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 <poll.h> 35 36#include <vector> 37 38#include "sim/core.hh" 39 40class Checkpoint; 41class PollQueue; 42 43class PollEvent : public Serializable 44{ 45 private: 46 friend class PollQueue; 47 48 protected: 49 pollfd pfd; 50 PollQueue *queue; 51 bool enabled; 52 53 public: 54 PollEvent(int fd, int event); 55 virtual ~PollEvent(); 56 57 void disable(); 58 void enable(); 59 virtual void process(int revent) = 0; 60 61 bool queued() { return queue != 0; } 62 63 void serialize(CheckpointOut &cp) const override; 64 void unserialize(CheckpointIn &cp) override; 65}; 66 67class PollQueue 68{ 69 private: 70 typedef std::vector<PollEvent *> eventvec_t; 71 eventvec_t events; 72 73 pollfd *poll_fds; 74 int max_size; 75 int num_fds; 76 77 public: 78 PollQueue(); 79 ~PollQueue(); 80 81 void copy(); 82 void remove(PollEvent *event); 83 void schedule(PollEvent *event); 84 void service(); 85 86 public: 87 static void setupAsyncIO(int fd, bool set); 88}; 89 90extern PollQueue pollQueue; 91 92#endif // __POLLEVENT_H__ 93