eventq.cc revision 2632:1bb2f91485ea
1/* 2 * Copyright (c) 2000-2005 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#include <assert.h> 30 31#include <iostream> 32#include <string> 33#include <vector> 34 35#include "cpu/smt.hh" 36#include "base/misc.hh" 37 38#include "sim/eventq.hh" 39#include "base/trace.hh" 40#include "sim/root.hh" 41 42using namespace std; 43 44// 45// Main Event Queue 46// 47// Events on this queue are processed at the *beginning* of each 48// cycle, before the pipeline simulation is performed. 49// 50EventQueue mainEventQueue("MainEventQueue"); 51 52void 53EventQueue::insert(Event *event) 54{ 55 if (head == NULL || event->when() < head->when() || 56 (event->when() == head->when() && 57 event->priority() <= head->priority())) { 58 event->next = head; 59 head = event; 60 } else { 61 Event *prev = head; 62 Event *curr = head->next; 63 64 while (curr) { 65 if (event->when() <= curr->when() && 66 (event->when() < curr->when() || 67 event->priority() <= curr->priority())) 68 break; 69 70 prev = curr; 71 curr = curr->next; 72 } 73 74 event->next = curr; 75 prev->next = event; 76 } 77} 78 79void 80EventQueue::remove(Event *event) 81{ 82 if (head == NULL) 83 return; 84 85 if (head == event){ 86 head = event->next; 87 return; 88 } 89 90 Event *prev = head; 91 Event *curr = head->next; 92 while (curr && curr != event) { 93 prev = curr; 94 curr = curr->next; 95 } 96 97 if (curr == event) 98 prev->next = curr->next; 99} 100 101void 102EventQueue::serviceOne() 103{ 104 Event *event = head; 105 event->clearFlags(Event::Scheduled); 106 head = event->next; 107 108 // handle action 109 if (!event->squashed()) 110 event->process(); 111 else 112 event->clearFlags(Event::Squashed); 113 114 if (event->getFlags(Event::AutoDelete) && !event->scheduled()) 115 delete event; 116} 117 118 119void 120Event::serialize(std::ostream &os) 121{ 122 SERIALIZE_SCALAR(_when); 123 SERIALIZE_SCALAR(_priority); 124 SERIALIZE_ENUM(_flags); 125} 126 127 128void 129Event::unserialize(Checkpoint *cp, const string §ion) 130{ 131 if (scheduled()) 132 deschedule(); 133 134 UNSERIALIZE_SCALAR(_when); 135 UNSERIALIZE_SCALAR(_priority); 136 137 // need to see if original event was in a scheduled, unsquashed 138 // state, but don't want to restore those flags in the current 139 // object itself (since they aren't immediately true) 140 UNSERIALIZE_ENUM(_flags); 141 bool wasScheduled = (_flags & Scheduled) && !(_flags & Squashed); 142 _flags &= ~(Squashed | Scheduled); 143 144 if (wasScheduled) { 145 DPRINTF(Config, "rescheduling at %d\n", _when); 146 schedule(_when); 147 } 148} 149 150void 151EventQueue::serialize(ostream &os) 152{ 153 std::list<Event *> eventPtrs; 154 155 int numEvents = 0; 156 Event *event = head; 157 while (event) { 158 if (event->getFlags(Event::AutoSerialize)) { 159 eventPtrs.push_back(event); 160 paramOut(os, csprintf("event%d", numEvents++), event->name()); 161 } 162 event = event->next; 163 } 164 165 SERIALIZE_SCALAR(numEvents); 166 167 for (std::list<Event *>::iterator it=eventPtrs.begin(); 168 it != eventPtrs.end(); ++it) { 169 (*it)->nameOut(os); 170 (*it)->serialize(os); 171 } 172} 173 174void 175EventQueue::unserialize(Checkpoint *cp, const std::string §ion) 176{ 177 int numEvents; 178 UNSERIALIZE_SCALAR(numEvents); 179 180 std::string eventName; 181 for (int i = 0; i < numEvents; i++) { 182 // get the pointer value associated with the event 183 paramIn(cp, section, csprintf("event%d", i), eventName); 184 185 // create the event based on its pointer value 186 Serializable::create(cp, eventName); 187 } 188} 189 190void 191EventQueue::dump() 192{ 193 cprintf("============================================================\n"); 194 cprintf("EventQueue Dump (cycle %d)\n", curTick); 195 cprintf("------------------------------------------------------------\n"); 196 197 if (empty()) 198 cprintf("<No Events>\n"); 199 else { 200 Event *event = head; 201 while (event) { 202 event->dump(); 203 event = event->next; 204 } 205 } 206 207 cprintf("============================================================\n"); 208} 209 210extern "C" 211void 212dumpMainQueue() 213{ 214 mainEventQueue.dump(); 215} 216 217 218const char * 219Event::description() 220{ 221 return "generic"; 222} 223 224#if TRACING_ON 225void 226Event::trace(const char *action) 227{ 228 // This DPRINTF is unconditional because calls to this function 229 // are protected by an 'if (DTRACE(Event))' in the inlined Event 230 // methods. 231 // 232 // This is just a default implementation for derived classes where 233 // it's not worth doing anything special. If you want to put a 234 // more informative message in the trace, override this method on 235 // the particular subclass where you have the information that 236 // needs to be printed. 237 DPRINTFN("%s event %s @ %d\n", description(), action, when()); 238} 239#endif 240 241void 242Event::dump() 243{ 244 cprintf("Event (%s)\n", description()); 245 cprintf("Flags: %#x\n", _flags); 246#if TRACING_ON 247 cprintf("Created: %d\n", when_created); 248#endif 249 if (scheduled()) { 250#if TRACING_ON 251 cprintf("Scheduled at %d\n", when_scheduled); 252#endif 253 cprintf("Scheduled for %d, priority %d\n", when(), _priority); 254 } 255 else { 256 cprintf("Not Scheduled\n"); 257 } 258} 259