm; 85 86 public: 87 static void setupAsyncIO(int fd, bool set); 88 static void handleIO(int); 89 static void handleALRM(int); 90 static void removeHandler(); 91 static void setupHandler(); 92}; 93 94extern PollQueue pollQueue; 95 96#endif // __POLLEVENT_H__ 97