eventq.cc revision 56
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#include <assert.h> 30 31#include <iostream> 32#include <string> 33#include <sstream> 34#include <vector> 35 36#include "cpu/full_cpu/smt.hh" 37#include "base/misc.hh" 38 39#include "sim/eventq.hh" 40#include "base/trace.hh" 41#include "sim/universe.hh" 42 43using namespace std; 44 45const string Event::defaultName("event"); 46 47// 48// Main Event Queue 49// 50// Events on this queue are processed at the *beginning* of each 51// cycle, before the pipeline simulation is performed. 52// 53EventQueue mainEventQueue("Main Event Queue"); 54 55void 56EventQueue::insert(Event *event) 57{ 58 if (head == NULL || event->when() < head->when() || 59 (event->when() == head->when() && 60 event->priority() <= head->priority())) { 61 event->next = head; 62 head = event; 63 } else { 64 Event *prev = head; 65 Event *curr = head->next; 66 67 while (curr) { 68 if (event->when() <= curr->when() && 69 (event->when() < curr->when() || 70 event->priority() <= curr->priority())) 71 break; 72 73 prev = curr; 74 curr = curr->next; 75 } 76 77 event->next = curr; 78 prev->next = event; 79 } 80} 81 82void 83EventQueue::remove(Event *event) 84{ 85 if (head == NULL) 86 return; 87 88 if (head == event){ 89 head = event->next; 90 return; 91 } 92 93 Event *prev = head; 94 Event *curr = head->next; 95 while (curr && curr != event) { 96 prev = curr; 97 curr = curr->next; 98 } 99 100 if (curr == event) 101 prev->next = curr->next; 102} 103 104void 105EventQueue::serviceOne() 106{ 107 Event *event = head; 108 event->clearFlags(Event::Scheduled); 109 head = event->next; 110 111 // handle action 112 if (!event->squashed()) 113 event->process(); 114 else 115 event->clearFlags(Event::Squashed); 116 117 if (event->getFlags(Event::AutoDelete)) 118 delete event; 119} 120 121void 122EventQueue::nameChildren() 123{ 124 int j = 0; 125 126 Event *event = head; 127 while (event) { 128 stringstream stream; 129 ccprintf(stream, "%s.event%d", name(), j++); 130 event->setName(stream.str()); 131 132 event = event->next; 133 } 134} 135 136void 137EventQueue::serialize() 138{ 139 string objects = ""; 140 141 Event *event = head; 142 while (event) { 143 objects += event->name(); 144 objects += " "; 145 event->serialize(); 146 147 event = event->next; 148 } 149 nameOut("Serialized"); 150 paramOut("objects",objects); 151} 152 153void 154EventQueue::dump() 155{ 156 cprintf("============================================================\n"); 157 cprintf("EventQueue Dump (cycle %d)\n", curTick); 158 cprintf("------------------------------------------------------------\n"); 159 160 if (empty()) 161 cprintf("<No Events>\n"); 162 else { 163 Event *event = head; 164 while (event) { 165 event->dump(); 166 event = event->next; 167 } 168 } 169 170 cprintf("============================================================\n"); 171} 172 173 174const char * 175Event::description() 176{ 177 return "generic"; 178} 179 180#if TRACING_ON 181void 182Event::trace(const char *action) 183{ 184 // This DPRINTF is unconditional because calls to this function 185 // are protected by an 'if (DTRACE(Event))' in the inlined Event 186 // methods. 187 // 188 // This is just a default implementation for derived classes where 189 // it's not worth doing anything special. If you want to put a 190 // more informative message in the trace, override this method on 191 // the particular subclass where you have the information that 192 // needs to be printed. 193 DPRINTFN("%s event %s @ %d\n", description(), action, when()); 194} 195#endif 196 197void 198Event::dump() 199{ 200#if TRACING_ON 201 cprintf(" Created: %d\n", when_created); 202#endif 203 if (scheduled()) { 204#if TRACING_ON 205 cprintf(" Scheduled at %d\n", when_scheduled); 206#endif 207 cprintf(" Scheduled for %d\n", when()); 208 } 209 else { 210 cprintf(" Not Scheduled\n"); 211 } 212} 213