1/* 2 * Copyright 2018 Google, Inc. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: redistributions of source code must retain the above copyright 7 * notice, this list of conditions and the following disclaimer; 8 * redistributions in binary form must reproduce the above copyright 9 * notice, this list of conditions and the following disclaimer in the 10 * documentation and/or other materials provided with the distribution; 11 * neither the name of the copyright holders nor the names of its 12 * contributors may be used to endorse or promote products derived from 13 * this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 19 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * Authors: Gabe Black 28 */ 29 30#include "systemc/core/process.hh" 31 32#include "base/logging.hh" 33#include "systemc/core/event.hh" 34#include "systemc/core/scheduler.hh" 35 36namespace sc_gem5 37{ 38
|
39void
40Sensitivity::satisfy()
41{
42 warn_once("Ignoring suspended status for now.\n");
43 process->setDynamic(nullptr);
44 scheduler.ready(process);
45}
46
|
39SensitivityTimeout::SensitivityTimeout(Process *p, ::sc_core::sc_time t) : 40 Sensitivity(p), timeoutEvent(this), timeout(t) 41{ 42 Tick when = scheduler.eventQueue().getCurTick() + timeout.value(); 43 scheduler.eventQueue().schedule(&timeoutEvent, when); 44} 45 46SensitivityTimeout::~SensitivityTimeout() 47{ 48 if (timeoutEvent.scheduled()) 49 scheduler.eventQueue().deschedule(&timeoutEvent); 50} 51 52SensitivityEvent::SensitivityEvent( 53 Process *p, const ::sc_core::sc_event *e) : Sensitivity(p), event(e) 54{ 55 Event::getFromScEvent(event)->addSensitivity(this); 56} 57 58SensitivityEvent::~SensitivityEvent() 59{ 60 Event::getFromScEvent(event)->delSensitivity(this); 61} 62 63SensitivityEventAndList::SensitivityEventAndList( 64 Process *p, const ::sc_core::sc_event_and_list *list) : 65 Sensitivity(p), list(list), count(0) 66{ 67 for (auto e: list->events) 68 Event::getFromScEvent(e)->addSensitivity(this); 69} 70 71SensitivityEventAndList::~SensitivityEventAndList() 72{ 73 for (auto e: list->events) 74 Event::getFromScEvent(e)->delSensitivity(this); 75} 76 77void 78SensitivityEventAndList::notifyWork(Event *e) 79{ 80 e->delSensitivity(this); 81 count++; 82 if (count == list->events.size())
|
91 satisfy();
|
83 process->satisfySensitivity(this); |
84} 85 86SensitivityEventOrList::SensitivityEventOrList( 87 Process *p, const ::sc_core::sc_event_or_list *list) : 88 Sensitivity(p), list(list) 89{ 90 for (auto e: list->events) 91 Event::getFromScEvent(e)->addSensitivity(this); 92} 93 94SensitivityEventOrList::~SensitivityEventOrList() 95{ 96 for (auto e: list->events) 97 Event::getFromScEvent(e)->delSensitivity(this); 98} 99 100 101class UnwindExceptionReset : public ::sc_core::sc_unwind_exception 102{ 103 public: 104 const char *what() const throw() override { return "RESET"; } 105 bool is_reset() const override { return true; } 106}; 107 108class UnwindExceptionKill : public ::sc_core::sc_unwind_exception 109{ 110 public: 111 const char *what() const throw() override { return "KILL"; } 112 bool is_reset() const override { return false; } 113}; 114 115template <typename T> 116struct BuiltinExceptionWrapper : public ExceptionWrapperBase 117{ 118 public: 119 T t; 120 void throw_it() override { throw t; } 121}; 122 123BuiltinExceptionWrapper<UnwindExceptionReset> resetException; 124BuiltinExceptionWrapper<UnwindExceptionKill> killException; 125 126 127void 128Process::forEachKid(const std::function<void(Process *)> &work) 129{ 130 for (auto &kid: get_child_objects()) { 131 Process *p_kid = dynamic_cast<Process *>(kid); 132 if (p_kid) 133 work(p_kid); 134 } 135} 136 137void 138Process::suspend(bool inc_kids) 139{ 140 if (inc_kids) 141 forEachKid([](Process *p) { p->suspend(true); }); 142 143 if (!_suspended) { 144 _suspended = true;
|
153 //TODO Suspend this process.
|
145 _suspendedReady = false; |
146 } 147 148 if (procKind() != ::sc_core::SC_METHOD_PROC_ && 149 scheduler.current() == this) { 150 scheduler.yield(); 151 } 152} 153 154void 155Process::resume(bool inc_kids) 156{ 157 if (inc_kids) 158 forEachKid([](Process *p) { p->resume(true); }); 159 160 if (_suspended) { 161 _suspended = false;
|
170 //TODO Resume this process.
