pollevent.hh revision 4167
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/core.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 §ion); 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