eventq.cc revision 2665
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 * Authors: Steve Reinhardt 29 * Nathan Binkert 30 * Steve Raasch 31 */ 32 33#include <assert.h> 34 35#include <iostream> 36#include <string> 37#include <vector> 38 39#include "cpu/smt.hh" 40#include "base/misc.hh" 41 42#include "sim/eventq.hh" 43#include "base/trace.hh" 44#include "sim/root.hh" 45 46using namespace std; 47 48// 49// Main Event Queue 50// 51// Events on this queue are processed at the *beginning* of each 52// cycle, before the pipeline simulation is performed. 53// 54EventQueue mainEventQueue("MainEventQueue"); 55 56void 57EventQueue::insert(Event *event) 58{ 59 if (head == NULL || event->when() < head->when() || 60 (event->when() == head->when() && 61 event->priority() <= head->priority())) { 62 event->next = head; 63 head = event; 64 } else { 65 Event *prev = head; 66 Event *curr = head->next; 67 68 while (curr) { 69 if (event->when() <= curr->when() && 70 (event->when() < curr->when() || 71 event->priority() <= curr->priority())) 72 break; 73 74 prev = curr; 75 curr = curr->next; 76 } 77 78 event->next = curr; 79 prev->next = event; 80 } 81} 82 83void 84EventQueue::remove(Event *event) 85{ 86 if (head == NULL) 87 return; 88 89 if (head == event){ 90 head = event->next; 91 return; 92 } 93 94 Event *prev = head; 95 Event *curr = head->next; 96 while (curr && curr != event) { 97 prev = curr; 98 curr = curr->next; 99 } 100 101 if (curr == event) 102 prev->next = curr->next; 103} 104 105void 106EventQueue::serviceOne() 107{ 108 Event *event = head; 109 event->clearFlags(Event::Scheduled); 110 head = event->next; 111 112 // handle action 113 if (!event->squashed()) 114 event->process(); 115 else 116 event->clearFlags(Event::Squashed); 117 118 if (event->getFlags(Event::AutoDelete) && !event->scheduled()) 119 delete event; 120} 121 122 123void 124Event::serialize(std::ostream &os) 125{ 126 SERIALIZE_SCALAR(_when); 127 SERIALIZE_SCALAR(_priority); 128 SERIALIZE_ENUM(_flags); 129} 130 131 132void 133Event::unserialize(Checkpoint *cp, const string §ion) 134{ 135 if (scheduled()) 136 deschedule(); 137 138 UNSERIALIZE_SCALAR(_when); 139 UNSERIALIZE_SCALAR(_priority); 140 141 // need to see if original event was in a scheduled, unsquashed 142 // state, but don't want to restore those flags in the current 143 // object itself (since they aren't immediately true) 144 UNSERIALIZE_ENUM(_flags); 145 bool wasScheduled = (_flags & Scheduled) && !(_flags & Squashed); 146 _flags &= ~(Squashed | Scheduled); 147 148 if (wasScheduled) { 149 DPRINTF(Config, "rescheduling at %d\n", _when); 150 schedule(_when); 151 } 152} 153 154void 155EventQueue::serialize(ostream &os) 156{ 157 std::list<Event *> eventPtrs; 158 159 int numEvents = 0; 160 Event *event = head; 161 while (event) { 162 if (event->getFlags(Event::AutoSerialize)) { 163 eventPtrs.push_back(event); 164 paramOut(os, csprintf("event%d", numEvents++), event->name()); 165 } 166 event = event->next; 167 } 168 169 SERIALIZE_SCALAR(numEvents); 170 171 for (std::list<Event *>::iterator it=eventPtrs.begin(); 172 it != eventPtrs.end(); ++it) { 173 (*it)->nameOut(os); 174 (*it)->serialize(os); 175 } 176} 177 178void 179EventQueue::unserialize(Checkpoint *cp, const std::string §ion) 180{ 181 int numEvents; 182 UNSERIALIZE_SCALAR(numEvents); 183 184 std::string eventName; 185 for (int i = 0; i < numEvents; i++) { 186 // get the pointer value associated with the event 187 paramIn(cp, section, csprintf("event%d", i), eventName); 188 189 // create the event based on its pointer value 190 Serializable::create(cp, eventName); 191 } 192} 193 194void 195EventQueue::dump() 196{ 197 cprintf("============================================================\n"); 198 cprintf("EventQueue Dump (cycle %d)\n", curTick); 199 cprintf("------------------------------------------------------------\n"); 200 201 if (empty()) 202 cprintf("<No Events>\n"); 203 else { 204 Event *event = head; 205 while (event) { 206 event->dump(); 207 event = event->next; 208 } 209 } 210 211 cprintf("============================================================\n"); 212} 213 214extern "C" 215void 216dumpMainQueue() 217{ 218 mainEventQueue.dump(); 219} 220 221 222const char * 223Event::description() 224{ 225 return "generic"; 226} 227 228#if TRACING_ON 229void 230Event::trace(const char *action) 231{ 232 // This DPRINTF is unconditional because calls to this function 233 // are protected by an 'if (DTRACE(Event))' in the inlined Event 234 // methods. 235 // 236 // This is just a default implementation for derived classes where 237 // it's not worth doing anything special. If you want to put a 238 // more informative message in the trace, override this method on 239 // the particular subclass where you have the information that 240 // needs to be printed. 241 DPRINTFN("%s event %s @ %d\n", description(), action, when()); 242} 243#endif 244 245void 246Event::dump() 247{ 248 cprintf("Event (%s)\n", description()); 249 cprintf("Flags: %#x\n", _flags); 250#if TRACING_ON 251 cprintf("Created: %d\n", when_created); 252#endif 253 if (scheduled()) { 254#if TRACING_ON 255 cprintf("Scheduled at %d\n", when_scheduled); 256#endif 257 cprintf("Scheduled for %d, priority %d\n", when(), _priority); 258 } 259 else { 260 cprintf("Not Scheduled\n"); 261 } 262} 263