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

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42 eq(nullptr), readyEvent(this, false, ReadyPriority),
43 pauseEvent(this, false, PausePriority),
44 stopEvent(this, false, StopPriority),
45 scMain(nullptr),
46 starvationEvent(this, false, StarvationPriority),
47 _started(false), _paused(false), _stopped(false), _stopNow(false),
48 maxTickEvent(this, false, MaxTickPriority),
49 _numCycles(0), _changeStamp(0), _current(nullptr), initDone(false),
50 runOnce(false), readyList(nullptr)
51{}
52
53Scheduler::~Scheduler()
54{
55 // Clear out everything that belongs to us to make sure nobody tries to
56 // clear themselves out after the scheduler goes away.
57 clear();
58}

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85 if (maxTickEvent.scheduled())
86 deschedule(&maxTickEvent);
87
88 Process *p;
89 while ((p = toFinalize.getNext()))
90 p->popListNode();
91 while ((p = initList.getNext()))
92 p->popListNode();
93 while ((p = readyListMethods.getNext()))
94 p->popListNode();
95 while ((p = readyListThreads.getNext()))
96 p->popListNode();
97
98 Channel *c;
99 while ((c = updateList.getNext()))
100 c->popListNode();
101}
102
103void
104Scheduler::initPhase()

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159 // off the list of processes to be initialized/marked ready.
160 toFinalize.pushLast(p);
161 }
162}
163
164void
165Scheduler::yield()
166{
167 // Pull a process from the active list.
168 _current = readyList->getNext();
169 if (!_current) {
170 // There are no more processes, so return control to evaluate.
171 Fiber::primaryFiber()->run();
172 } else {
173 _current->popListNode();
174 // Switch to whatever Fiber is supposed to run this process. All
175 // Fibers which aren't running should be parked at this line.
176 _current->fiber()->run();

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190}
191
192void
193Scheduler::ready(Process *p)
194{
195 if (_stopNow)
196 return;
197
198 if (p->procKind() == ::sc_core::SC_METHOD_PROC_)
199 readyListMethods.pushLast(p);
200 else
201 readyListThreads.pushLast(p);
202
203 scheduleReadyEvent();
204}
205
206void
207Scheduler::resume(Process *p)
208{
209 if (initDone)
210 ready(p);
211 else
212 initList.pushLast(p);
213}
214
215bool
216listContains(ListNode *list, ListNode *target)
217{
218 ListNode *n = list->nextListNode;
219 while (n != list)
220 if (n == target)
221 return true;
222 return false;
223}
224
225bool
226Scheduler::suspend(Process *p)
227{
228 bool was_ready;
229 if (initDone) {
230 // After initialization, the only list we can be on is the ready list.
231 was_ready = (p->nextListNode != nullptr);
232 p->popListNode();
233 } else {
234 // Check the ready lists to see if we find this process.
235 was_ready = listContains(&readyListMethods, p) ||
236 listContains(&readyListThreads, p);
237 if (was_ready)
238 toFinalize.pushLast(p);
239 }
240 return was_ready;
241}
242
243void
244Scheduler::requestUpdate(Channel *c)
245{
246 updateList.pushLast(c);
247 scheduleReadyEvent();
248}

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266 if (readyEvent.scheduled())
267 deschedule(&readyEvent);
268 }
269}
270
271void
272Scheduler::runReady()
273{
274 bool empty = readyListMethods.empty() && readyListThreads.empty();
275 lastReadyTick = getCurTick();
276
277 // The evaluation phase.
278 do {
279 // We run methods and threads in two seperate passes to emulate how
280 // Accellera orders things, but without having to scan through a
281 // unified list to find the next process of the correct type.
282 readyList = &readyListMethods;
283 while (!readyListMethods.empty())
284 yield();
285
286 readyList = &readyListThreads;
287 while (!readyListThreads.empty())
288 yield();
289
290 // We already know that readyListThreads is empty at this point.
291 } while (!readyListMethods.empty());
292
293 if (!empty) {
294 _numCycles++;
295 _changeStamp++;
296 }
297
298 if (_stopNow)
299 return;
300

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