|
162 if (_suspendedReady) 163 ready(); 164 _suspendedReady = false; |
165 } 166} 167 168void 169Process::disable(bool inc_kids) 170{ 171 if (inc_kids) 172 forEachKid([](Process *p) { p->disable(true); }); 173 174 _disabled = true; 175} 176 177void 178Process::enable(bool inc_kids) 179{ 180 181 if (inc_kids) 182 forEachKid([](Process *p) { p->enable(true); }); 183 184 _disabled = false; 185} 186 187void 188Process::kill(bool inc_kids) 189{ 190 // Update our state. 191 _terminated = true; 192 _isUnwinding = true; 193 194 // Propogate the kill to our children no matter what happens to us. 195 if (inc_kids) 196 forEachKid([](Process *p) { p->kill(true); }); 197 198 // If we're in the middle of unwinding, ignore the kill request. 199 if (_isUnwinding) 200 return; 201 202 // Inject the kill exception into this process. 203 injectException(killException); 204 205 _terminatedEvent.notify(); 206} 207 208void 209Process::reset(bool inc_kids) 210{ 211 // Update our state. 212 _isUnwinding = true; 213 214 // Propogate the reset to our children no matter what happens to us. 215 if (inc_kids) 216 forEachKid([](Process *p) { p->reset(true); }); 217 218 // If we're in the middle of unwinding, ignore the reset request. 219 if (_isUnwinding) 220 return; 221 222 // Inject the reset exception into this process. 223 injectException(resetException); 224 225 _resetEvent.notify(); 226} 227 228void 229Process::throw_it(ExceptionWrapperBase &exc, bool inc_kids) 230{ 231 if (inc_kids) 232 forEachKid([&exc](Process *p) { p->throw_it(exc, true); }); 233} 234 235void 236Process::injectException(ExceptionWrapperBase &exc) 237{ 238 excWrapper = &exc; 239 // Let this process preempt us. 240}; 241 242void 243Process::syncResetOn(bool inc_kids) 244{ 245 if (inc_kids) 246 forEachKid([](Process *p) { p->syncResetOn(true); }); 247 248 _syncReset = true; 249} 250 251void 252Process::syncResetOff(bool inc_kids) 253{ 254 if (inc_kids) 255 forEachKid([](Process *p) { p->syncResetOff(true); }); 256 257 _syncReset = false; 258} 259 260void 261Process::dontInitialize() 262{ 263 scheduler.dontInitialize(this); 264} 265 266void 267Process::finalize() 268{ 269 for (auto &s: pendingStaticSensitivities) { 270 s->finalize(staticSensitivities); 271 delete s; 272 s = nullptr; 273 } 274 pendingStaticSensitivities.clear(); 275}; 276 277void 278Process::run() 279{ 280 _running = true; 281 bool reset; 282 do { 283 reset = false; 284 try { 285 func->call(); 286 } catch(::sc_core::sc_unwind_exception exc) { 287 reset = exc.is_reset(); 288 } 289 } while (reset); 290 _running = false; 291} 292 293void 294Process::addStatic(PendingSensitivity *s) 295{ 296 pendingStaticSensitivities.push_back(s); 297} 298 299void 300Process::setDynamic(Sensitivity *s) 301{ 302 delete dynamicSensitivity; 303 dynamicSensitivity = s; 304} 305
|
306void 307Process::satisfySensitivity(Sensitivity *s) 308{ 309 // If there's a dynamic sensitivity and this wasn't it, ignore. 310 if (dynamicSensitivity && dynamicSensitivity != s) 311 return; 312 313 setDynamic(nullptr); 314 ready(); 315} 316 317void 318Process::ready() 319{ 320 if (suspended()) 321 _suspendedReady = true; 322 else 323 scheduler.ready(this); 324} 325 |
326Process::Process(const char *name, ProcessFuncWrapper *func, bool _dynamic) : 327 ::sc_core::sc_object(name), excWrapper(nullptr), func(func), 328 _running(false), _dynamic(_dynamic), _isUnwinding(false), 329 _terminated(false), _suspended(false), _disabled(false), 330 _syncReset(false), refCount(0), stackSize(::Fiber::DefaultStackSize), 331 dynamicSensitivity(nullptr) 332{ 333 _newest = this; 334 if (_dynamic) 335 finalize(); 336 else 337 scheduler.reg(this); 338} 339 340Process *Process::_newest; 341 342void 343throw_it_wrapper(Process *p, ExceptionWrapperBase &exc, bool inc_kids) 344{ 345 p->throw_it(exc, inc_kids); 346} 347 348} // namespace sc_gem5
|