eventq.cc revision 1696
1/* 2 * Copyright (c) 2000-2003 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/root.hh" 42 43using namespace std; 44 45// 46// Main Event Queue 47// 48// Events on this queue are processed at the *beginning* of each 49// cycle, before the pipeline simulation is performed. 50// 51EventQueue mainEventQueue("MainEventQueue"); 52 53void 54EventQueue::insert(Event *event) 55{ 56 if (head == NULL || event->when() < head->when() || 57 (event->when() == head->when() && 58 event->priority() <= head->priority())) { 59 event->next = head; 60 head = event; 61 } else { 62 Event *prev = head; 63 Event *curr = head->next; 64 65 while (curr) { 66 if (event->when() <= curr->when() && 67 (event->when() < curr->when() || 68 event->priority() <= curr->priority())) 69 break; 70 71 prev = curr; 72 curr = curr->next; 73 } 74 75 event->next = curr; 76 prev->next = event; 77 } 78} 79 80void 81EventQueue::remove(Event *event) 82{ 83 if (head == NULL) 84 return; 85 86 if (head == event){ 87 head = event->next; 88 return; 89 } 90 91 Event *prev = head; 92 Event *curr = head->next; 93 while (curr && curr != event) { 94 prev = curr; 95 curr = curr->next; 96 } 97 98 if (curr == event) 99 prev->next = curr->next; 100} 101 102void 103EventQueue::serviceOne() 104{ 105 Event *event = head; 106 event->clearFlags(Event::Scheduled); 107 head = event->next; 108 109 // handle action 110 if (!event->squashed()) 111 event->process(); 112 else 113 event->clearFlags(Event::Squashed); 114 115 if (event->getFlags(Event::AutoDelete) && !event->scheduled()) 116 delete event; 117} 118 119 120void 121Event::serialize(std::ostream &os) 122{ 123 SERIALIZE_SCALAR(_when); 124 SERIALIZE_SCALAR(_priority); 125 SERIALIZE_ENUM(_flags); 126} 127 128 129void 130Event::unserialize(Checkpoint *cp, const string §ion) 131{ 132 if (scheduled()) 133 deschedule(); 134 135 UNSERIALIZE_SCALAR(_when); 136 UNSERIALIZE_SCALAR(_priority); 137 138 // need to see if original event was in a scheduled, unsquashed 139 // state, but don't want to restore those flags in the current 140 // object itself (since they aren't immediately true) 141 UNSERIALIZE_ENUM(_flags); 142 bool wasScheduled = (_flags & Scheduled) && !(_flags & Squashed); 143 _flags &= ~(Squashed | Scheduled); 144 145 if (wasScheduled) { 146 DPRINTF(Config, "rescheduling at %d\n", _when); 147 schedule(_when); 148 } 149} 150 151void 152EventQueue::serialize(ostream &os) 153{ 154 std::list<Event *> eventPtrs; 155 156 int numEvents = 0; 157 Event *event = head; 158 while (event) { 159 if (event->getFlags(Event::AutoSerialize)) { 160 eventPtrs.push_back(event); 161 paramOut(os, csprintf("event%d", numEvents++), event->name()); 162 } 163 event = event->next; 164 } 165 166 SERIALIZE_SCALAR(numEvents); 167 168 for (std::list<Event *>::iterator it=eventPtrs.begin(); 169 it != eventPtrs.end(); ++it) { 170 (*it)->nameOut(os); 171 (*it)->serialize(os); 172 } 173} 174 175void 176EventQueue::unserialize(Checkpoint *cp, const std::string §ion) 177{ 178 int numEvents; 179 UNSERIALIZE_SCALAR(numEvents); 180 181 std::string eventName; 182 for (int i = 0; i < numEvents; i++) { 183 // get the pointer value associated with the event 184 paramIn(cp, section, csprintf("event%d", i), eventName); 185 186 // create the event based on its pointer value 187 Serializable::create(cp, eventName); 188 } 189} 190 191void 192EventQueue::dump() 193{ 194 cprintf("============================================================\n"); 195 cprintf("EventQueue Dump (cycle %d)\n", curTick); 196 cprintf("------------------------------------------------------------\n"); 197 198 if (empty()) 199 cprintf("<No Events>\n"); 200 else { 201 Event *event = head; 202 while (event) { 203 event->dump(); 204 event = event->next; 205 } 206 } 207 208 cprintf("============================================================\n"); 209} 210 211extern "C" 212void 213dumpMainQueue() 214{ 215 mainEventQueue.dump(); 216} 217 218 219const char * 220Event::description() 221{ 222 return "generic"; 223} 224 225#if TRACING_ON 226void 227Event::trace(const char *action) 228{ 229 // This DPRINTF is unconditional because calls to this function 230 // are protected by an 'if (DTRACE(Event))' in the inlined Event 231 // methods. 232 // 233 // This is just a default implementation for derived classes where 234 // it's not worth doing anything special. If you want to put a 235 // more informative message in the trace, override this method on 236 // the particular subclass where you have the information that 237 // needs to be printed. 238 DPRINTFN("%s event %s @ %d\n", description(), action, when()); 239} 240#endif 241 242void 243Event::dump() 244{ 245 cprintf("Event (%s)\n", description()); 246 cprintf("Flags: %#x\n", _flags); 247#if TRACING_ON 248 cprintf("Created: %d\n", when_created); 249#endif 250 if (scheduled()) { 251#if TRACING_ON 252 cprintf("Scheduled at %d\n", when_scheduled); 253#endif 254 cprintf("Scheduled for %d, priority %d\n", when(), _priority); 255 } 256 else { 257 cprintf("Not Scheduled\n"); 258 } 259} 260